Hi all,
Who else owns one of these development systems? Herb Johnson and I have
been dumping the ROMs of our two systems, only to discover a lot of partial
(and one total) erasure of our 1702As. My ROMs have lacked a sticker over
the window since it left the Intel factory, but only one of them is
completely erased, or perhaps it's defective. But there are many other
inconsistencies in our ROMs, hinting at possible partial erasure over time.
Herb has been writing up some of our discussion and findings here:
http://www.retrotechnology.com/restore/intl4_roms.html
It would be great to get some others with these systems to dump the ROMs.
The listing for the monitor for the 8 MOD 80 is available, if I recall, but
not for the 4 MOD 40.
It's only a 2kB monitor, so it would be very limited on what it could do.
My guess is that it could talk with a teletype and do some basic reading of
paper tape into RAM. One thing to note is that the entire asynchronous
translation is done without a UART! The 4040 decodes it directly by reading
and writing from two pins on two different ports for keyboard and printer,
and a third pin on a third port for reader run. That certainly takes some
software to control.
If anyone could help Herb and I out, we would appreciate it greatly.
Kyle
W4GNU