[sebhc] H-89 bus pin out Help

Robin England robin.england at dial.pipex.com
Tue Mar 14 12:41:59 CST 2006

Hi all

I have been using a schematic that I am sure I obtained from the sebhc
repository, but then again perhaps I didn't. The
schematic consists of three sheets showing video board, main logic board and
terminal board. This is in .pdf
format. It clearly shows the I/O connector pinout on the main logic board. I
have noticed that the component references
for the video board appear to be slightly different from the silkscreen
identification in my H/Z89 machines.

The original file is a .rar format containing the .pdf and has the filename

Is this of any use? If so, contact me directly and I will email it to you (I
didn't think it would be a good idea to just
attach it here, the size is around 1.7MB for the .rar


----- Original Message ----- 
From: "Dwight Elvey" <dwight.elvey at amd.com>
To: <sebhc at sebhc.org>
Sent: Tuesday, March 14, 2006 6:24 PM
Subject: RE: [sebhc] H-89 bus pin out Help

> 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.
> >>
> >>
> >>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

Delivered by the SEBHC Mailing List

More information about the Sebhc mailing list