24 Feb
2013
24 Feb
'13
1:24 p.m.
On Mon, Feb 25, 2013 at 3:50 AM, Dave McGuire <mcguire at neurotica.com> wrote:
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.
good point Dave. I think I was indoctrinated as I spent the day
sorting QBUS modules (from a similar era) and was seeing CPUs with
external masked ROMs/EPROMs, when I sat down later to look at the
Displaywriter, I had forgotten all about the 8-bit MCUs with on-board
ROM.
Allison made an interesting point of the inability of an 8-bit MCU
participating in the data stream due to lack of performance.
There are two cables exiting the 6360 to connect back to the main
system unit (6580), one cable has 14-pins, another has 16-pins.
TonyD: not traced the PCB yet, it is one of those IBM grid layouts so
everything is jammed next to each other. If I get brave I will remove
the board and look on the back to see if the traces are visible.