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Article #23424Re: The compatibility story (Falcon & A1200)
From: Paul Steffen
Date: Wed, 13 Jan 1993 01:27
Date: Wed, 13 Jan 1993 01:27
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2812 bytes
In article <1993Jan12.180221.507@news.uit.no> borgen@stud.cs.uit.no (Boerge Noest) writes: >In article <1itud1INNg96@life.ai.mit.edu> psteffn@hal.gnu.ai.mit.edu (Paul Steffen) writes: >>There is no way to disable the new AA [AGA] functions in the 1200. > >Say what? >You can chose OCS, ECS, (or best) (O=old,E=Enhanced) to make old software >work if it craps on the new registers. Is this done at the hardware level?? Meaning if I select OCS at bootup and set bit 6 of bplcon0, would the Amiga <STILL> kick into SuperHires mode? I don't own an A1200 so I don't know. > >> Software >>that changes the wrong bit in the bitplane control registers can still cause >>problems. It's ironic, though, that Commodore threatens never to release >>another hardware manual, though. They want people to program "cleanly" but >>this be counterproductive. > >I think it is very wise of C=. Then there will not be any way for >programmers to crash when the chips are upgraded. Of course, this depends >on good (and fast) support from the OS. It doesn't matter whether the hardware manual is published or not, people will still get the information by disassembling the libraries. You know this! Isn't it smarter for the information to come from Commodore? Whether Commodore or Abacus publishes the definitive hardware reference manual, it's completely up to Commodore. Personally, I have a better idea of how Commodore should upgrade the Amiga's video hardware next time.. LEAVE IT AS IT IS!! Create a completely new set of custom chip registers and modes independant of the old design. The original chipset architecture is practically topped out with the new AGA modes so why bother? The design of the AGA is roughly akin to Intel 32-bit architecture in that the same basic design was updated. It seems to work for the Falcon, anyway. > >>> | David Oakley, ASTRAsoft shareware producers. |\ >-- >|/// borgen@stud.cs.uit.no (Boerge Noest) | Amiga B2000 \\\| >|// Box 218, 9001 Tromsoe, Norway | Remember to :-) when needed \\| >|/ The worlds northernmost university | Life is worth living. \| >#Disclaimer: This university and me does not agree. Paul Steffen STratoHAK/Tibetan Peach Pie Inc..
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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!ames!olivea!mintaka.lcs.mit.edu!ai-lab!hal.gnu.ai.mit.edu!psteffn From: psteffn@hal.gnu.ai.mit.edu (Paul Steffen) Newsgroups: comp.sys.atari.st Subject: Re: The compatibility story (Falcon & A1200) Message-ID: <1ivr6qINNqjp@life.ai.mit.edu> Date: 13 Jan 93 01:27:54 GMT References: <1993Jan11.120754@cs.bham.ac.uk> <1itud1INNg96@life.ai.mit.edu> <1993Jan12.180221.507@news.uit.no> Organization: /etc/organization Lines: 49 NNTP-Posting-Host: hal.gnu.ai.mit.edu