Page 1
Amiga
A500_R6
Rev.1.37 (02.09.2012)
Page 2
VCC
Left Right Audio (Audio)LEFT/RIGHT 4
Expansion RAS Select 3
BLOB
NTSC/PAL Selection
2
BLOB
JP3
JP4
Keyboard Reset
JP2
JP1
BLOB
2
Memory Addr. C0 vs 08
BLOB
7
DESCRIPTION
REF TYPE
PAGE
Mem. Exp. Main-Board
CNX RA-56H
3
Expansion Connector 7
EDGE86P1
Keyboard Connector
CN13 SIL-8
6
Internal Floppy Signal 7
DIL-34
Internal Floppy Power
8
SIL-4
CN11
CN12
Video Output 5
DB23P
Composite Video
5
RCA-J
CN9
CN10
Parallel Printer Port
CN8
CN7
SQ DIN
8
Power Supply Connector
DB25S
6
External Floppy 7
DB23S
RS232 Serial Port
6
DB25P
CN5
CN6
Right Audio Output
CN4
CN3
RCA-J
4
Left Audio Output
RCA-J
4
Mouse/Joystick 1 2
DB9P
Mouse/Joystick 2
2
DB9P
CN1
CN2
DESCRIPTION PAGE
TYPEREF
HY1 asst
5
Video Hybrid
TTL 28.63636 MHz NTSC
X1
OSC
alt
TTL 28.37512 MHz PAL
OSC
2
DRAM 1Mx1, 150 nS
U20-23
U16-19
asst
9
DRAM 1Mx1, 150 nS
asst
3
EIA Line Receiver
U42
U39
NE555
7
Timer
1489
4
BiMOS Op-Amp
U38 1488
4
EIA Line Driver
TL084
alt
U14 LF347
4
BiMOS Op-Amp
ROM 128Kx16, 200 nS
U7-8
U6
8520
6
Amiga VIA, 1 MHz
asst
3
Denise HR
U5 5719
2,4
Gary
8373
alt
Paula
U4
U3
8362
5
Denise
8364
4
Fat Agnus - PAL
8372
alt
Agnus HR
8371
alt
68000 Processor
U2
U1
8370
2
Fat Agnus - NTSC
68000
2
DESCRIPTION
REF CHIP
PAGE
04/27/89
1
PCB Revision 6a/7 Production GRR
03/03/89Add E Clock Termination880283
DATEDESCRIPTIONECO NUMBER
312007
312006
C/A500
09/09/88
GRR
A PAGE FOR SHARON AND VONNIE TO USE
G. Robbins
C/A500 Main Board
C 1
8
1
APPR:
ENGR:
CHKD:
DATEBY:DRAWN
ONUSED ASSYNEXT
OFSHEETSCALE
SIZE
Commodore
REV
04/27/89
"Rock Lobster"
PATH:
/USER/B52_LIB/ROCK_LOBSTER_REV6.X SHEET1
ECO Log
Revision History
ATTEMPT TO FORCE NODE NUMBERS VIA SEQUENCE
Key Components
Jumpers and Stuff
Connectors
Signal Glossary
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
+12V
-12V
+VID
AUDIO EXP
+5X
+12X
Expansion/Tick Option
JP8
JP7
BLOB
6
Light Pen Port Select
BLOB
3/6
Genlock Clock Select 2
BLOB
7MHz Clock Option
7
BLOB
JP5
JP6
TTL vs RS170 Comp Sync 5
BLOBJP11
JP10 BLOB
4
RS232 Audio I/O Cutout
see schematic 312511-01
-
For older Revision 3/5 boards
REV DATEDESCRIPTION MANAGER
APRVL
Upper / Lower Data Strobes (68000) 2,7LDS/UDS
LED Power On LED / Audio Filter Disable 4,6
Keyboard Data (Keyboard)
6Keyboard Reset (Keyboard)KBRESETKBRESET
KBDATA 6
Interrupt Priority Level (68000) 2,4,7IPL[2:0]
KBCLOCK Keyboard Clock (Keyboard) 6
Interrupt Request (Chips)
6,7I/O ResetIORESET
INT[2,3,6] 2,4,6,7
Horizontal Sync (Video)
6,7Index Pulse (Floppy)INDEX
HSYNC 2,5,6
Fire Button 0/1 (Joysticks) 2,5,6FIRE0/1
HLT Processor Halt (68000) 2,7
Expansion Present / RTC Tick
2,7Function Code (68000)FC[2:0]
EXTICK 2,3
Data Terminal Ready (RS232 Port) 6DTR
E Peripheral Enable Clock (68000) 2,6,7
Data Set Ready (RS232 Port) 6DSR
DTACK Data Transfer Acknowledge (68000) 2,3,7
DRAM Address Bus (DRAM)
2,3,4,5DRAM Data Bus (DRAM)DRD[15:0]
DRA[8:0] 2,3
Disk Write Enable (Floppy) 4,7DKWE
DMAL Chip DMA Request Line (Chips) 2,4
Disk Read Data (Floppy)
4,7Disk Write Data (Floppy)DKWD
DKRD 4,7
Processor Data Bus (68000)
6,7Step Direction (Floppy)DIR
D[15:0] 2,3,6,7
Composite Sync (Video) 2,5CSYNC
CTS Clear to Send (RS232 Port) 6
Read-Time Clock Read / Write (RTC)
5Monochrome Composite Video (Video)COMP
CLKRD/WR 2,9
7.15909 MHz Quadrature Clock (Chips) 2,5,7CDAC
CHNG Media Change (Floppy) 6,7
Column Address Strobe (DRAM) 2,3CASL/U
CCK/CCKQ Color Clock / Quadrature (Chips) 2,4,7
Bus Request (68000)
6Device Busy (Parallel Port)BUSY
BR 2,7
Blitter Slowdown (Chips) 2BLISS
BLIT Chip Memory Access (Chips) 2,7
Bus Grant (68000)
2,7Bus Grant Acknowledge (68000)BGACK
BG 2,7
Audio Output (RS232 Jack) 4,6AUDOUT
BEER Bus Error (68000) 2,7
Address Strobe (68000) 2,7AS
AUDIN Audio Input (RS232 Port) 4,6
Processor Address Bus (68000) 2,3,7A[23:1]
ACK Data Acknowledge (Parallel Port) 6
28.63636 MHz Master Clock 228MHZ
7MHZ 7.15909 MHz Processor Clock 2,5
DESCRIPTION (AREA) PAGESSIGNAL
External Data ReadyXRDY 2,5
External Genlock Clock (Video) 2,5XCLK
XCLKEN External Clock Enable (Video) 2,5
Write Enable (DRAM)
