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authorAndreas Baumann <mail@andreasbaumann.cc>2022-11-03 08:32:04 +0100
committerAndreas Baumann <mail@andreasbaumann.cc>2022-11-03 08:32:04 +0100
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+A (not so curated) list of old hardware I own:
+
+- [IMC-2001](/hardware/imc-2001): Taiwanese Apple \]\[ / CP/M clone
+
+
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+
+# IMC-2001
+
+This is an old Taiwanese Apple \]\[ / CP/M clone.
+
+# Status
+
+Trying to fix several issues:
+- power switch makes some hissing noises
+- the lever moving the contacts between 40-character and 80-character
+ mode for the CRT output is corroded, doesn't always make contact
+ and produces a flickering image
+- keyboard cable is broken, at least the data line
+- the paddle/joystick connectors miss some legs for putting them into
+ the sockets on the motherboard
+- possibly much more
+
+Known things to work
+
+- The keyboard works electronically (8039 MCS-48 like CPU with a 2K EPROM)
+- the Rockwell R6502 CPU has a phase 0 clock and seems to go through
+ address lines and output data (another strong indicator is the 'Apple \]\['
+ sign on the monitor when switching on which indicates 6502, 40-character
+ ROM, video circuit seem to be just fine).
+
+# Images
+
+From the outside:
+
+{{< figure src="/images/hardware/imc-2001/computer_full.jpg" alt="IMC-2001" >}}
+
+The motherboard and floppy drives:
+
+{{< figure src="/images/hardware/imc-2001/motherboard_internal.jpg" alt="IMC-2001" >}}
+
+Keyboard layout:
+
+{{< figure src="/images/hardware/imc-2001/keyboard_front.jpg" alt="keyboard layout" >}}
+
+Keyboard has a 8039 CPU inside and a 2K EPROM:
+
+{{< figure src="/images/hardware/imc-2001/keyboard_pcb_controller_prom.jpg" alt="PCB and controller" >}}
+
+On the oscilloscope:
+
+{{< figure src="/images/hardware/imc-2001/oscilloscope_serial_keyboard.jpg" alt="serial keyboard signal" >}}
+
+# Documentation
+
+Documentation will be scanned (the little I have), for now the most
+important pages are avaiable here:
+
+Frontpage:
+
+{{< figure src="/images/hardware/imc-2001/manual_frontpage.jpg" alt="manual frontpage" >}}
+
+ASCII keyboard table:
+
+{{< figure src="/images/hardware/imc-2001/manual_ascii_table.jpg" alt="keyboard ASCII table" >}}
+
+keyboard protocol and connectors:
+
+{{< figure src="/images/hardware/imc-2001/manual_keyboard.jpg" alt="keyboard protocol and connectors" >}}
+
+Layout of the chips on the motherboard:
+
+{{< figure src="/images/hardware/imc-2001/manual_motherboard.jpg" alt="motherboard layout" >}}
+
+# Links
+
+* [Mention of the IMC-2001](http://www.epocalc.net/php/liste_models.php?texte=&look=All+fields&yearmax=2018&nocomp=pc&cat=Apple+2+clone):
+ mentions it on the list of Apple clones
+* [Youtube video of similar machine](https://www.youtube.com/watch?v=c7crlJg80Zg):
+ "APPLE II CLONE + CP/M ------- IMC 2001 made in taiwan.--------", Retro Computacion Argentina Jorge E. Nuviola