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| author | Andreas Baumann <mail@andreasbaumann.cc> | 2023-04-08 17:19:56 +0200 |
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| committer | Andreas Baumann <mail@andreasbaumann.cc> | 2023-04-08 17:19:56 +0200 |
| commit | d06070ac8db8536fb3138e845e2e5e5baac6d58f (patch) | |
| tree | e0a4ebd4a1f9d74aa883b15e4df5e5246c5eb762 /content | |
| parent | e970f0d6a0d21321370a8de5b0c5bd0f992d52ac (diff) | |
| download | www-andreasbaumann-cc-d06070ac8db8536fb3138e845e2e5e5baac6d58f.tar.gz www-andreasbaumann-cc-d06070ac8db8536fb3138e845e2e5e5baac6d58f.tar.bz2 | |
updated IMC-2001 project status
Diffstat (limited to 'content')
| -rw-r--r-- | content/hardware/imc-2001.md | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/content/hardware/imc-2001.md b/content/hardware/imc-2001.md index cd7e6a6..28c3f5f 100644 --- a/content/hardware/imc-2001.md +++ b/content/hardware/imc-2001.md @@ -9,22 +9,28 @@ This is an old Taiwanese Apple \]\[ / CP/M clone. # Status Trying to fix several issues: -- power switch makes some hissing noises +- power switch made some hissing noises, it was not the switch, now + the original power is dead (and some transformers are humming). Ordered + a Apple 2 replacement PSU, waiting for it.. - 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 - 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 -- sometimes I get into the monitor +- ~~sometimes I get into the monitor~~ - ~~lower-nibble bit 3 of the key being pressed is missing, unclear where it is lost, I suspect a bad register on the motherboard holding the current ASCII value of the key pressed or something similar~~. Replaced a bad 74LS257N, works now just fine. - ROM 1 with BASIC is broken (and gets really hot). This explains - the booting issues.. (will be tricky to get a replacement) + the booting issues.. (will be tricky to get a replacement). The + board layout doesn't fit to the original ROM sizes too.. - possibly much more +- the floppy driver read floppies (both) but both don't write to floppies + (when copying in CP/M or creating a file), they work when formatting + a drive. Could be a side-effect of the PSU not working properly. Known things to work |