6,7Write Protect Sense (Floppy)WPROT
WE 2,3
Valid Peripheral Address (68000) 2,7VPA
VSYNC Vertical Sync (Video) 2,5,6
Transmit Data (RS232 Port) 4,6TXD
VMA Valid Memory Address (68000) 2,6,7
Step In/Out Command (Floppy)
6,7Track Zero Sense (Floppy)TRK0
STEP 6,7
Drive Select (Floppy) 4,6,7SEL[3:0]
SIDE Side Select (Floppy) 6,7
Processor Read/Write (68000)
6Select (Parallel Port)SEL
RW 2,6,7
Processor Reset (68000)
4,6Receive Data (RS232 Port)RXD
RST 2,4,7
ROM Enable (ROM) 2,3ROMEN
RTS Request to Send (RS232 Port) 6
Red / Green / Blue (Video)
6Ring Indicate (RS232 Port)RI
R/G/B 5
General Reset 6,7RESET
RGA[8:1] Register Address Bus (Chips) 2,4,5
Row Address Strobe (DRAM) 2,3RAS0/1
RDY Drive Ready (Floppy) 6,7
RAM Enable (Chips)
2Chip Register Enable (Chips)REGEN
RAMEN 2
Paper Out (Parallel Port) 6POUT
PPD[7:0] Parallel Port Data (Parallel Port) 6
Pot Lines 0 X/Y (Joysticks)
4,5Pot Lines 1 X/Y (Joysticks)POT1X/1Y
POT0X/0Y 4,5
Override System Decoding
5Genlock Pixel Switch (Video)PIXELSW
OVR 2,7
Mouse 1 Quadrature V/H (Joysticks) 5M1V/M1H
OVL Overlay ROM over RAM 2,6
Motor On - Drive 0 (Floppy)
5Mouse 0 Quadrature V/H (Joysticks)M0V/M0H
MTR0 4,6,7
Light Pen Trigger (Joysticks) 2,6LPEN
MTR Motor On (Floppy) 4,6
DESCRIPTION (AREA)SIGNAL PAGES
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 3
_CLKRD
_CASU
_VSYNC
OVL
_CLKWR
_RAS0
_VMA
_HSYNC
XRDY
_EXTICK
_RAS1
_WE
_LPEN
_DTACK
_ROMEN
_INT3
CCKQ
A(20)
_LDS
_VPA
_CDAC
7MHz
R_W
_CASL
_CSYNC
DRA(8:0)
DMAL
_OVR
_HLT
RGA(8:1)
CDAC
_CCKQ
_CCK
CCK
_CCK_A
_RST
_CCK_B
_UDS
_AS
A(23:1)
_BR
DRD(15:0)
D(15:0)
_XCLKEN
_BG
E
7MHz
XCLK
_BEER
_BGACK
_IPL(2:0)
_FC(2:0)
7MHz_A
4.7Kx9
RP102
E103
47pF
XR1
68*
See Note Above!
470x7
RP104
GARY
5719
CONTROL FUNCTIONS
U5
FLOPPY FUNCTIONS
68
R114
R106
47
E106
47pF
E107
47pF
47pF
E108
U1
MC68000
VCC
JP5
JP5
JP5B
150
FB101
VCC
VCC
74LS244
U10
74LS244
U12
JP5C
4.7Kx9
RP102
74LS373
U11
74LS373
U13
RP104
470x74.7Kx9
RP101
U33
74F04
VCC
R101
27
27
R102
8372
U2
Agnus HR
U33
74F04
74F04
U33
74F04
U33
"Rock Lobster"
04/27/89
REV
Commodore
SIZE
SCALE SHEET OF
NEXT ASSYUSED ON
DRAWN BY: DATE
CHKD:
ENGR:
APPR:
2
8
1C
C/A500 Main Board
G. Robbins
PROCESSOR AND OTHER USEFUL COMPONENTS
GRR
09/09/88
C/A500
312006
312007
/USER/B52_LIB/ROCK_LOBSTER.REV6.X SHEET2
PATH:
A23 -> C00000 (default), A19 -> 080000
JP2 controls where expansion ram maps to:
and may be loaded with funny things...
Note: Various components are for EMI Control
04/27/89
Rock Lobster
XR1 is added to some boards per ECO 880283
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
VCC
RP103
39
39
RP103
SPARE
RP104
470x7
Note: PAL uses 28.37516 MHz
28.63636MHz
OSCILLATOR
X1
R113
47
68
R112
VCC
R111
68
4.7Kx9
RP101
47
R105
R103
47 47
R104
JP2
JP4
39
RP103
RP103
39
RP103
39
VCC
E104
68
68
E105
R107
47
10
10
3
2
9
_OEB
4
_LATCH
25
_OEL
3
R/W
12
_LDS
10
_UDS
11
CCK
28
_CDAC
26
_BGACK
14
_HLT
42
_VPA
2
_RST41
_ROMEN
21
XRDY
31
OVL
30
_OVR
29
A22
38
A21
37
A20
36
7
4,7
A18
34
6
21
7
7
A17
33
A23
39
_AS
13
_RAMEN20_REGEN
18
_CLKWR
23
_CLKRD
22
_BLISS
19
CCKQ
27
A19
35
_DTACK
43
_BLIT
15
_EXRAM
32
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
8
9
10
11
12
13
14
15
2Y1
9
2A1
11
1Y3
14
1A3
6
2Y4
3
2A4
17
1Y1
18
1A1
2
2Y2
7
2A2
13
1Y4
12
1A4
8
1Y2
16
1A2
4
2Y3
5
2A3
15
_OE2
19
_OE1
1
1Y1
18
1A1
2
2Y2
7
2A2
13
1Y4
12
1A4
8
1Y2
16
1A2
4
2Y3
5
2A3
15
2Y1
9
2A1
11
1Y3
14
1A3
6
2Y4
3
2A4
17
_OE2
19
_OE1
1
3,6
5
4 1
8
7
2,3,6,7
D7
17
Q7
16
D5
13
Q5
12
D1
3
Q1
2
D3
7
Q3
6
D8
18
Q8
19
D6
14
Q6
15
G_EN
11
O_C
1
D4
8
Q4
9
D2
4
Q2
5
D1
3
Q1
2
D6
14
Q6
15
D4
8
Q4
9
D2
4
Q2
5
D7
17
Q7
16
G_EN
11
O_C
1
D5
13
Q5
12
D3
7
Q3
6
D8
18
Q8
19
6
5
4
3 1
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
8
9
10
11
12
13
14
15
9 1
10
5
6
7
1 2
21
8
3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
23
17
18
19
20
21
22
23
4 1
12
109
8
7 1
2
1 2
7
7
7
3
5
11 10
6
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
65
1
5
43
87
43
9 1
2 1
3
2
1
3
2
1
4
4
5
5,6
5,6
6
7
4,5
3
3
3
3
3
3
5
4,5
4
21
5
3
3
3
7
6
7
3,4,5
3,6,7
2,3,6,7
5
1213
A1
60
7
6,7
