Date   : Wed, 25 Mar 1992 22:13:13 PST
From   : pallio.UUCP!dg@mis.ucsf.EDU (David Goodenough)
Subject: Televideo 803H information wanted

larry@lfergus.UUCP (Larry Moore) asks:
> What's the address of  the boot rom on a TeleVideo 803H?

Contrary to what at least one persone believes, the boot rom on the
Televide is at zero. It's accesses by writing some code in the top
16K of memory that outputs zero to port 13h, this pages out the TPA
and pages in the boot rom. Output a 1 to port 13h to page the TPA
back in.

As for where you'd put this code, I've got a couple of suggestions:
On a standard 803 (dunno if this'd work on an 803h), BDOS starts
at (I think) CA00H - this means the space from C000 to C9FF is
available. The other place that is handy for hiding things away
is the GSX buffer: this is 128 bytes long, lives in the BIOS
(EA00H or higher) and is pointed to by the word at FF00H. Take a
look at the standard 803 QTERM code in QTERM.Z to see how to
shove something into that space.

(David Goodenough or some other TeleVideo guru?) 

Dammit - I swore I wasn't going to be famous. It's not worth the
bother :-)
-- 
       dg@pallio.UUCP - David Goodenough               +---+
                                               IHS     | +-+-+
       .....!wet!pallio!dg                             +-+-+ |
AKA:   dg%pallio.UUCP@cs.sfsu.edu                        +---+


End of INFO-CPM Digest V92 Issue #20
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