When one problem is not enough, we create another one
Join the community on Discord: / discord
My Tipeee: fr.tipeee.com/rodrik-studio/
00:00 Introduction
01:09 Alterations
04:37 Battle plan
06:28 A disaster
07:20 Power operation
09:35 Measurements
13:38 Fault 1 found
15:31 Back to the beginning
16:28 RAM ok and the rest
18:34 Gibberish
20:16 VRAM validation
20:53 EPROM and adapter
24:47 Failed test
25:19 Disappointing test
27:00 Operation of resets
29:13 The next steps
#TSR80
Description :
=============
Troubleshooting a machine is not easy, this TRS-80 is no exception. Not pleased with having a fault on the machine, a stupidity and here I am with 2 fault. As much as the one I caused wasn't too complicated, the second one isn't simple.
My way of proceeding led me to a false breakdown once again. The next step will be to trace the signals on the card, still hours of research ahead.
In the end what we know:
- The CPU is working
- ROM is good
- RAM is good
- VRAM is good
- Character ROM is good
Happy viewing.
22 июл 2024