7
7
7
7
4,7
2 1
OUT
3
A2
61
A3
62
A4
63
A5
64
1 2
21
1 2
1 2
A6
65
A7
66
0
1
2
0
1
2
A8
67
A9
68
A10
69
A11
70
A12
71
A13
72
A14
73
A15
74
A16
75
A17
76
A18
77
A19
59
DRD15
83
DRD14
84
DRD13
1
1
1 2
1 2
21
21212
D0 5
D1 4
D2 3
D3 2
D4 1
D5 64
D6 63
D7 62
D8 61
D9 60
D10 59
D11 58
D12 57
D13 56
D14 55
D15 54
_RST18
_HLT17
_IPL223
_IPL124
_IPL025
_BR13
_BG11
_BGACK12
_BEER22
FC226
FC127
FC028
CLK15
E20
_DTACK10
_VMA19
_VPA21
_AS6
R/_W9
_UDS7
_LDS8
A23 52
A22 51
A21 50
A20 48
A19 47
A18 46
A17 45
A16 44
A15 43
A14 42
A13 41
A12 40
A11 39
A10 38
A9 37
A8 36
A7 35
A6 34
A5 33
A4 32
A3 31
A2 30
A1 29
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
3421
1 243
DRD12
2
DRD11
3
DRD10
4
DRD9
5
DRD8
6
DRD7
7
DRD6
8
DRD5
9
DRD4
10
DRD3
11
DRD2
12
DRD1
13
1 2
DRD0
14
7MHz
38
RGA1
33
RGA2
32
5
RGA3
31
RGA4
30
RGA5
29
RGA6
28
RGA7
27
RGA8
26
_NTSC/PAL
41
{TEST,14M}
_RAS0
57
_RAS1
56
{,DRA9}
_CASL
54
_CASU
55
_WE
21
_LPEN
78
_CDAC
37
XCLK
35
{,A20}
_XCLKEN
36
_CSYNC
80
_VSYNC
79
_HSYNC
81
DRA0
43
DRA1
44
DRA2
45
DRA3
46
DRA4
47
DRA5
48
DRA6
49
DRA7
50
DRA8
51
_LDS
52
_UDS
53
R/W
22
_AS
24
_RESET
16
_REGEN
23
_RAMEN25_BLISS
19
_BLIT
20
CCK
40
CCKQ
39
DMAL
18
_INTR
17
28MHz
34
6,7
7
6,7
7
7
7
1
3
2
2 1
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 4
_CASL
_CASU
_RAS0
_RAS1
_WE
_CLKWR
_CLKRD
DRA(8:0)
A(23:1)
_CCK_A
DRD(15:0)
D(15:0)
_EXTICK
D(15:0)
A(23:1)
_ROMEN
U34
74F244
U35
74F244
47pF
E102
JP3B
+12V
"Rock Lobster"
04/27/89
REV
Commodore
SIZE
SCALE SHEET OF
NEXT ASSYUSED ON
DRAWN BY: DATE
CHKD:
ENGR:
APPR:
3
8
1
C
C/A500 Main Board
G. Robbins
MEMORY AND...WELL, I USED TO REMEMBER
GRR
09/09/88
C/A500
312006
312007
/USER/B52_LIB/ROCK_LOBSTER.REV6.X SHEET3
PATH:
Note: JP3 swaps internal vs. expansion ram
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
CNX
CNX
CNX1
VCC
-12V
JP3
JP3
JP7A
U19
XX4256-15
XX4256-15
U23
U18
XX4256-15
XX4256-15
U22
U17
XX4256-15
XX4256-15
U21
U16
XX4256-15
RAM
XX4256-15
U20
R201
4.7K 4.7K
R202
Mbyte ROM
ROM
62402
U6
VCC
RP111
4.7Kx9*4.7Kx9*
RP109
Note: RP105-RP111 are optional internal bus
termination, and are not normally loaded.
RP108
4.7Kx9* 4.7Kx9*
RP110
4.7Kx9*
RP105 RP106
4.7Kx9* 4.7Kx9*
RP107
68
RP201
SPARE
RP202
68
68
RP202
RP202
68
68
RP202
RP201
68
68
RP201
RP201
68
68
RP201
RP202
68
68
RP203
RP203
68
68
RP203
RP203
68
RP203
68
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC VCC
2,3,6,7
2,3,6,7
2A4
17
2A3
15
2
2
2
2
2
2
2
2
2A2
13
2
2,4,5
2A1
11
1A4
8
1A3
6
8
7
6
5
4
3
2
1
0
1 2
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
3
2
1
0
5
4
3
2
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1A2
4
1A1
2
2Y4
3
2Y3
5
2Y2
7
2Y1
9
1Y4
12
1Y3
14
1Y2
16
1 2
1Y1
18
_OE11_OE2
19
_OE2
19
_OE1
1
1Y1
12
1Y2
16
2,6
3
1
2
1Y3
14
1Y4
18
2Y1
9
2Y2
7
31
15
47
5
25
37
3
21
33
53
9
51
1
19
43
39
29
49
13
23
7
35
17
45
27
11
41
55
16
32
40
48
20
42
26
38
22
54
34
4
10
30
14
2
52
44
24
8
50
18
28
12
46
6
36
56
2Y3
5
2Y4
3
1A1
8
1A2
4
1A3
6
1A4
2
2A1
11
2A2
13
2A3
15
2A4
17
2 1
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
3
1 2
1 0
1 2
2
2,3,6,7
2,3,6,7
2
7 5 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
6
_OE
12
_CS
10
D0
13
D1
15
D2
17
D3
19
D4
22
D5
24
D6
26
D7
28
D8
14
D9
16
D10
18
D11
20
D12
23
D13
25
D14
27
D15
29
A17*
1
A16
32
A8
40
A9
39
A10
38
A11
37
A12
36
A13
35
A14
34
A15
33
A7
2
A6
3
A5
4
A4
5
A3
6
A2
7
A1
8
A0
9
WORD/_BYTE
31
11 9 8 10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
15 13 12 14
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
13915
115713
024681012
14
110
9876543
2
110
9876543
2
1415121310811
9
4321056
79
10111213141516
1234568
7
110
9876543
2
110
9876543
2
2345678
9
10 1
2345678
9
10 1
110
9876543
2
17181920212223
21
34
56
78
910
910
78
56
34
12
87
65
21
43
109
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 5
_INT3
_TxD
RIGHT
_MTR0
_SEL0
_INT6
_LED
_RxD
DMAL
CCKQ
_MTR
AUDIN
_DKWDB
POT1Y
POT1X
POT0Y
_MTRX
CCK
_RST
POT0X
LEFT
_DKRD
_INT2
_IPL(2:0)
RGA(8:1)
_KBRESET
RIGHT
LEFT
DRD(15:0)
_DKWEB
AUDOUT
PAULA
U3
8364
Note: Ground interconnection near audio jacks.
