[sebhc] H8 configuration

Dwight K. Elvey dwight.elvey at amd.com
Thu May 27 19:38:08 CDT 2004

Hi Carroll
 The ROM can just be a 2716 with code from the site as I recall.
I don't think you need any special mods to use the 2716's.
I think Anchor Electronics still has 2114's. There are also
some board modifications that you'll need to make. Look at
the pdf for the XCON8 to see what was modified ( I think it
is just a jumper or two and a cap/resistor ). You need to
undo these modifications as your board was configured
for the XCON8 setup and not the PAM8( unless, of course that
is what you have ). If you have the Z80 board you don't need
either the ROM or RAM chips.
 I suspect that HDOS will find the serial port, it is just that
my code is a complete bootstrap. My code runs before any
thing else runs so I needs to initialize the serial port
and specifically talk to it. It is not an application
that runs under HDOS. The ROM only has code to talk to
the cassette, not the serial.
 Remember, this is a bootstrap from ground zero. I do have
code to write out the main code that I use for bootstrapping
to the disk but, again, this is not a HDOS disk. It is
just a disk that boots to the transfer program. I don't get
all the HDOS calls to play with. This way, one only needs
to enter the bootstrap code once from the front panel.
 Thanks for the port info.

 How many people out there have a PAM8 with the disk connected
and running? What does your setup look like?

>From: "Carroll Waddell" <CarrollWaddell at sc.rr.com>
>I'm working on the same configuration, but I plan to have both the H8-5 
>and the H8-4 in the machine. The cassette interface is port 370Q, the 
>H8-5 terminal address is 372Q, and the H17 is 170Q-174Q. You can remove 
>the 8251 on the cassette board to disable the interface.
>I'm pretty sure that if you don't have an H8-4, the software will use 
>the 372Q port on the H8-5. The H17 board that I bought was missing the 
>H17 ROM and the 2114 memory chips. When I locate them, I'm going to set 
>up a similiar system.
>Dwight K. Elvey wrote:
>> I'm going to be setting up my older H8 to have the
>>H17 board installed. The problem is that this machine
>>has only the serial/cassette board ( H8-5 ) and not
>>the H8-4 serial board. Is this configuration possible?
>>I know that on the H89, the cassette and H17 are on
>>conficting addresses. Can one configure this older
>>setup to run without using the H8-4 board? Is there
>>a way to share or disable the cassette address on the
>>H8-5 board?
>>Delivered by the SEBHC Mailing List
>Delivered by the SEBHC Mailing List

Delivered by the SEBHC Mailing List

More information about the Sebhc mailing list