H89 CP/M hard-secored boot diskette

From: Dwight K. Elvey <dwightk.elvey_at_amd.com>
Date: Thu Apr 3 15:34:00 2003

>From: ard_at_p850ug1.demon.co.uk
>> MTR-90 is in the ROM on the 89's CPU board. My MTR-90 manual indicates
>> It certainly seems as if you can run both controllers in one machine.
>You most certainly can. My Z90 (essentially the same machine -- AFAIK the
>differences are that it came fully assembled ('Z', not 'H'), and came
>with 64K RAM, has MTR-90, the hard sector controller and the
>double-density soft sector controller. The former is cabled to the single
>built-in drive, the latter to an external drive box.
>It will boot either HDOS or CP/M, and can use both types of disks

 The Z90 is built to be 64K a H89 isn't. As far
as I recall, the H89 took more than a simple jumper or
switch to make it CP/M compatable.
 Also, one should note that HDOS came in both hard and soft sectored.
Received on Thu Apr 03 2003 - 15:34:00 BST

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