Sword7 wrote:
Today I found Star Micronics NX1000 series technical manuals on manualslib website. [...]
It said that it uses m50734sp processor (6502-based microcontroller) with 64K EPROM chip. [...]
Does anyone have a copy of M50734SP user manuals? [...]
Thanks,
Tim
That's MELPS 740 family. And it was not only Star that used them (I mean, 6502 derived MCUs from Mitsubishi) - I remember seeing them in some photocopiers and printers when I was working in a printer workshop in mid 90's. Mita (before Kyocera bought them) even had laser printer(s) based on some more recent 740 (or maybe MELPS770 ?) family MCU.
Star LC100c that was my first printer also used some MELPS740 MCU (possibly the same); I acquired (yet another) Star XB24-250 recently (24 pin, colour, A3) and guess what is there ?
Bitsavers and Datasheet Archive have lots of datasheets, see e.g.
https://archive.org/details/bitsavers_mitsubishihttps://www.datasheetarchive.com/%22SER ... sheet.html