FB802
FB
R305
1K
U38
1488
AUDIO
10K
R306
C311
0.047uF
+AV
R307
2.7K
2N3906
Q301
0.047uF
C312
-AV
+AV
10K
R308
C313
0.047uF
AUDIO
0.01uF
C308
10K
R339
AUDIO
0.047uF
C314
AUDIO
AUDIO
FLOPPY
GARY
U5
FUNCTIONS
5719
Vref
Vref
/TL084
LF347
U14
AUDIO FILTERS
/TL084
U14
LF347
R321
360
C321
0.1uF
360
R331
0.1uF
C331
U36
74LS38
74LS38
U36
U36
74LS38
74LS38
U36
10K
R322
R332
10K
MPF102
Q321
Q331
MPF102
C322
6800pF
6800pF
C332
R323
10K
10K
R333
AUDIO
3900pF
C323
AUDIO
C333
3900pF
/TL084
U14
LF347
/TL084
LF347
U14
PAULA POWER!
U3
U14
-12V
+12V
10
R302
R301
10
C324
22uF
0.33uF
C325
22uF
C334
C335
0.33uF
0.33uF
C3
C302
0.33uF
0.33uF
C301
1K
R324
R334
1K
470uF
C307
C304
22uF
22uF
C303
"Rock Lobster"
04/27/89
REV
Commodore
SIZE
SCALE SHEET OF
NEXT ASSYUSED ON
DRAWN BY: DATE
CHKD:
ENGR:
APPR:
4
8
1
C
C/A500 Main Board
G. Robbins
PAULA DOES THINGS THAT DENISE DOESN'T
GRR
09/09/88
C/A500
312006
312007
PATH:
/USER/B52_LIB/ROCK_LOBSTER.REV6.X SHEET4
Note: LED off, Filters bypassed
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
AUDIO
AUDIO
390
R325
R335
390
AUDIO
1K
R304
R303
1K
-AV
AUDIO
+AV
EMI
E302
6800pF
EMI
E303
6800pF
0.33uF
C305
470K
R336
C306
10uF
Vref
R326
470K
JP10B
JP10A
R309
1
RIGHT
RCA JACK
CN3
LEFT
RCA JACK
CN4
270pF
E305
FB
FB
E306
270pF
VCC
VCC
RP501
10K
VCC
VCC
2,7
2
2,5
2
2,3,5
4,7
2,5
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
A_Gnd
34
_DKWD
38
DKWE
39
DRD13
44
LEFT
31
DRD8
1
RIGHT
30
DRD3
6
_DKRD
37
RGA7
20
P0X
32
RGA2
25
_INT6
18
_IPL2
15
DRD15
42
DRD10
47
DRD5
4
_RESET
11
DRD0
10
CCK
28
P0Y
33
P1X
35
P1Y
36
RGA4
23
_IPL0
13
DRD12
45
DRD7
2
DRD2
7
CCKQ
29
RGA6
21
_TXD
40
DMAL
12
RGA1
26
DRD14
43
DRD9
48
DRD4
5
RGA8
19
_RxD
41
RGA3
24
_IPL1
14
_INT2
16
DRD11
46
DRD6
3
DRD1
9
RGA5
22
_INT3
17
6
21
32
7
6
6
6,7
2
6,7
1 2
21
2
3
6,7
6
6,7
3
2
1
1 2
6
6
5
1 2
6
3
5
2
1212
21
1 2
_SEL
16
MTRX
47
_KBRESET
5
DKWDB
45
_DKWD9
MTRON
46
DKWEB
44
DKWE
8
_MTR
7
5
5
5
5
-
13
14
+
12
-
9
8
+
10
1 2
1 2
1 2
1 2
11
13
12
10
8
9
6
5
4
2
3
1
1 2
1 2
G
3
D1S
2
G
3
D1S
2
1
2
1
2
1 2
1 2
7
7
6,7
7
1
2
1
2
-
2
1
+
3
-
6
7
+
5
Vcc1
27
Gnd1
8
V-
11
V+
41 2 21
-
2
+
1
21
+
1-2
1 2
21
1 2 21
1 2
21
+
1
-
2
-
2
+
1
+
1
-
2
1 2
21
3
1 2
3
1 2
1 2
6
1 21 2
-
2
+
1
2
1
2 1
1 2
1 2
2 1
2 1
2 1
SHIELD
4
SIGNAL
1
SHIELD
4
SIGNAL
1
4
1 2 3
321
4
5 1
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 6
_CCK_C
_CCK
DI
POT0Y
HSYNC
B
POT0X
CSYNC
_CDAC
POT1Y
_HSYNC
G
DR
_FIRE0
POT1X
+5
7MHz_A
R
DG
+12
PIXLSW
_FIRE1
_XCLKEN
_XCLKEN
_CCK_B
DB
-5v
CCK
GND
GND
GND
GND
GND
DGND
VSYNC
_VSYNC
DRD(15:0)
_CSYNC
XCLK
XCLK
RGA(8:1)
_CCK_C
PIXLSW
PIXLSW
U4
47
RP402
C4
0.22uF
+VXX
R406
4.7
C402
3300uF
C403
47pF
U40
0.33uF
C40
U41
C41
0.33uF
+VID
VCC
U41
74HC245
U40
74HC245
+VID
C401
3300uF
4.7
R405
DENISE HR
U4
8373
R403
4.7K
JP11
VCC
RP402
47
74LS157
U15
47
RP402
RP402
47
R402
4.7K
E414
EMI4
6800pF
E413
EMI4
6800pF
E412
EMI4
6800pF
E411
EMI4
6800pF
COMPOSITE
CN10
RCA JACK
E435
FB
RIGHT JOY
DB9P
CN2
LEFT JOY
CN1
DB9P
VCC
E433
FB
E432
FB
E431
FB
C422
1000pF
1000pF
C412
VIDEO
CN9
DB23S
1000pF
C423
C413
1000pF
312007
312006
C/A500
09/09/88
GRR
DENISE IS PRETTY MUCH INTO VIDEO...
