[sebhc] H8 configuration

Dwight K. Elvey dwight.elvey at amd.com
Thu May 27 21:48:21 CDT 2004

 You may have a problem reading the XCON8 on a programmer.
They are using pin 21 as a CS so A11 has to be on one
of the other pins for the ROM. I've only been able to dump
the lower part of the ROM with the 2732 setup ( vpp=5 )
as the higher half of the 4K dump. The lower half reads
0ffh's. You may have to play with which line is A11.
It does have the H17 code on it because I can clearly
see it on my H8.
 Anyway, the H17 rom image is on the web site. You can
just load that file into a 2716. That that you have from
years ago should be the same as well.

>From: "Carroll Waddell" <CarrollWaddell at sc.rr.com>
>I found some 2114's in my OLD STUFF drawer a little bit ago. The XCON8 
>ROM may have the H17 code on it. If not, I'll try burning an EPROM. I 
>still have the H17 ROM code from years ago.
>Dwight K. Elvey wrote:
>>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
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