[sebhc] Of ROMS and Things

Walter Moore waltm22 at comcast.net
Fri May 28 17:22:42 CDT 2004

This is what I was reporting after putting my foot in my mouth.  My H-17
never responds to the ROM addresses at 030.000 but since XCON put an image
in RAM at 030.000, it all just works.  Make sure your H-17 ROM logic was
properly disabled per the XCON instructions, or it might still try and drive
the bus for those addresses???


> -----Original Message-----
> From: sebhc at sebhc.org [mailto:sebhc at sebhc.org] On Behalf Of Carroll
> Waddell
> Sent: Friday, May 28, 2004 2:00 PM
> To: sebhc at staunch89er.com
> Subject: [sebhc] Of ROMS and Things
> I just found out something I didn't know. The XCON8 ROM does contain the
> H17 ROM code. If your first memory card is above the ROM area (ie 040
> 000), then XCON8 does nothing with the H17 code. It is still in the ROM
> but not at the correct address, therefore, it won't conflict with the
> actual ROM on the H17 controller. If you have 0 org memory, XCON8 will
> remap the H17 ROM code into the correct address (starting at 030 000).
> It would seem then that the H17 disk system will work without the actual
> H17 ROM chip. I haven't tried it yet, but will as soon as I can get
> another big table in my shop. I've run out of room to spread things out.
> Carroll
> --
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