[sebhc] Hello to all H-8 Users!

Dwight K. Elvey dwight.elvey at amd.com
Fri Jun 4 11:55:01 CDT 2004

>From: "Collado, Norberto" <norberto.collado at hp.com>
>Hello Ron,
>	If I recall properly my H-8 was booting CP/M and H-DOS from the
>10 meg hard drive. It was using the SASI interface card from Heathkit to
>a controller than converted from SASI protocol to MFM format. SASI was
>replaced by SCSI. An alternate option will be to find a converter from
>ux-mac-addonics-adaec7726h-shopping.htm) and update H-DOS or CP/M to
>handle it. 
>	I think it will be easier to use your design. If you can use a
>single PAL for your design that will be great!  I will loved  to upgrade
>to an IDE to keep the system going, because eventually my MFM disk drive
>will stop working and then will be back to floppies again. I will need
>to put together my H-8 to give you more information and changes we did
>back them to the OS to support the MFM 10 Meg hard drives.

 One might consider taking a MFM controller card from old
XT machines and making a simple adapter to the H-8 buss.
I did something similar for my NC-4000 processor board
( A Forth chip ). These controllers need no interrupts
or 8 to 16 bit registers like the IDE needs. The control
code is almost identical to the IDE that was for the
most part an extension of the MFM controllers. Most
have EPROM sockets if one wanted to have boot code
and such.

>-----Original Message-----
>From: sebhc at sebhc.org [mailto:sebhc at sebhc.org] On Behalf Of West, Ronald
>Sent: Friday, June 04, 2004 10:12 AM
>To: 'sebhc at sebhc.org'
>Subject: RE: [sebhc] Hello to all H-8 Users!
>Collado, Norberto said:
>>     I still have my H-8 and last time it was power-up was in
>> 1986 after moving from Puerto Rico to Framingham, MA and it 
>> has all the improvements that I mentioned; plus a 10 Meg had 
>> drive which I will love to upgrade to an IDE drive if someone 
>> has done it. Once I unboxed my H-8 I will let you know what 
>> goodies I still have.
>I looked at the super buffer board and that is way cool. You mention
>above that you had a 10 Meg drive attached also. What O/S was used to
>access that drive? Was HDOS able to see and use the whole thing?
>I am currently working on an IDE interface for the H-8. Development has
>been slow for a while due to other things going on. Trying to use
>original design techniques and the same logic used on the original
>boards to keep it close to what might have come out of Benton Harbor
>(not sure if that has a lot of value but it sounds good <wink>). Thought
>of using a PAL to decrease the number of IC's on board but I know most
>folks don't have the means to program one of those, so am sticking to
>discreet IC's and will see what the chip count is when I am done. 
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