On 12/08/2016 6:10 AM, Christian Euler wrote: > Hi, > > Am 11.08.2016 um 22:09 schrieb firstname.lastname@example.org: >>> Alerts are displayed on a default PAL (or NTSC) 2-colour hires >>> screen mode. >> >> That's what I mean - what is the "default" (not set by Workbench). If >> there is no code for setting the mode to either PAL or NTSC and both >> ROM and hardware were shared between PAL and NTSC countries then how >> did it decide which mode to use for the Guru? > PAL and NTSC machines use different Agnus chips: > > 252125-01 IC 8361 AGNUS NTSC AMIGA-1000 > 252362-01 IC 8367 AGNUS PAL AMIGA-1000 > 318069-02 IC 8372 FATAGNUS AMIGA-2000 > 318069-03 IC 8375 HIRES AGNUS 2M A-3000 > 318069-10 IC 8375 R2 AGNUS HR PAL SMT A-500+/A-600 > 318069-11 IC 8375 R2 AGNUS HR NTSC SMT > 318069-16 IC 8375 R01M HR AGNUS PAL 65NS AMIGA-2000 > 318069-17 IC 8375 R01M HR AGNUS NTSC 65NS AMIGA-2000 > 318069-18 IC SM CSG 8375R0 SUP AGNUS > 318070-01 IC 8370 R3 FAT AGNUS NTSC AMIGA-500 > 318071-01 IC 8371 R1 FAT AGNUS PAL AMIGA-500 > 390544-01 IC 8375 FAT AGNUS AMIGA-500+ > 390544-02 IC 8375 AGNUS 2 MEG NTSC A500+ > > Older Agnus chips are either fixed to PAL or NTSC, never chips can be > preconfigured by grounding a pin and/or switched via software. > As an aside, the very earliest (non-Commodore branded on the fascia) PAL Amigas sold in Australia were NTSC machines converted to PAL by Commodore. You can see the additional board added by Commodore here standing vertical with the crystal on it. http://users.on.net/~clockmeister/other/Amiga-1000/A1000%20internals3.JPG I'm not sure what the actual chip numbers are anymore, I would have to pull the A1000 out of storage and open it up. If there is interest, I will. Message was sent through the cbm-hackers mailing listReceived on 2016-08-12 01:00:04
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