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U 27 26 25 24 23 22 21 8 7 6 5 4 3 2 1
.-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-.
|^^^^^^^^^^^^^^^^^^^^^^^^^^^^ /////// ^^^^^^^^^^^^^^^|^^^^^^^^^^^^^^^^|
|____________________________ /////// _______________|________________|
`-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-'
L 27 26 25 24 23 22 21 8 7 6 5 4 3 2 1
EXPANSION I/O socket
| Pin |
Upper row (U) |
Lower row (L)
|
| 1 |
A15 |
A14
|
| 2 |
A13 |
A12
|
| 3 |
D7 |
+5V
|
| 4 |
ROM 1 OE |
not used
|
| 5 |
D0 |
GND
|
| 6 |
D1 |
GND
|
| 7 |
D2 |
CK
|
| 8 |
D6 |
A0
|
| 9 |
D5 |
A1
|
| 10 |
D3 |
A2
|
| 11 |
D4 |
A3
|
| 12 |
INT |
not used
|
| 13 |
NMI |
GND
|
| 14 |
HALT |
ROM 2 OE
|
| 15 |
MREQ |
DISK RD
|
| 16 |
IORQ |
DISK WR
|
| 17 |
RD |
MOTOR ON
|
| 18 |
WR |
BUSRQ
|
| 19 |
not used |
RESET
|
| 20 |
WAIT |
A7
|
| 21 |
+12V |
A6
|
| 22 |
-12V |
A5
|
| 23 |
M1 |
A4
|
| 24 |
RFSH |
not used
|
| 25 |
A8 |
BUSACK
|
| 26 |
A10 |
A9
|
| 27 |
RESET |
A11
|
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