| website | http://revenant1.net |
| website 2 | https://tcrf.net |
| pronouns | any |
| intro | https://mastodon.social/@revenant/98954198754723592 |
last week i picked up this 1989 Z80-based "GALPRO" PLD programmer from the Japanese company "R&D Co., Ltd." which is such a generic company name that it's basically impossible to find any information online about either the company or their products
naturally first thing i did was get it running as a preliminary MAME driver (shown here with its default ASCII-only terminal) including some debug logging for controlling the target PLD's pin states, programming voltage, etc.
http://www.pc-6001.net/p6/hard/6022repair.html well i found a page covering someone repairing one that helpfully has a photo that confirms that this was indeed where the chip came from
i've gone ahead and thrown together a skeleton MAME implementation of it now (it doesn't _actually_ print, but it "works")
as a followup to my NEC uPD7811 series ROM reader i built last year, i decided to try a counterpart for the even older uPD7801
there's no mode pins for disabling/enabling internal memory this time, but i tried to design a simple clock glitching attack to force booting into external ROM, and it works! (albeit somewhat tempermentally)
first random chip from ebay turns out to be from the Casio FP-1000 computer, which was already dumped via other methods, but i have another one to try later
endrift 🏳️⚧️