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- Newsgroups: comp.sys.amiga.hardware
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!menudo.uh.edu!uhphys.phys.uh.edu!stich
- From: stich@uhphys.phys.uh.edu (CHRISTIAN STICH)
- Subject: Re: A1000 ECS ?
- Message-ID: <21JUL199216040569@uhphys.phys.uh.edu>
- News-Software: VAX/VMS VNEWS 1.41
- Sender: usenet@menudo.uh.edu (USENET News System)
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- Organization: University of Houston
- References: <16823B8A2.M23150@mwvm.mitre.org> <al158305.711682867@academ01> <1992Jul21.181107.28894@ninja.zso.dec.com>
- Date: Tue, 21 Jul 1992 22:04:00 GMT
- Lines: 40
-
- In article <1992Jul21.181107.28894@ninja.zso.dec.com>, Hans Ridder <ridder@zso.dec.com> writes...
- >In article <al158305.711682867@academ01> al158305@academ01.mty.itesm.mx (Gustavo Cordova Avila) writes:
- >>M23150@mwvm.mitre.org writes:
- >>>Does anyone know if it is possible to obtain the new Denise chip with
- >>>the new display modes for the A1000. I have WB2.04 and would really
- >>>like to have the extended graphics modes for the workbench.
- >>
- >> You *can* plug in the ECS Denise chip in place of the old (very old :)
- >>Denise, no problem, they're plug in compatible.
- >
- >While they indeed are "plug" compatible, they are *not* "pin"
- >compatible. The ECS Denise requires some additional signals not
- >provided by the A1000 Denise socket. You could probably hack the
- >additional signals, but there's no point. See below.
- >
- >>What I don't know is if you need the ECS Agnus to be able to harness
- >>the new modes, specially the more esoteric ones.
- >
- >Yes, you need an ECS Agnus too, which won't work in the A1000. I don't
- >know for sure, but a Rejuvinator would probably allow both the ECS
-
-
- In Appendix C on page 299 of the Amiga Hardware reference manual (edition) it
- says:
- At present there are four possible settings. A value of 20 or 30
- indicates that the enhanced HighRes Agnus is present.
-
- 8361 (regular NTSC) or 8370 (fat NTSC) = 10 for NTSC
- 8367 (regular PAL) or 8371 (fat PAL) = 00 for PAL
- -> 8368 (hr) or 8372 (fat-hr) = 20 for PAL, 30 for NTSC
-
- Notice that the 8368 follows the 8367 but comes numerically before any of
- the fat Agnus versions.
- This seems to indicate that someone at C= was at least planning a
- Super (non fat) Agnus for the A1000 (or maybe the A2000A ?) which would
- still only address 512 KB of chip mem, but allow the ECS video modes such as
- Productivity and Super-Hires. When I tried to order one through the local
- dealership, they couldn't find an order number in Commodore's parts catalog,
- though.
- Christian
-