Posted By
weidi
on 2021-12-20
10:44:51
|  Re: Cartridge port Not working correctly
Sorry I'm probably getting nervous but another idea to trace fault:
Highest voltage +5.8V is on the U22 pin2 - it is R/W line coming from CPU.
CPU controls Datasette motor thru U6 (7406).
You can trace high voltage on:
1) U2 pin 23 - CPU R/W output
2) U2 pin 27 - CPU P3 output
3) U6 pin 3 - 7406 input
4) U6 pin 4 - 7406 output
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