From 7e7939ef96f768d43c337e4df1ab80db4d9351a5 Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Wed, 23 Nov 2022 20:36:15 +0100 Subject: updated IMC-2001 entry --- content/hardware/imc-2001.md | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/content/hardware/imc-2001.md b/content/hardware/imc-2001.md index 1fca25c..80b9c01 100644 --- a/content/hardware/imc-2001.md +++ b/content/hardware/imc-2001.md @@ -14,12 +14,14 @@ Trying to fix several issues: 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/joystick connectors miss some legs for putting them into +- the paddle and the joystick connectors miss some legs for putting them into the sockets on the motherboard -- sometimes I get into the monitor, lower-nibble bit 3 of the key +- 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. + 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) - possibly much more @@ -33,7 +35,9 @@ Known things to work ROM, video circuit seems to be just fine). - Monitor is working just fine (which is sort of amazing for such an old CRT monitor). -- I can boot from a Apple \]\[ CP/M 56k floppy and I get a prompt. +- I can boot from a Apple \]\[ CP/M 56k floppy and I get a prompt, now + as the keyboard works and the CP/M on the 80-character card I can also + assume the Z80 is working just fine. # Images -- cgit v1.2.3-54-g00ecf