24 Feb
2013
24 Feb
'13
9:36 a.m.
On Feb 24, 2013, at 11:50, Dave McGuire <mcguire at neurotica.com> wrote:
Maybe reverse-engineer the oscillator wrapped around
that 24MHz
crystal, then see where it goes. Compare that with the pinout of the
8048...if it goes to pins 2 or 3, that further suggests that Mr. 4430030
may be an 8048.
You (Nigel, not Dave) mentioned that you didn't think it was a
microcontroller because there's no ROM nearby. Don't put too much
weight on that, because the 8048 has an on-chip ROM.
I was gonna say... My recollection is that the 8048 is
the masked rom variant in that family. It wouldn't surprise
me to see one with a house part number, given that
(though I know at least a few old Epsons that had
8048s for the parallel controller and didn't bother re-
marking them).
- Dave