In January I started building another set of built-in bookcases (like a made a few years ago). This set is for some of my daughter's books. Unfortunately I with the lock down it took some time to get the wood I needed. I finally was able to finish this off today.
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I purchased this Matt Millman's 2708 programmer shield (unpopulated) for the Arduino Mega 2560 R3. This allows me to program 2708 chips, something I cannot do with any other programmer I own. It will actually program 2704 / 2708 / TMS2716 / MCM68764 and MCM68766 EPROMs. The only one it will not program is the 1702 / 1702A. However, Matt has a board for that too. Unfortunately, that board is nearly made entirely of surface made components, so it would be tricky to put together.
As you can see, the EPROM I am programming here is for my Ithaca Audio Floppy Disk Controller. The Commodore US*1M is a follow-on calculator to the Commodore US*1 (their entry-level calculator), with a basic accumulating memory register functionality. The US*1M was introduced in the latter part of 1973. The calculator I have used a planar gas-discharge display, and a set of Western Digital ER1422B and ER1432B calculator chips with date codes in 1973.
Finally got all the components for this IA-2020 Floppy Drive Controller board. Now all I need to do is program a 2708 EPROM with the appropriate code. I am currently looking for a BIN or HEX file of the Ithaca Audio FDC-II (IA-2020) code. It would fit on a 2708 EPROM.
My 2102 SRAM Tester PCBs have arrived from China. Had the test setup for the Arduino based 2102 SRAM Tester made into a PCB shield for the MEGA. If you are interested in buying one, check out my link here. The idea is based on Martin Lukasek's "Simple Arduino SRAM tester".
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AuthorCharles Baetsen holds a Bachelor and a Master's degree in Engineering Physics from McMaster University in Hamilton, Canada. Archives
February 2024
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