Service manual

2. Circuit descriptions
A. Maiin PWB (MCU)
(1) CPU signal table
CPU pin table
Model without SPF
PIN No Signal code Input/output Operating
1 /CS1 Output Chip Select for SRAM
2 /CS0 Output Chip Select for EPROM
3 D-GND
4 D-GND
55V
6 A0 Output Address Bus (NC-pull up)
7 A1 Output Address Bus
8 A2 Output Address Bus
9 A3 Output Address Bus
10 Output D-GND
11 A4 Output Address Bus
12 A5 Output Address Bus
13 A6 Output Address Bus
14 A7 Output Address Bus
15 A8 Output Address Bus
16 A9 Output Address Bus
17 A10 Output Address Bus
18 A11 Output Address Bus
19 Output D-GND
20 A12 Output Address Bus
21 A13 Output Address Bus
22 A14 Output Address Bus
23 A15 Output Address Bus
24 A16 Output Address Bus
25 A17 Output Address Bus (for 2Mbit EPROM) - (NC)
26 A18 Output Address Bus (NC-pull up)
27 A19 Output Address Bus (NC-pull up)
28 D-GND
29 A20 Output Address Bus (NC-pull up)
30 NC-pull up
31 NC-pull up
32 (Interruption input) NC-pull up
33 (MHPS) Interruption level input Mirror Home Position Sensor
34 /CPUSYNC Interruption level input Horizontal Synchronous (from G/A)
35 D-GND
36 D-GND
37 ZC Interruption level input Zero-cross signal
38 /ASICINT Interruption level input Intterupt from G/A
39 5V
40 D0 Data input/output Data Bus
41 D1 Data input/output Data Bus
42 D2 Data input/output Data Bus
43 D3 Data input/output Data Bus
44 D-GND
AL-1000/1010
12-3