G. Robbins
C/A500 Main Board
C
1
9
5
APPR:
ENGR:
CHKD:
DATEBY:DRAWN
ONUSED ASSYNEXT
OFSHEETSCALE
SIZE
Commodore
REV
04/27/89
"Rock Lobster"
with EMI fliters, ferrite beads or resistors!
Note: Components designated as Exxx may be loaded
PATH:
~b52_lib/rock_lobster.rev6 sheet5
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
Note: R409 Controls Composite output
R409
150
level for 390229-01 Hybrid.
C421
1000pF
1000pF
C411
Note: RP405 Not Used
*
RP405
VCC
RP403
47
RP402
47
47
RP403
RP401
4.7Kx9
VCC
E405
EMI4
0.01uF
E404
EMI4
0.01uF
E403
EMI4
0.01uF
0.01uF
E406
EMI
E402
EMI4
150pF
+VXX
+12V
-12V
EMI
E434
150pF
RP403
47
47
RP403
RP403
47
VCC
R408
4.7
4.7
R401
470pF
EMI4
E415
0.01uF
EMI4
E401
470pF
EMI4
E416
470pF
EMI4
E417
470pF
EMI4
E425
0.01uF
EMI4
E408
470pF
EMI4
E426
470pF
EMI4
E427
6800pF
EMI4
E421
6800pF
EMI4
E422
6800pF
EMI4
E423
6800pF
EMI4
E424
E442
EMI4
470pF
E444
EMI4
470pF
E443
EMI4
470pF
E441
EMI4
470pF
47pF
E109
VCC
ANNEX
HY1A
COLOR
HYBRID
HY1
VIDEO
HY1
Note: Pin 2 and 21 of HY1 connected internallyNote: Pin 2 and 21 of HY1 connected internally
HY1A
+12V
Vcc1
19
Gnd1
37
109
43
2
2
2
2,4
2,4
2,3,4
2
12
1 2
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
+
1
-
2
65
21
87
6
B3
27
B2
26
B1
25
B0
24
G0
28
G1
29
G2
30
G3
31
R0
20
R1
21
R2
22
R3
23
PIXELSW
33
BURST
18
M1V
39
M1H
8
M0V
38
M0H
9
7M
35
CCK
36
DRD8
47
DRD9
46
DRD10
45
DRD11
44
DRD12
43
DRD13
42
DRD14
41
DRD15
40
DRD0
7
DRD1
6
DRD3
4
DRD2
5
DRD4
3
DRD5
2
DRD6
1
DRD7
48
RGA8
10
RGA7
11
Vcc1
20
Gnd1
10
12
Vcc1
20
Gnd1
10
12
RGA6
12
RGA5
13
RGA4
14
RGA3
15
12
3
5
B3
15
B2
16
B1
17
B0
18
B7
11
A5
7
B5
13
_OE
19
A7
9
A6
8
B6
12
B4
14
A2
4
DIR
1
A1
3
A3
5
A4
6
A0
2
B4
14
B5
13
B6
12
B7
11
B0
18
B1
17
B2
16
B3
15
_OE
19
DIR
1
A4
6
A3
5
A6
8
A0
2
A2
4
A5
7
A7
9
A1
3
12
2
4
RGA2
16
RGA1
17
_CDAC
34
BLANK
32
2 1
-
2
+
1
2 1
3
3
1
2
2143
2143
2143
4
1Y
4
2Y
7
3Y
9
4Y
12
4B
13
2B
6
1B
3
2A
5
1A
2
3A
11
3B
10
4A
14
G
15
S
1
21
3
2 1
3
2
2
2,6
2,6
1 2 3
SIGNAL
1
SHIELD
4
3
21
1 5
342
6
109
21
34
19
7865342
10
87
65
21
GATE
2
BURST
1
66
99
88
77
55
44
33
22
11
66
99
55
88
77
11
44
33
22
3
1 2
3
1 2
3
1 2
2 1 12
1515
2020
1919
1818
1717
1616
1313
1010
11
1212
2121
77
22
2222
88
33
1414
2323
99
44
55
1111
66
12 12
2 1 12 12
4
3 12
4
3 12
4
3 12
4
4
2
4
4
6
12 2 1
2 13
4
2 13
4
2 13
4
2 13
4
2 13
4
2 13
4
2 13
4
2 13
4
21 3
4
21 3
4
21 3
4
21 3
4
4
3 12
4
3 12
4
3 12
4
3 12
2 1
SYNC
20
B0
16
B1
15
B2
14
B3
13
G3
8
G2
9
G1
10
G0
11
R3
3
R2
4
R1
5
R0
6
CSYNC
18
AR
7
AG
12
AB
17
COMP
19
Gnd11Gnd2
22
Vcc12Vcc2
21
V+
3
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 7
_WPROT
AUDIN
_MTR
_KBCLOCK
_SIDE
R_W
_VMA
_CHNG
_FIRE1
_KBDATA
_SEL0
_LED
_FIRE0
_KBRESET
AUDOUT
_SEL1
_INT6
_LED
_HSYNC
OVL
_TxD
_RDY
_VSYNC
_SEL2
_INT2
_KBCLOCK
_STEP
_RESET
_RxD
_TRK0
_MTR0
_SEL3
_INDEX
_IORESET
PPD(7:0)
E
_KBDATA
D(15:0)
DIR
A(23:1)
_LPEN
_EXTICK
U37
74LS32
U37
74LS32
U8
8520
U7
8520
2N3904
Q501
E524
100pF
EMI
E523
100pF
EMI
E522
100pF
EMI
EMI
100pF
E521
E519
100pF
EMI
E518
100pF
EMI
E517
100pF
EMI
E516
100pF
EMI
E515
100pF
EMI
E514
100pF
EMI
E513
100pF
EMI
E512
100pF
EMI
E511
100pF
EMI
R501
10K
D501
1N914
U38
1488
U38
1488
U38
1488
R502
2.7K
PARALLEL PORT
CN7
DB25S
U39
1489
U39
1489
U39
1489
U39
1489
R506
10K
10K
R505
R504
4.7K
4.7K
R503
E520
470pF
EMI
Note: E501-503 are loaded with 47 Ohm 1/2 W resistors
47
E501
-12V
+12V
2N3906
