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| author | Andreas Baumann <mail@andreasbaumann.cc> | 2023-05-16 20:49:56 +0200 |
|---|---|---|
| committer | Andreas Baumann <mail@andreasbaumann.cc> | 2023-05-16 20:49:56 +0200 |
| commit | 4c24c672cde963f9566d94defd6c97164fad80c5 (patch) | |
| tree | b9ac75d8c910d35f18e00c291204db2fdff3a259 /content | |
| parent | 206cddd3ac9d007e99b70d848d330498c7aa662c (diff) | |
| download | www-andreasbaumann-cc-4c24c672cde963f9566d94defd6c97164fad80c5.tar.gz www-andreasbaumann-cc-4c24c672cde963f9566d94defd6c97164fad80c5.tar.bz2 | |
updated IMC-2001 status
Diffstat (limited to 'content')
| -rw-r--r-- | content/hardware/imc-2001.md | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/content/hardware/imc-2001.md b/content/hardware/imc-2001.md index 5aea3e9..3524717 100644 --- a/content/hardware/imc-2001.md +++ b/content/hardware/imc-2001.md @@ -10,6 +10,11 @@ This is an old Taiwanese Apple \]\[ / CP/M clone. 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). +- floppies written read/written with Fluxengine don't really work either + on the real hardware or the emulator. Suspecting a encoding/decoding issue. - 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.~~ @@ -28,12 +33,14 @@ Trying to fix several issues: - the paddle and the joystick connectors miss some legs for putting them into the sockets on the motherboard - possibly much more -- the keyboard reset line cannot be taken to ground on the keyboard, works - with shrtening ground and reset though just fine. Must be a bug on the - ICs of the keyboard controller or a broken trace. Fixed issues: +- ~~the keyboard reset line cannot be taken to ground on the keyboard, works + with shrtening ground and reset though just fine. Must be a bug on the + ICs of the keyboard controller or a broken trace.~~ Fixed with a botch + to bridge the broken ribbon cable between keyboard matrix and the PCB with + the controller logic. - ~~ROM 1 with BASIC is broken (and gets really hot). This explains the booting issues.. (will be tricky to get a replacement). The board layout doesn't fit to the original ROM sizes too..~~ @@ -75,6 +82,7 @@ Known things to work: assume the Z80 is working just fine. - the 80-columns card (a Videx Videoterm or rather a clone of it) works just fine. - the highres graphic mode works just fine, I can run "Peter Anvin Chess" and play it. +- Applesoft BASIC works fine # Images |