[sebhc] RE: H8 tapes for Dave - archiving tapes?

Dwight K. Elvey dwight.elvey at amd.com
Thu Jul 8 17:09:14 CDT 2004

Hi Carroll
 You can probably run both boards. The HDOS does
go out and check to see which board you have. I
don't know if there is any order or if it is just
which board the HDOS finds first. You might experiment.
 I've not looked at the CP/M. I'd expect it to be configuable.
You should jumper the H8-5 for something less than
9600. Because of what we were seeing with the image
transfer program, I'd say it was running right on
the edge. I'm thinking of adding an option to set the
baud rate for those that only have fussy H8-5's to
talk to.
 For those that are expecting to put the CP/M on their
system, you'll need a system with the XCON8 and the Z80
board or there was a memory mapping board that went
into the last slot that would allow zero mapped memory.
 Does anyone have the schematic for that card ( I forget
what it is called )?

>From: "Carroll Waddell" <CarrollWaddell at sc.rr.com>
>Just looking over some old emails.
>On my H8, I have both an H8-4, H8-5, and H17 controller. I can run CP/M, 
>HDOS, or tape software. The only thing I have to do is connect the H19 
>terminal to the H8-5 board for tape software, or to the H8-4 board for 
>disk software.
>Lee Hart wrote:
>>Dwight K. Elvey wrote:
>>>I remember that you can have the tape card or the floppy
>>>card but not both because of a port overlap. This should
>>>be similar for the H8.
>>Heath had two I/O decoder ROMs for the H89. The early one (444-43)
>>decoded I/O addresses for the hard-sector controller board (H88-1),
>>3-port serial board (H88-3), and the cassette board (H88-5).
>>The later one (444-61) decoded I/O addresses for all 4 disk controller
>>boards (H17, H37, H47, and H67) and the 3-port serial board, but *not*
>>the cassette board.

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