/* Imported from Wayback Machine
   Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:spx-mpu:mpuconn:array4x16
   Snapshot date: 2025-06-14
   Generator    : wayback-archiver
*/

**4×16 Test Pads**

Note: Row D is closest to the edge of board; pin 1 is closest to the hexadecimal rotary switch.

|   |Name   |Comment                                 |
|A1 |D12    |Data 12                                 |
|A2 |D13    |Data 13                                 |
|A3 |D14    |Data 14                                 |
|A4 |D15    |Data 15                                 |
|A5 |nHALT  |68302 nHALT                             |
|A6 |nUDS   |upper data strobe                       |
|A7 |nLDS   |lower data strobe                       |
|A8 |R/W    |read-write                              |
|A9 |nAS    |Address strobe                          |
|A10|3.68MHz|3.68MHz clock                           |
|A11|CLKCTRL|Enable 3.68MHz clock to 68692           |
|A12|       |                                        |
|A13|       |                                        |
|A14|       |                                        |
|A15|Ground |                                        |
|A16|Ground |                                        |
|   |       |                                        |
|B1 |D0     |Data 0                                  |
|B2 |D1     |Data 1                                  |
|B3 |D2     |Data 2                                  |
|B4 |D3     |Data 3                                  |
|B5 |D4     |Data 4                                  |
|B6 |D5     |Data 5                                  |
|B7 |D6     |Data 6                                  |
|B8 |D7     |Data 7                                  |
|B9 |D8     |Data 8                                  |
|B10|D9     |Data 9                                  |
|B11|D10    |Data 10                                 |
|B12|D11    |Data 11                                 |
|B13|       |                                        |
|B14|Ground |                                        |
|B15|Ground |                                        |
|B16|Ground |                                        |
|   |       |                                        |
|C1 |A13    |Address 13                              |
|C2 |A14    |Address 14                              |
|C3 |A15    |Address 15                              |
|C4 |A16    |Address 16                              |
|C5 |A17    |Address 17                              |
|C6 |A18    |Address 18                              |
|C7 |A19    |Address 19                              |
|C8 |A20    |Address 20                              |
|C9 |nCS1   |To nCS1 of 68302 via 330 series resistor|
|C10|nCS2   |To nCS2 of 68302 via 330 series resistor|
|C11|nCS3   |To nCS3 of 68302 via 330 series resistor|
|C12|nCS0   |To nCS0 of 68302 via 330 series resistor|
|C13|       |                                        |
|C14|Ground |                                        |
|C15|Ground |                                        |
|C16|Ground |                                        |
|   |       |                                        |
|D1 |A1     |Address 1                               |
|D2 |A2     |Address 2                               |
|D3 |A3     |Address 3                               |
|D4 |A4     |Address 4                               |
|D5 |A5     |Address 5                               |
|D6 |A6     |Address 6                               |
|D7 |A7     |Address 7                               |
|D8 |A8     |Address 8                               |
|D9 |A9     |Address 9                               |
|D10|A10    |Address 10                              |
|D11|A11    |Address 11                              |
|D12|A12    |Address 12                              |
|D13|       |                                        |
|D14|       |                                        |
|D15|Ground |                                        |
|D16|Ground |                                        |

\\