11 Jul
2007
11 Jul
'07
5:49 p.m.
Tony Duell wrote:
...
I need service
docs for an Akai AX60. It uses a microprocessor (D7811)
that I am not familiar with, and it seems to have a scrambled brain.
I've come
across the 7811 in Canon laser printer engines, It's an 8-bit
microcontroller The bad new is that AFAIK it only exists as a
mask-programmed device,
there's no EPROM or OTP version. There is the 7810, which is the ROMless
equivalent (you use some of the I/O ports as an address/data bus for
external program memory, something in the back of my mind says the bus is
8085-like, with the data multiplexed ont he low 8 address lines).
I've seen a 7810 recently in the battery capacity meter circuit
of the City-El electric bubble car:
http://www.flickr.com/photos/anachrocomputer/551136316/
I think I found out a bit about it from the NEC data sheet, which
seemed to show that it was a Z80 CPU and some peripherals, including
an A-to-D converter.
--
John Honniball
coredump at gifford.co.uk