Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!agate!shelby!msi.umn.edu!noc.MR.NET!gacvx2.gac.edu!hhdist
From: TNAN0@CCVAX.IASTATE.EDU
Newsgroups: comp.sys.handhelds
Subject: HP48SX Screen Addresses
Message-ID: <0481BF77937F618367@ISUVAX.BITNET>
Date: 15 Nov 90 03:15:00 GMT
Lines: 40
To: handhelds@gac.edu
Return-path: TNAN0@CCVAX.IASTATE.EDU
To: handhelds@gac.edu
X-Envelope-to: hhdist
X-VMS-To: IN%"handhelds@gac.edu"

Hello All,

   I asked this question once before (quite awhile back) and received no
reply, so I feel it's time to ask again.

   I am enjoying programming my HP48SX in machine language, but I am
running into problems accessing display memory.  I need to know how
video memory is laid out and where the elusive pointers are that keep
track of its current location.  I know that the most current version of
CHIP (v 2.25 I believe) keeps tabs on it very well, but I have not seen
the source for 2.25 available anywhere.

   Also, where is the most complete set of internal addresses available from?
I have merged my SAD and TA comments into one huge listing, but still I see
quite a few addresses posted here at comp.sys.handhelds that I have not come
across in my own travels...

   And the last...  Has anyone got SAD to run on a PC clone yet?  It seems
that SAD expects its compiler to use at least 4-byte integers, and most
PC compilers use only 2-byte integers...  I ran through and changed all
"int"s to "long int"s except for ARGC...  It compiles fine, but when I
disassemble it only prints the first couple of columns...  (Thus I can
only see the disassembly if I have SUPPRESS COMMENTS on...)  I can
handle this one myself, but it also freaks out when it tries to disassemble
anything with a "D" in the ML...  I just can't figure out why...  I'll
have to get my hands pretty dirty to figure out what it needs, so I'm
looking for a cheap way out... Any suggestions?

So, a summary:

1) Where is video memory and how is it structured?
2) Where is a good list of internal addresses?
3) Is there a pre-compiled version of SAD available for the PC?

Thanks for all of your support:

---Xeno
(Gary Snethen)
tnan0@isuvax (Bitnet)
tnan0@ccvax.iastate.edu (Internet)