Laser 128 - Page 226

EXPANSION CONNECTORS DIAGRAMS
0
CND 26 25 +SY
N. C. 27
24 N.C.
~ 28 23
N.C.
mu 29
22 om
I RQ
30 21 ROY
'PR ST
31 20
l /O ST ROB E
nm
32
19 ~
-12V
33 18 R/ IV
~ 34 17
D AIS
F JS 8M
JS 16 DAl4
f7M 36 IS
BAil
QJ 37 14
BA l2
+1 38 13 D Aii
pP SY NC 39
12
BA IO
to 40 II BA9
COFx 41
10 BAS
0 07
42
9 BA7
006 43
BA6
no s
44
BAS
804
4S BA4
BDJ 46
BAJ
002
47 DA2
DO I 48
BAI
O DO 49
D AO
+llV so
C7XX
0
Figure C-9 Expansion connector
1. C 7XX - active low when
address $C7XX is accessed
2. address bus
3. addres s bus
4. addres s bus
5.
a ddre ss bus
6. address bus
7.
address bus
8. address bus
9. add ress bus
10 . address bus
11. add r ess bus
12. address bus
13. address bu s
14 . ad dre ss bu s
15 . address bus
16. address bus
17. address bus
18. R/W - read/write
~9. CSYNC - composite sync
20. I /O STROBE - active low when
slot $C800 - $CFFF is accessed
21. RDY - CPU Ready input
22. DMA - active low for direct memo ry access
23 . N .C. - no conn ect ion
2 4. N.C. - no co nn ec ti on
25. + 5 volt
26 . ground
27 . N.C . - no connection
28. CODX - acti ve low when $CODX is acce sse d
29 . NMI - active low for no n- ma ska ble int er ru pt
30. IQR - active l ow for inte rrupt r eq u est
31. UPRST - active l ow during r eset
32. INH - active low to inhibit memo ry .
33. -12 volt
A-13a