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- Path: sparky!uunet!cbmvax!jesup
- From: jesup@cbmvax.commodore.com (Randell Jesup)
- Newsgroups: comp.sys.amiga.misc
- Subject: Re: Problems with the A4000
- Message-ID: <35069@cbmvax.commodore.com>
- Date: 14 Sep 92 01:31:22 GMT
- References: <1992Sep12.083819.17967@news.iastate.edu> <35058@cbmvax.commodore.com>
- Reply-To: jesup@cbmvax.commodore.com (Randell Jesup)
- Organization: Commodore, West Chester, PA
- Lines: 49
- Keywords: A4000, SCSI, IDE
-
- >In article <1992Sep12.083819.17967@news.iastate.edu> barrett@iastate.edu (Marc N Barrett) writes:
- >> In addition to the costs involved in removing the SCSI subsystem from the
- >>A4000's design, though, we also have to consider the costs involved in
- >>designing the IDE design. These costs would have been practically zero if
- >>the A4000 had simply used the same IDE design as the A600. The problem is
- >>that it does not -- the IDE design used in the A4000 is a whole new design.
- >>The new design was created by Randall Jessup, and includes extra hardware to
- >>make the IDE interface and HD look somewhat like a SCSI interface and HD to
- >>Amiga software. This is a reasonable effort to make the most of a bad
- >>quite a lot to develop, and would not have been necessary had the A3000's
- >
- >Strike three, Marc. The thing Randell Jesup (I''m sure he'd appreciate it
- >if you could spell his name correctly, BTW) did was to write some special
-
- Ken seems to have lost a line here - he probably meant to say that
- I wrote some special _software_ to make IDE look like SCSI.
-
- The main point that Marc missed here is that I did all that work
- (to make a scsi.device that actually is an IDE driver) for the A600. I did
- almost no work for the A4000 version of IDE. The only differences was a
- different interrupt routine (~30 lines), and some minor tweaks to the "is there
- a drive out there" code. Say one day's work total.
-
- >> As Dave Haynie and Randall Jessup have already pointed out, IDE -- even the
- >>new one in the A4000 -- costs next to nothing in terms of manufacturing costs.
- >>But the development costs involved in creating this IDE design must have been
- >>very substantial compared to the costs that would have been involved in
- >>simply carrying over the A3000's existing SCSI design to the A4000.
-
- Totally wrong. Also, the board space in the A4000 is limited, so
- retaining SCSI on the motherboard would have added layout and debugging time.
- Not that it couldn't be done, just things would have been tougher to lay out.
-
- >Marc, the A4000 could cost $1500, have 1280x1024 48-bit graphics, have a
- >32-bit SCSI-2 DMA HD controller, and you'd still bitch about it because
- >nobody could afford the monitor it would require.
-
- I'm sure Marc would find more to bitch about than just the monitor...
- :-(
-
- BTW, I don't read c.s.a.m regularily.
-
- --
- "Rev on the redline, you're on your own; seems like a lifetime, but soon it's
- gone..." Foreigner
- -
- Randell Jesup, Jack-of-quite-a-few-trades, Commodore Engineering.
- {uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.cbm.commodore.com BIX: rjesup
- Disclaimer: Nothing I say is anything other than my personal opinion.
-