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50 PIN UNKNOWN CONNECTOR
| Pin | Name | Description |
|---|---|---|
| 1 | +5V | +5 VDC |
| 2 | A1 | Address bit 1 |
| 3 | A2 | Address bit 2 |
| 4 | A3 | Address bit 3 |
| 5 | A4 | Address bit 4 |
| 6 | A5 | Address bit 5 |
| 7 | A6 | Address bit 6 |
| 8 | A7 | Address bit 7 |
| 9 | A8 | Address bit 8 |
| 10 | A9 | Address bit 9 |
| 11 | A10 | Address bit 10 |
| 12 | A11 | Address bit 11 |
| 13 | A12 | Address bit 12 |
| 14 | A13 | Address bit 13 |
| 15 | A14 | Address bit 14 |
| 16 | A15 | Address bit 15 |
| 17 | A16 | Address bit 16 |
| 18 | A17 | Address bit 17 |
| 19 | A18 | Address bit 18 |
| 20 | A19 | Address bit 19 |
| 21 | A20 | Address bit 20 |
| 22 | A21 | Address bit 21 |
| 23 | A22 | Address bit 22 |
| 24 | A23 | Address bit 23 |
| 25 | GND | Ground |
| 26 | GND | Ground |
| 27 | /DTACK | Data Transfer Acknowledge |
| 28 | /AS | Address Strobe |
| 29 | /ROM_CS | ROM Chip Select |
| 30 | 16M | 16 MHz Clock |
| 31 | /EXT_DTACK | External Data Transfer Acknowledge |
| 32 | /DELAY_CS | |
| 33 | D0 | Data bit 0 |
| 34 | D1 | Data bit 1 |
| 35 | D2 | Data bit 2 |
| 36 | D3 | Data bit 3 |
| 37 | D4 | Data bit 4 |
| 38 | D5 | Data bit 5 |
| 39 | D6 | Data bit 6 |
| 40 | D7 | Data bit 7 |
| 41 | D8 | Data bit 8 |
| 42 | D9 | Data bit 9 |
| 43 | D10 | Data bit 10 |
| 44 | D11 | Data bit 11 |
| 45 | D12 | Data bit 12 |
| 46 | D13 | Data bit 13 |
| 47 | D14 | Data bit 14 |
| 48 | D15 | Data bit 15 |
| 49 | +5V | +5 VDC |
| 50 | +5V | +5 VDC |
Unbuffered data bus, bits 0 through 15
Unbuffered 68HC000 address bus, bits 1 through 23
16 MHz system clock
External data transfer acknowledge that disables main system /DTACK.
68HC000 Address strobe
Data transfer acknowledge, /DTACK input to 68HC000.
This signal is generated by the addressing PAL and is used to put the ROM board into the idle mode by inserting multiple wait states.
Permanent ROM chip select signal. Selects in range $90 0000 through $9F FFFF.
| Contributor: | Joakim Цgren |
| Source: | Technote HW13: Macintosh Portable ROM Expansion at Apple Technical Notes |
Информация предоставлена справочником The Hardware Book Team 1996-2004.
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