Q503
Q502
2N3906
E536
470pF
EMI
E535
470pF
EMI
E537
470pF
EMI
47
E503
47
E502
E533
470pF
EMI
E534
150pF
EMI
E532
150pF
EMI
RS232
DB25P
CN6
312007
312006
C/A500
09/09/88
GRR
RS232, PARALLEL PORT AND KEYBOARD
G. Robbins
C/A500 Main Board
C
8
6
APPR:
ENGR:
CHKD:
DATEBY:DRAWN
ONUSED ASSYNEXT
OFSHEETSCALE
SIZE
Commodore
REV
04/27/89
"Rock Lobster"
1
PATH:
/USER/B52_LIB/ROCK_LOBSTER.REV6.X SHEET6
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
RS232 DECOUPLING
U39
E538
470pF
EMI
E531
470pF
EMI
C39
0.33uF
U38
C502
0.33uF
C501
0.33uF
KEYBOARD CONNECTOR
CN13
8-PIN SIL
VCC
JP7B
+12V -12V
R507
100
VCC
RP501
10K
10K
RP501
10K
RP501
VCC
VCC
RP501
10K
10K
RP501
VCC
JP8
VCC
RP501
10K
VCC
VCC
VCC
VCC
VCC
VCC
2,3
2,3,7
7
2,5
4,7
2,7
2,7
2,7
2
4,7
13
8
9
10
11
12
8
9
10
11
6
4
5
1
3
2
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
RS1
37
PA7
9
PB1
11
D2
31
_F
24
E
25
D7
26
PB6
16
PA1
3
C
40
S
39
PA0
2
PA6
8
_RESET
34
PB0
10
D0
33
D5
28
PB5
15
_CS
23
RS2
36
PA5
7
TICK
19
PA3
5
D3
30
_INT
21
PB4
14
RS0
38
D1
32
PB3
13
D6
27
RS3
35
_W
22
PB2
12
D4
29
PB7
17
_PC
18
PA2
4
PA4
6
S
39
E
25
D6
27
PB3
13
D1
32
RS0
38
PA4
6
C
40
_RESET
34
_INT
21
PB4
14
D3
30
TICK
19
RS2
36
PA5
7
_CS
23
PA0
2
PB5
15
D5
28
D0
33
PB0
10
PA6
8
PA1
3
_PC
18
PB6
16
D7
26
D2
31
PB1
11
PA7
9
RS1
37
PA2
4
_W
22
PB7
17
D4
29
PB2
12
RS3
35
PA3
5
_F
24
2
0
1
2
3
4
5
6
7
7
7
7
4,7
7
7
7
6
2
4,6
7
7
7
7
5
5
1
7
7
6
5
4
3
2
1
0
2
1
3
3
21
3
1 2
3
1 2
3
21
3
1 2
3
1 2
3
1 2
3
1 2
3
1 2
3
1 2
3
1 2
3
1 2
3
1 2
12
4
4
21
5
6
4
10
9
8
11
12
13
4,7
4,6
14
_AUTO
4D2
25
24
23
22
21
20
19
18
17
SELI
9D7
11BUSY
3D1
8D6
12POUT
13SEL
2D0
7D5
1_STROBE
16
_INIT
6D4
5D3
15
_ERR
10_ACK
8
10
9
4
6
5
11
13
12
3
1
2
12 12
1 2
1 2
3
1 2
3 12
4
1
3
2
1
3
2
1 2
3
1 2
3
1 22
3
21 3
4
21 3
4
1 2
3
3
1 2
1 2
3
7
22
RI
20
DTR
5
CTS
9
+V
4
RTS
10
-V
6
DSR
11
AO
2
TxD
8
CD
18
AI
19
sRTS
25
BZ
24
CLK
23
SS
21
SQD
17
RxC
13
sCTS
12
sCD
16
sRxD
15
TxC
14
sTxD
1
FG
7
SG
3
RxD
4,7
Gnd1
7
Vcc1
14
1
1 2
1 2
1 2
STATUS
7
+5
4
GROUND
6
RESET
3
INUSE
8
DATA
2
CLOCK
1
KEY
5
4
4
Vcc21Vcc1
14
Gnd1
7
2 1
3
2
3
2
2 1
3
8
2
1 9 1
2
1
3
2 1
3
2
1
7 1
6
4 1
10 1
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 8
XRDY
_OVR
_INDEX
E
_BR
_MTRX
_SEL0
_DKRD
7MHz
_DKWDB
_LDS
_KBRESET
_INT2
_SEL2
_WPROT
_SEL1
_STEP
R_W
_RESET
_CHNG
_SIDE
_INT6
_IORESET
_TRK0
DIR
_DTACK
_WPROT
_CONFIG
_CHNG
_MTR0
_DKWEB
_CCKQ
_SEL3
_BG
A(23:1)
_BEER
_RDY
_TRK0
_IORESET
_AS
_RST
_RDY
D(15:0)
_HLT
_DKWDB
_VMA
DIR
_CCK
CDAC
_SEL1
_BGACK
_VPA
_INDEX
_SIDE
_DKWEB
_IPL(2:0)
_UDS
_DKRD
_FC(2:0)
_RST
_STEP
C711
0.1uF
R711
1M
C712
10uF
47K
R712
E616
100pF
EMI
E615
100pF
EMI
E614
100pF
EMI
E613
100pF
EMI
E612
100pF
EMI
E611
100pF
EMI
0.01uF
C713
U42
NE555
EXTERNAL FLOPPY
DB23S
CN5
U42
R713
1K
0.33uF
C42
2N3904
Q711
E601
EMI4
0.01uF
E602
EMI4
0.01uF
E626
100pF
EMI
E625
100pF
EMI
E624
100pF
EMI
E623
100pF
EMI
E622
100pF
EMI
E621
100pF
EMI
E620
100pF
EMI
E619
100pF
EMI
E618
100pF
EMI
E617
100pF
EMI
+12V
POWER UP RESET
U37
74LS32
INTERNAL FLOPPY
CN11
CN11
CN11B
U37
74LS32
JP6
VCC
EXPANSION
P1A
P1
P1B
"Rock Lobster"
04/27/89
REV
Commodore
SIZE
SCALE SHEET OF
NEXT ASSYUSED ON
DRAWN BY: DATE
CHKD:
ENGR:
APPR:
7
8
1
C
C/A500 Main Board
G. Robbins
FLOPPY DISK AND EXPANSION CONNECTORS
GRR
09/09/88
C/A500
312006
312007
/USER/B52_LIB/ROCK_LOBSTER.REV6.X SHEET7
PATH:
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
