[sebhc] H-89 bus pin out Help

Dwight Elvey dwight.elvey at amd.com
Tue Mar 14 12:47:45 CST 2006

Hi Joe
 There are two different busses. I think your looking
at the memory expansion buss, not the I/O buss from
the mother board. Please take another look at the schematic.

>From: "Joe Smith" <bandit1921 at cox.net>
>Depends on what you are looking at, I took those from the CPU 
>Board,because looking at the H17 and Serial I/O used 2 different 
>names,pins are different.
>At 10:24 AM 3/14/2006 -0800, you wrote:
>>  I don't think the pins you've labled are correct. As I recall
>>only A0, A1, A2 and maybe A3 were on the I/O buss.
>>The mother board decoded a number of blocks to the I/O
>>boards on some of the other pins. I don't think the
>>entire address were there through A12. Pin11 is the
>>select line for the floppy block of I/O.
>>  Also, I think pin 6 is BRD_L and 7 is BWR_L not address
>>lines. Pin 13 is the clock line ( 2.048MHZ ).
>> >From: "Joe Smith" <bandit1921 at cox.net>
>> >
>> >Here is a little text file from what I see on my Schematic, if you
>> >look at the H17 Floppy connectors and the serial I/O connectors it
>> >says different things,this is a combo of those and what it shows for
>> >them on the CPU board.
>> >At 04:53 PM 3/14/2006 +0000, you wrote:
>> >>Bill Malcolm wrote:
>> >>>Hi: All I did not see the H-89 BUS Pin out in the archive files  (
>> >>>for the slot card).
>> >>
>> >>The schematic for the floppy controller only identifies the pins
>> >>that it uses, but it might be enough.
>> >>
>> >>http://www.sebhc.org/archive/documents/hardware/HZ89/H-88/H88-1-sc 
>> hematic.pdf
>> >>
>> >>It doesn't look like we have the schematic pull-outs for the H88/89
>> >>manuals in there yet.  I'll keep an eye out for some during my cleanup.
>> >>
>> >>-- Steven
>> >>
>> >>
>> >>--
>> >>Delivered by the SEBHC Mailing List
>> >
>> >Joe Smith
>> >joebandit
>> >jtsdadinaz
>> >Conbuilder debugger /Programmer
>>Delivered by the SEBHC Mailing List
>Joe Smith
>Conbuilder debugger /Programmer
>Delivered by the SEBHC Mailing List

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