Jumping over the settings. They seem OK, as you get the AB in Hyperterm.
That 777564 shows 000200 is also correct (as I remember that): it indicates
“transmit buffer empty”.
You can also try it the other way:
* type one character in Hyperterm
* check that 777560 has the receiver buffer full flag set (000200)
* in 777562 you will see the typed character (in octal)
773024 showing 165024 rings a bell. IIRC, 165024 is the start address of the
monitor on the M9312.
That is the PROM “in the middle” on the board.
I think that if you enter CLR, 165024 LAD, CTRL/START you will get the “@”.
BTW, there is a second start address. One does some diagnostics, the other does
not.
My guess that on 773000 and you getting 773002 on the display means that you
try to boot
from a “device” that is specified in one of the four PROMs, but the PROM socket
is empty …
________________________________
Van: cctech <cctech-boun...@classiccmp.org> namens John Welch via cctech
<cct...@classiccmp.org>
Verzonden: Wednesday, December 13, 2017 7:23:01 PM
Aan: cct...@classiccmp.org
Onderwerp: 11/04 Project
I am back in front of the machine:
The M7856 is set thusly:
1 2 3 4 5 6 7 8 9 10
-- -- -- -- -- -- -- -- -- -- --
S5 DN DN DN UP DN DN UP DN DN UP
S3 DN DN UP DN UP UP DN UP DN UP
S1 UP UP DN UP DN DN UP UP DN UP
S4 UP UP DN DN UP UP DN DN DN UP
S2 DN DN UP DN DN UP DN DN -- --
The M9312 is set thusly:
1 2 3 4 5 6 7 8 9 10
-- -- -- -- -- -- -- -- -- -- --
S1 UP UP DN DN DN DN UP DN DN DN
This should be 300, 8, Odd, 1
I have what I think is null modem between the M7856 cable and a PC
running XP with Hyperterm set to 300, 8,O,1
Troubleshooting from the programmers console:
CNTRL plus HALT, no bus hang.
CLR, 777566, LAD, 101, DEP, Hyperterm shows: A
CLR, 777566, LAD, 102, DEP, Hyperterm shows: AB (the B popped up next to
the previous A )
CLR, 777564, LAD, EXAM, display shows: 000200
CLR, 773024, LAD, EXAM, display shows: 165024
CLR, 773024, LAD, EXAM, display shows: 165024
CLR, 773000, LAD, CNTRL plus START, console says: 173002
I am thinking that the Hyperterm should be seeing an "@" and I should be
able to boot from there.
Any thoughts?
Sincerely,
John Welch
