[sebhc] H-89 bus pin out Help
Dwight Elvey
dwight.elvey at amd.com
Tue Mar 14 12:24:25 CST 2006
Hi
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 ).
Dwight
>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-schematic.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
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