From d06070ac8db8536fb3138e845e2e5e5baac6d58f Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 8 Apr 2023 17:19:56 +0200 Subject: updated IMC-2001 project status --- content/hardware/imc-2001.md | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'content') 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 -- cgit v1.2.3-54-g00ecf