Hacking a Cossor (Raytheon) Husky Printer

Trying to find details of "the main chip".... ironically one of my top Google hits was this very project on HackADay. :/

I've found a Chinese reseller that's selling "the main chip" https://www.jotrin.com/product/parts/LA_180D so, at least, we now know it's designation.

There was a promise of a datasheet at the above address but after they got me to create an account (probably just a way to obtain my E. mail address for spamming), The promised datasheet link just takes you to Panasonic's website.

But at least now we know that it's a Sanyo LA-180D. Although http://www.showadenshisangyo.co.jp/import_csv/stocks/10001-450.html seems to think it was manufactured by Oki.

There's a lot of traces under the chips too.

I'm thinking that if I don't succeed in getting it working. I might strip the board right down, so that you can have an image of the front of the board without having to trash one for yourself.

Here's the back of the board too.

The "big chip"... Possibly a custom chip just for this device. I've not found any details as yet.

The "smaller chips"... Plenty more details on these:

INTERSIL ICL7642ECPD - S8936 - Dual/Quad, Low Power CMOS Operational Amplifiers
MAXIM MAX232CPE - RS-232 --> TTL converter https://en.wikipedia.org/wiki/MAX232
74HC14N - Hex Schmitt-Trigger Inverters
74HC02N - Quad 2-input Positive-NOR gates

LA-180D 46 062028 ( https://hackaday.io/project/168472-hacking-a-cossor-raytheon-husky-printer/log/183787-identified-the-main-chip-still-no-datasheet-though )

That Maxim chip looks like a good place to tap in a serial port at either RS232 or TTL voltage.