Pin | Name | Direction | Description |
---|
1 | /CS1 | Output | Memory Read in addresses 4000-7FFF |
2 | /CS2 | Output | Memory Read in addresses 8000-BFFF |
3 | /CS12 | Output | Memory Read in addresses 4000-BFFF |
4 | /SLTSL | Output | Low when Slot 2 (cartridge slot) is selected |
5 | n/c | --- | Not connected. |
6 | /RFSH | Output | Refresh signal from CPU |
7 | /WAIT | Input | OC, Tells CPU to wait. Refresh signal is not maintained |
8 | /INT | Input | OC, Requests a interrupt to CPU (call to addr 38h) |
9 | /M1 | Output | CPU fetches first part of instruction from memory. |
10 | /BUSDIR | Input | NC, was used to control the data direction. |
11 | /IORQ | Output | I/O request signal. (Address=Port) |
12 | /MREQ | Output | Memory request signal. (Address=Address) |
13 | /WR | Output | Write signal (strobe) |
14 | /RD | Output | Read signal (strobe) |
15 | /RESET | Input | Reset |
16 | n/c | --- | Not connected. |
17 | A0 | Output | Address 0 |
18 | A1 | Output | Address 1 |
19 | A2 | Output | Address 2 |
20 | A3 | Output | Address 3 |
21 | A4 | Output | Address 4 |
22 | A5 | Output | Address 5 |
23 | A6 | Output | Address 6 |
24 | A7 | Output | Address 7 |
25 | A8 | Output | Address 8 |
26 | A9 | Output | Address 9 |
27 | A10 | Output | Address 10 |
28 | A11 | Output | Address 11 |
29 | A12 | Output | Address 12 |
30 | A13 | Output | Address 13 |
31 | A14 | Output | Address 14 |
32 | A15 | Output | Address 15 |
33 | D0 | --- | Data 0 |
34 | D1 | --- | Data 1 |
35 | D2 | --- | Data 2 |
36 | D3 | --- | Data 3 |
37 | D4 | --- | Data 4 |
38 | D5 | --- | Data 5 |
39 | D6 | --- | Data 6 |
40 | D7 | --- | Data 7 |
41 | GND | --- | Ground |
42 | CLOCK | Output | CPU clock, 3.579 MHz |
43 | GND | --- | Ground |
44 | SW1 | --- | NC, Insert/remove detection for protection |
45 | +5V | Output | +5 VDC (300mA max /slot) |
46 | SW2 | --- | NC, Insert/remove detection for protection |
47 | +5V | Output | +5 VDC (300mA max /slot) |
48 | +12V | Output | +12 VDC (50mA max /slot) |
49 | SOUNDIN | Input | Sound input (-5dBm) |
50 | -12V | Output | -12 VDC (50mA max /slot) |