11/04 Project

[Henk Gooijen]

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-bounces at classiccmp.org> namens John Welch via cctech <cctech at classiccmp.org>
Verzonden: Wednesday, December 13, 2017 7:23:01 PM
Aan: cctech at 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