home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.amiga.misc
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!wupost!think.com!linus!linus.mitre.org!linus!mbunix!eachus
- From: eachus@Dr_No.mitre.org (Robert I. Eachus)
- Subject: Not an orphan (was Re: If the AA is designed for the A3000...)
- In-Reply-To: Michael.Witbrock@cs.cmu.edu's message of 15 Sep 92 02:38:48 GMT
- Message-ID: <EACHUS.92Sep15115343@Dr_No.mitre.org>
- Sender: news@linus.mitre.org (News Service)
- Nntp-Posting-Host: dr_no.mitre.org
- Organization: The Mitre Corp., Bedford, MA.
- References: <1992Sep12.083819.17967@news.iastate.edu>, <35103@cbmvax.commodore.com>
- <cehImsC00j_HR32IgO@cs.cmu.edu>
- Date: Tue, 15 Sep 1992 16:53:43 GMT
- Lines: 109
-
-
- In article <cehImsC00j_HR32IgO@cs.cmu.edu> Michael.Witbrock@cs.cmu.edu writes:
-
- > Excerpts from netnews.comp.sys.amiga.misc: 14-Sep-92 Re: Problems with
- > the A4000 Dave Haynie@cbmvax.commo (6491)
-
- > Correct. In point of fact, the AA chipset was designed for the A3000,
- > as I
- > explained above.
-
- In that case, although we know C-A has no intention of doing it, it
- would be interesting if you, or one of the other CA engineers, felt
- disposed to muse about the possibility of a third party developer making
- a kludge to get the AA set into a 3000.
-
- I don't work for Commodore, and I am not under any non-disclosure,
- so I think I can answer. Let's say someone walked into Dave's office
- six months ago and said:
-
- "Now that we have the AGA chipset, why don't you see about
- designing that upgrade for the 3000..."
-
- Okay, several possibilities to check:
-
- 1) Replace existing custom chips, probably with a daughter board
- with the new chips directly mounted. Hmmm, to make it work we need
- 32-bit wide memory replacing the chips on the motherboard, access to
- all these signals,...
-
- Three possible answers:
-
- a) There is a signal we didn't know we would need, that is
- simply not accessable. (Unlikely.)
- b) There is simply not enough clearence to put the new board in.
- (Likely.)
- c) It would cost too much. (Unlikely.)
- d) Timing and lead capacitance make it a nightmare if it works
- at all. (Very likely--it might be doable as a hack, but
- totally beyond the pale as a field upgrade. You might have
- to select parts and do other tweaking.)
-
- 2) Put a new board in the CPU slot.
-
- a) There are needed signals not available. (Very likely.)
- b) Conflict with new CPU boards...do we put a 68040 on it?
- c) Timing and noise problems, see above.
-
- 3) Put a board in the video slot.
-
- a) Need DIG, since the custom chips still have to support the
- other peripherals. (Certain.)
- b) Need to redesign the chips slightly to operate in the new
- environment. (Possible.)
-
- 4) Replace the motherboard.
-
- a) Not a kludge, in fact a very nice new machine, but the cost
- will be VERY high: (new 68030, new 68882, etc., etc.)
-
- So the engineers come back and say that the motherboard upgrade is
- the clean solution, and a video board may be possible down the road.
- But marketing says:
-
- 1) The cost of the motherboard upgrade is just too high, if we do
- it, we should release it as a new machine in the 3000 case, and anyone
- who wants to upgrade their motherboard can buy one through mainentance
- channels. (In the A3000T/040 case, it looks much more attractive.
- Commodore may have factored the motherboard upgrade into the current
- price.)
-
- 2) We are doing DIG, but once that is available the third party
- boards will probably have the upgrade market cornered, so there is no
- reason to do the chip and board development. If we want to sell to
- some of these potential customers, price the A4000 agressively.
-
- Now assuming all this is true, what does it mean for Amiga 3000
- owners? They have three choices:
-
- Buy a 4000. Commodore is agressively pushing this on price, and
- may do more. If I bought a 3000 intending to get a 68040 board and a
- graphics upgrade, $3000 is not bad, and I still have a 3000 to use or
- sell... (Not my problem but possibly my solution, I have a 2500/30 at
- work.)
-
- Buy a third party graphics board, and hope that the board vendor or
- Commodore will provide DIG soon. (Not a bad bet with some of the
- graphics vendors. I suspect that AmigaDOS 2.1 is a lot closer to DIG,
- and that at worst vendors will need to wait for 3.1 to be able to
- provide complete support.
-
- Live with what they have and see what develops. Not a bad call,
- since most users don't push the current graphics to the limit. The
- 3000 is a nice machine and if you are not doing heavy graphics, wait
- six months and see what develops.
-
- One last point, everything about the A4000 box screams mid-range.
- I'm sure that Commodore considers the A3000T case the high-end box. I
- am certain we will see an AGA solution for those users soon, and
- Commodore has stated that the A3000T/040 will soon have a new
- motherboard...
-
-
- --
-
- Robert I. Eachus
-
- with STANDARD_DISCLAIMER;
- use STANDARD_DISCLAIMER;
- function MESSAGE (TEXT: in CLEVER_IDEAS) return BETTER_IDEAS is...
-