E704
0.01uF
EMI
E703
0.01uF
EMI
E702
0.01uF
EMI
VCC
+12V
-12V
47pF
XC1
XC2
47pF
XC3
47pF
VCC VCC
VCC
JP1
VCC
4,7
6,7
OUT
3
DISCH
7
6,7
6,7
6
4
THRESH
6
TRIG
2
3
21
3
1 2
3
1 2
3
1 2
3
1 2
_RST
4
VC
5
77
66
55
44
33
2323
2
_RD
2
16
_WE
16
21
_SEL1
21
1212
1
_RDY
1
15
_TRK0
15
20
_SEL3
20
14
_WPROT
14
19
_DIR
19
13
SIDE
13
18
_STEP
18
9
_SEL2
9
17
_WD
17
8
_MTRX
8
22
_INDEX
22
10
_RESET
10
11
_CHNG
11
Gnd1
1
Vcc1
8
1 2
2
1
3
3 2 1
4
3 12
4
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
3
1
4,6
6,7
6,7
6
6,7
6,7
4,7
4,7
6,7
6,7
6,7
6,7
6,7
4,7
6,7
6,7
4,7
4,7
6,7
6,7
4
6,7
4,6,7
6,7
6,7
2,4,7
13
12
11
20
_STEP
8
_INDEX
32
_SIDE
22
_WD
18
DIR
34
_RDY
4
_MTRON
16
_MTRON
24
_WE
26
_TRK0
2
_CHNG
28
_WPROT
12
_SEL1
10
_SEL0
30
_RD
6
_INUSE
14
_SEL2
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
1
3
8
10
9
6
6,7
2,3,6
2,3,6
4,6
2
2
2
2
1
3
7
9
11
4
6
8
15
5
0
10
14
1
13
2
12
20
4
2
7
10
12
17
21
19
3
9
11
16
18
6
8
15
5
14
22
1
13
23
53
27
81
31
3
13
25
49
61
73
85
37
1
71
5
47
55
51
83
35
63
45
23
33
75
65
43
21
77
67
41
57
19
79
29
69
39
59
17
9
11
7
15
56
24
28
82
34
78
2
4
38
72
6
62
48
16
58
54
84
26
32
80
36
74
64
46
14
52
12
86
30
76
66
44
22
68
42
10
70
40
8
50
60
18
20
3
12
3
12
3
2 1
2
1
0
2
1
0
2
2
2
2,6
2
2
2
2
2
2,4,7
2,6
2,6
2
2
2,4
2
4,6
2
2
2
2
112
12
2
12
21
+
1
-
2
2
2 1
2 1
2 1
1
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 9
U34
U16
U7
CN1
GROUNDED HOLES, &c.
C34
0.33uF
0.33uF
C16
C7
0.33uF
0.33uF
C14
POWER INPUT
5-PIn SQ
CN8
NOTE: HEAVY LINES INDICATE A
SINGLE POINT CONNECTION
U35
U17
U8
DECOUPLING
U1
CN2
0.33uF
C35
C17
0.33uF
0.33uF
C8
C1
0.33uF
U36
U18
C800
0.01uF
U2
0.33uF
C36
0.33uF
C18
E101
0.01uF
EMI
LINE FILTER
LF1
0.33uF
C2
U37
U19
U10
X1
C37
0.33uF
C19
0.33uF
C10
0.33uF
C701
0.33uF
U11
0.01uF
C801
C803
0.01uF
0.01uF
C802
C11
0.33uF
C804
0.33uF
U20
U12
U5
47uF
C822
C821
47uF
0.33uF
C20
0.33uF
C12
C5
0.33uF
100uF
C811
-12V
+12V
U21
U13
U6
100uF
C812
C21
0.33uF
0.33uF
C13
0.33uF
C6
C813
100uF
U22
0.33uF
C22
100uF
C814
Note: U20-23 and C20-23 not loaded for 512K system
U23
U15
100uF
C815
U33
C23
0.33uF
C15
0.33uF
E407
0.01uF
EMI
C816
100uF
0.33uF
C33
+VCB
+12V
CN5
+VCB
FLOPPY POWER
Note: Some drives are +5 only...
4-PIN SIL
CN12
74F04
U33
SPARES
74F04
U33
"Rock Lobster"
04/27/89
REV
Commodore
SIZE
SCALE SHEET OF
NEXT ASSYUSED ON
DRAWN BY: DATE
CHKD:
ENGR:
APPR:
8
8
1
C
C/A500 Main Board
G. Robbins
POWER DISTRIBUTION AND DECOUPLING
GRR
09/09/88
C/A500
312006
312007
/USER/B52_LIB/ROCK_LOBSTER.REV6.X SHEET6
PATH:
Schematic A500 R6a/7
A500 Rev 6a/7 PCB
VCC
VCC
VCC
VCC
VCC
VCC
CN6
U2
CN7
CN9
MT7
MT6
MT4
MT2
MT1
MT5
Gnd1
10
Vcc1
20
Vcc1
10
Gnd1
20
Gnd1
1
Vcc1
20
1 2 21 1 2
10 11
2
SH
SH
1
+5
4
GND
3
+12
5
-12V
6
7
Gnd1
10
Vcc1
20
Vcc1
10
Gnd1
20
Gnd1
1
Vcc1
20
Gnd116Gnd2
53
Vcc249Vcc1
14
1 2 21 1 2
1 2
Gnd1
7
Vcc1
14
Vcc1
10
Gnd1
20
21
Gnd242Gnd182Gnd3
58
Vcc1
15
1 2 21
10 11
24
8
2 7
5
1
6
4
3
1 2
Gnd1
7
Vcc1
14
Vcc1
10
Gnd1
20
Gnd1
10
Vcc1
20
Gnd21Gnd1
2
Vcc1
4
1 2 21 1 2
25
26
Gnd1
10
Vcc1
20
27
85
21 1 2
1 2
86
26
Vcc1
10
Gnd1
20
Gnd1
10
Vcc1
20
Gnd224Gnd11Gnd3
40
Vcc348Vcc217Vcc1
6
+
1
-
2
-
2
+
1
21 1 2
1 2
-
2
+
1
Vcc1
10
Gnd1
20
Gnd1
10
Vcc1
20
Gnd230Gnd1
11
Vcc1
21
-
2
+
1
21 1 2
1 2
-
2
+
1
Vcc1
10
Gnd1
20
21
-
2
+
1
Vcc1
10
Gnd1
20
Gnd1
8
Vcc1
16
-
2
+
1
Gnd1
7
Vcc1
14
21 1 2
27
24 25
-
2
+
1
1 2
1
4
2
3
9 8
21
2 1
2 1
