Laser 128 - Page 227

EXPANSION CONNECTORS DIAGRAMS
34. CSXX - active low when $C5XX is accessed
43. data bus
35. F358M - chroma frequen cy signal
44. data bus
36. F7M - 7 MHZ sig nal
45. data bus
37. Q3 - 2 MHZ signal
46. data bus
38. 01 - 1 MHZ signal
47. data bus
39. UPSYNC - CPU signal
48. data bus
40. (Jo - 1 MHZ signal
49. data bus
41. COFX - activ.e low when $COFX is accessed
50. +12 volt
42. data bus
GND RASB ECASI ERAJ ERA7 RD2 RD6
c~o I c~o I Ec~sJ I ER
1
At I ERfs I R?o I R~• I Et~oE
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
DOOODDODDDODODD
o o o o o o o o o a o a o a o
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+~v I ~ I EcAs2 I EJA2 I ER
1
A6 I R~t I a!s J MiM Ro
+SY ECAS4 ERAO ERA4 ERAS RDJ RD7
Figure C-10 Expansion memory connector
1. +5v
2. +sv
3. RWR - active low for RAM write
4. ECAS4 - Bank 4 RAM CAS
5. ECAS2 - Bank 2 RAM CAS
6. RAM address
7. RAM address
8. RAM address
9. RAM addre ss
10. RAM address
11. RAM data
12. RAM data
13. RAM data
14. RAM data
15. MEMRD- active high for re ad
16. EIMOE - expansion RAM data
buffer output enable
A-13b
17. RAM data
18. RAM data
19. RAM data
20. RAM data
21. RAM address
22. RAM address
23. RAM address
24. RAM add ress
25. ECASl - Bank 1 RAM CAS
26. ECAS3 - Bank 3 RAM CAS
27. RASB - RAM RAS
28. ground
29. ground
30. ground