11/04 Project

[Noel Chiappa]

    > From: John Welch

    > Anyway, 'a' comes over as 000141 and 'A' comes over as 000101.

Good, the console is working.


    > CLR
    > LAD
    > DEP

OK, that loads a '0' (halt) in 0.

    > CNTRL+INIT
    > CNTRL+START -> reads 000002

OK, so it reads the HALT at 0 and stops.


    > CNTRL+BOOT -> Run light is on, SR Disp light is on
    > CNTRL+HLT reads 173150

Sounds like it may be looping in the high bank of ROM? That's not necessarily
wrong.

I finally figured out what the ROMs in the M9312 do; the ROMs at 765000 are
the first-level diagnostic, and the console. The bootstrap code for the
various devices is at 773000.

    > 773024 LAD, 773000 DEP, BUS ERR light comes on.

That makes sense; you can't write to the ROM.


    > Any suggestions?

i) Check the ROM contents; there are two kinds of M9312 console ROMs, one for
most CPUs, and one for the 11/60 and 11/70, see the tech manual for the
M9312.

So read out the first couple of words:

  CLR
  765000
  LAD
  EXAM
  EXAM
  etc

and let's see what they read.

ii) Try starting the console code directly:

  CLR
  765020
  LAD
  CNTRL+START

    > I have other M9312s I could try.

Can't hurt.

	Noel