12
2
3
1
2 1
2
3
1
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
Page 10
XD(15:0)
XD(15:0)
_XCLKCS
XA(23:1)
_XCLKRD
_XCLKWR
_XCLKCS
_XCLKRD
_XCLKWR
_XOE
_XCASL
_XCASU
_XRAS0
_XRAS1
_XWE
XDRD(15:0)
XA(23:1)
RP911
4.7Kx9* 4.7Kx9*
RP912
74F86
U12
U13
74F27
74LS163A
U11
Refresh"Feature"
XX4256-15
U3
DRAM
256Kx4
U4
XX4256-15
DRAM
256Kx4
EXP
74F86
U12
U12
74F86
U13
74F27
XX4256-15
U1
DRAM
256Kx4
+5X
EXP
EXP
+5X
U2
XX4256-15
DRAM
256Kx4
470
R913
JP1
EXP
TP9
EXP
U13
74F27
03/19/89 GRRProduction
1
JP9A
Real Time Clock
MSM6242B
U9
+5X
10K
R915
+5X
+5X
EXP
JP9
JP9
74F86
U12
TC9
6.8-45pF
22pF
C911
JP3
47pF*
C10
EXP
EXP
JP2
U11
C11
0.33uF
U12
0.33uF
C12
U13
C13
0.33uF
+5X
+5X
R912
10K
+5X
Y9
32768Hz
C10 is optional A8/RAS Setup Time Control
RP911,RP912 are optional DRD Termination
/USER/B52_LIB/CAKE.REV6.X SHEET1
PATH:
Agnus Fat/HR HR (2M)
JP9 1-2,1-2 1-1,2-2
JP1 1-2 -
U1-U4 256Kx4 1Mx4
on A501 512K -
on-board 512K 2M
A B
Configuration Options
04/27/89
Cake
U1-U4 are generic 256K-bit x 4 120 nS DRAM
1Mbit Flavor"Cake"
04/27/89
REV
Commodore
SIZE
SCALE SHEET OF
NEXT ASSYUSED ON
DRAWN BY: DATE
CHKD:
ENGR:
APPR:
1
1
1C
C/A501 512K Memory
G. Robbins
512K/2M-BYTE RAM EXPANSION AND CLOCK
GRR
03/26/89
C/A500
312987
312988
Notes: Some configurations of this RAM expansion
require mods to rev 3 and 5 A500 boards
and/or use of the Agnus HR 2MB bond-out.
TP9 is Clock Calendar Frequency Test Point
A501 Rev 6c PCB
Schematic, A501 R6c
ECO History
DESCRIPTIONECO NUMBER DATE
10K
R914
Revision History
REV DESCRIPTION APRVLDATE MANAGER
0.1uF
C9
+5X
U9
4.7uF
C913
+5X
1N914
D911
1N914
D912
EXP
Real Time Power
BT9
3/60DK
100mAH
470
R911
+12X
100uF
C903
+5X
C902
100uF
Decoupling...
EXP
0.33uF
C4
U4
C3
0.33uF
U3
0.33uF
C2
U2
C1
0.33uF
RP901
68
68
RP901
RP901
68
68
RP901
RP901
68
68
RP902
RP902
68
68
RP902
RP902
68
68
RP903
RP903
68
68
RP903
68
RP903
RP903
68
U1
EXP
+5X
RP902
68
CNY1
CNY
CNY
EXP
+12X
1 2
21
1 2
3512476
10
9
8
1 2
1 2
1 2
1
2 1
XT
16
STD.P
1
CS1
15
_WR
10
_RD
8
D311
D212
D113
D014
A04
A15
A26
A37
_CS0
2
_XT
17
ALE
3
21
12
3
2
2
1
11
12
13
6
1
1
2
1 2
1 2
3
4
6
5
11
9
8
10
2
13
12
1
nc
5
_OE
16
_RAS
4
A8
15
21
12
2
3
4
5
0
1
D3
18
2
3
Vcc1
18
Gnd1
9
-
2
+
1
21
21
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
21
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
_WE
3
A7
14
A6
13
A5
12
2
A4
11
5
A3
9
A2
8
A1
7
4
3
A0
6
8
9
10
D2
2
2 1
-
3
4.5V
Ni-Cd
+
2
nc
5
D4
19
_OE
16
_RAS
4
A8
15
D3
18
D1
1
_CAS
17
1
_WE
3
A7
14
A6
13
2 1
A5
12
A4
11
A3
9
A2
8
A1
7
A0
6
D22D4
19
nc
5
_OE
16
1415131210119867
QD
11
QC
12
LD
9
QB
13
QA
14
RO
15
CLK
2
ENP7ENT
10
B
4
C
5
D
6
CLR
1
A
3
_RAS
4
A8
15
542310
Gnd1
8
Vcc1
16
8
D3
18
D1
1
Gnd1
7
Vcc1
14
_CAS
17
_WE
3
Gnd1
7
Vcc1
14
15
14
13
12
11
10
9
8
-
2
+
1
7
6
5
4
3
2
-
2
+
1
1
0
21
A7
14
A6
13
1412108642
0
1513119753
1
8
9106742153
1
3
1
2
3
1
2
0
1
2
3
4
5
6
7
9
Vcc1
10
Gnd1
20
Vcc1
10
Gnd1
20
0
1
2
3
4
5
6
7
8
9
Vcc1
10
Gnd1
20
0
1
2
3
1 2
3 4
5 6
7 8
9 10
9 10
7 8
5 6
1 2
2 1
4 3
9 10
7 8
6 5
A5
12
A4
11
Vcc1
10
Gnd1
20
2
3
4
5
A3
9
A2
8
A1
7
A0
6
D22D4
19
4 3
48
50
52
54
56
28
30
32
34
36
38
40
42
44
46
8
10
12
14
16
18
20
22
24
26
6
4
2
1
3
5
25
23
21
19
17
15
13
11
9
7
45
43
41
39
37
35
33
31
29
27
55
53
51
49
47
© rebuild for www.amigawiki.org · for private use only
Rev.1.37 (02.09.2012)
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