updated IMC-2001 status

1 files changed, 18 insertions, 3 deletions

diff --git a/content/hardware/imc-2001.md b/content/hardware/imc-2001.md
index 7444f6e..1060f1b 100644
--- a/content/hardware/imc-2001.md
+++ b/content/hardware/imc-2001.md
@@ -13,12 +13,18 @@ Trying to fix several issues:
 - 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..
-- the floppy driver read floppies (both) but both don't write to floppies
+- 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. Could be a side-effect of the PSU not working properly.
+  a drive on CP/M though. ~~Could be a side-effect of the PSU not working properly.~~
+  The PSU has been replaced, the voltages look ok, so I rule out the PSU.
+  Could be some missing code in the Apple ROM (but that would be weird to
+  call 6502 firmware code from the Z80 CPU). It could also be the write
+  current being to low for writting (but why does formatting a drive work then?!)
 - 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
+- the CRT is producing some flickering when turning the brightness nob,
+  this should be fixable with some deoxit.
 - 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
@@ -26,11 +32,14 @@ Trying to fix several issues:
 
 Fixed issues:
 
+- Reseated and deoxied all ICs, some of them were quite corroded, at
+  least 3 more turned out to be bad. Sadly it didn't have an effect on
+  ROM 1 not getting hot (must be something else).
 - ~~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 new replacement power supply works like a charm, also replaced
-  the switch, as it was also unreliable
+  the power switch, the old one was too unreliable.
 - ~~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
@@ -56,6 +65,7 @@ Known things to work:
   as the keyboard works and the CP/M on the 80-character card I can also
   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.
   
 # Images
 
@@ -106,6 +116,11 @@ This is the "Operation Manual for IMC-2001, version 2.01":
 [The complete scanned manual](/hardware/imc-2001/manual_imc_2001_2.01.pdf)
 (also on archive.org, see [https://archive.org/details/manual_imc_2001_2.01](https://archive.org/details/manual_imc_2001_2.01))
 
+# Super Serial Card
+
+I got a super serial card from Ebay, the documentation of it can be
+found here [https://archive.org/details/Apple_II_Super_Serial_Card_1981_Apple](https://archive.org/details/Apple_II_Super_Serial_Card_1981_Apple).
+
 # Schematics
 
 Power connector on the motherboard: