H89 CP/M hard-secored boot diskette

From: Patrick Rigney <patrick_at_evocative.com>
Date: Thu Apr 3 11:33:00 2003

> MTR-90 is in the ROM on the 89's CPU board. My MTR-90 manual indicates

Wayne, oh yeah, that I know. But there seem to be several revisions at
work. I have two (currently dead) '89s that both have part number 444-62 at
U518, which I understand from another enthusiast is MTR-89, and will not
support the H-37 controller (or at least, it will not boot from it). My
working machine, however, has 444-142, which is apparently MTR-90 and OK for
that controller. I've also been warned by this person that I can burn my
own copies of 444-142 for those other machines, but I have to watch the
voltage settings (jumpers) for the EPROM socket *very* carefully.

> They're all short so let me know what
> you need.

Thanks for the jumper positions, that's a huge help. I'll contact you
off-list regarding the docs. A further question if you know: the H-17 seems
to require the right-most "slot" on the CPU board (different signals from
the other two). The serial card is in the middle slot, so I assume the H-37
can go into the left slot? Also, my H-37 card has a ribbon cable coming off
at "P5" on the board and terminating in a DIP header, which I assume
connects to the CPU board, but where, and does something else get pulled to
make room for it (like the 64K memory expansion hack)?

> The controller manual says that you need either HDOS version
> 2.0 (with update HOS-5-UP) or CP/M version 2.2.03 or higher.

I have HDOS 2.0, but I'll have to scrounge to see if I have that update.
Thanks (very much) to Don Maslin, I have a CP/M, will need to check the
version.

Thanks for the assist!
Patrick
Received on Thu Apr 03 2003 - 11:33:00 BST