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The issue 5 boards have been designed for foreign electromagnetic standard compliance. The differences have to be developped.
The following information has been copied from an A2 size Cambridge Computers Z88 Circuit Diagram Drawn by F.I. 4.4.87 Checked by A. A. R. 13.4.87 | | | | |
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| 1 | 4-4-87 | | | | | 2 | 29-4-87 | CCL 1 - 7 | 1 | R52 (22K) removed | | | | TED | 2 | IC3 pins 1, 30, 31, 32 conn to VCC not SVCC | | | | ECN 2232 | 3 | Conn pin 20 of SK 2, 3, 4 to VCC instead of SVCC | | | | | 4 | Conn pin 19 of SK 2, 3, 4 to VCC instead of SVCC | | | | | 5 | Conn RP6 pin 1 to VCC instead of SVCC | | | | | 6 | Conn C27 to VCC instead of SVCC | | | | | 7 | R38 change from 1M to 47K | | | | | 8 | C23 change from 100nF to 10nF | | | | | 9 | Conn R17 to IC1 pin 17 instead of VCC | | | | | 10 | Add TR25 | | | | | 11 | Add R80 | | | | | 12 | Add R81 | | | | | 13 | Add D30 | | 3 | 12-6-87 | CCL 7 - 12 | 14 | R41 change from 470R TO 150R | | | | TED | 15 | Remove R23 from SVCC and conn in // with D9 | | | | ECN 2330 | 16 | Add C31 1nF from GND to IC4/97 | | | | | 17 | Add C32 330pF from IC1/17 to GND | | | | | 18 | Add 10M res between SK10 pin 1 and metal case | | | | | 19 | Add RV2 5K0 in // with RV1 |
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