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| author | Andreas Baumann <mail@andreasbaumann.cc> | 2023-06-22 09:18:04 +0200 |
|---|---|---|
| committer | Andreas Baumann <mail@andreasbaumann.cc> | 2023-06-22 09:18:04 +0200 |
| commit | d232766ed6499c7d271cd50074a89695259cc77e (patch) | |
| tree | e2a154b86f4d7636e9301afd689689a9f4ba42c8 /content | |
| parent | 2918cdc783545229f1dde97aefe7d5f6a306e3a6 (diff) | |
| download | www-andreasbaumann-cc-d232766ed6499c7d271cd50074a89695259cc77e.tar.gz www-andreasbaumann-cc-d232766ed6499c7d271cd50074a89695259cc77e.tar.bz2 | |
updated IMC-2001 status
Diffstat (limited to 'content')
| -rw-r--r-- | content/hardware/imc-2001.md | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/content/hardware/imc-2001.md b/content/hardware/imc-2001.md index 0f98ef2..78ef2b4 100644 --- a/content/hardware/imc-2001.md +++ b/content/hardware/imc-2001.md @@ -19,14 +19,11 @@ Trying to fix several issues: - the CRT shows some flickering and diagonal effects. Testing on an old TV shows the same issue (so I suspect it's some grounding/shielding issue with the new PSU). -- the lever moving the contacts between 40-character and 80-character - mode for the CRT output is corroded, doesn't always make contact - and produces a flickering image - the CRT is producing some flickering when turning the brightness nob, this should be fixable with some deoxit. -- keyboard cable is broken, at least the data line - the paddle and the joystick connectors miss some legs for putting them into the sockets on the motherboard +- paddle 0 seems to be a little bit shacky (the button works unreliably) - the second floppy drive (the more used one) now sees floppies always as "write protected". Diagnostic tests show alignment issues of the drive, this could be true, or the clone always had a different alignment than a default @@ -35,6 +32,11 @@ Trying to fix several issues: Fixed issues: +- ~~the lever moving the contacts between 40-character and 80-character + mode for the CRT output is corroded, doesn't always make contact + and produces a flickering image~~. The box is heavily sealed and there + is no easy way to fix it. Using an audio switch box for switching modes now + (the cables are standard audio-like cinch connectors). - ~~the floppy drives read floppies (both) but they don't write to floppies (when copying in CP/M or creating a file), they work when formatting a drive on CP/M though. ~~Could be a side-effect of the PSU not working properly.~~ @@ -84,7 +86,8 @@ Not fixed issues: Known things to work: -- The keyboard works electronically (8039 MCS-48 like CPU with a 2K EPROM) +- The keyboard works electronically (8039 MCS-48 like CPU with a 2K EPROM), + has a new serial cable now and is fully functional - the Rockwell R6502 CPU has a phase 0 clock and seems to go through address lines and output data (another strong indicator is the 'Apple \]\[' sign on the monitor when switching on which indicates 6502, 40-character |