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authorAndreas Baumann <mail@andreasbaumann.cc>2022-11-23 20:36:15 +0100
committerAndreas Baumann <mail@andreasbaumann.cc>2022-11-23 20:36:15 +0100
commit7e7939ef96f768d43c337e4df1ab80db4d9351a5 (patch)
treeb9e732c361457870f9702b6735b7b8386f721805
parenta41e46e27232be075fc0650021064689d89f83db (diff)
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updated IMC-2001 entry
-rw-r--r--content/hardware/imc-2001.md12
1 files 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