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- Path: sparky!uunet!comp.vuw.ac.nz!newshost.wcc.govt.nz!kosmos.wcc.govt.nz!mcmillan_a
- From: mcmillan_a@kosmos.wcc.govt.nz
- Newsgroups: comp.sys.cbm
- Subject: PAL/NTSC screen display
- Date: 17 Nov 92 14:43:03 NZST
- Organization: Welligton City Council, Public Access.
- Lines: 33
- Message-ID: <1992Nov17.144303.1@kosmos.wcc.govt.nz>
- NNTP-Posting-Host: kosmos.wcc.govt.nz
-
- A couple of weeks ago I posted a msg about 'American monitors' and the
- problems I had with the 80 col screen on the 128 being elongated with
- certain programs. In particular Desterm, Kermit and Paperclip III.
-
- Thanks to Jim (cloos@TC.Cornell.EDU) who provided me with detailed
- information on the VDC chip, I was able (with some lucky hacking) to fix
- the problem with Kermit and Desterm, but not Paperclip. (Yet!)
-
- What was happening was, these programs were re-initialling the VDC chip back
- to NTSC conditions, which mucked things up for PAL users. The critical
- registers were numbers 4 (vertical total) and 7 (vertical sync).
-
- Details of the fix are:-
-
- KERMIT
- Load Kermit (120 blocks) in 128 mode,
- Enter monitor, type M 0827B 0827E
- Change the byte at 827B from 20 to 26
- and the byte at 827E from 1D to 20
- eXit monitor, resave KERMIT.
-
- DESTERM
- Enter monitor, type l"desterm2.00",8 (223 blocks)
- Change byte at 8EAE from 20 to 26
- and byte at 8EB1 from 1E to 20
- Scratch "desterm2.00" then
- s"desterm2.00",8,0F00,EC33
-
- I don't know what would happen to NTSC systems (maybe the screen would go
- smaller?), anyway hope it helps some PAL user. I sure made the programs
- much nicer for me to use!
-
- Cheers - Kirk
-