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- Newsgroups: comp.sys.ti
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!ukma!netnews.louisville.edu!ulkyvx.louisville.edu!jhwhit01
- From: jhwhit01@ulkyvx.louisville.edu
- Subject: WHT Products and Asgard AMS/AEMS
- Sender: news@netnews.louisville.edu (Netnews)
- Message-ID: <1992Nov23.212013.1@ulkyvx.louisville.edu>
- Date: Tue, 24 Nov 1992 01:20:13 GMT
- Lines: 63
- References: <V9BouB2w165w@ersys.edmonton.ab.ca>,<1992Nov23.024357.1@ulkyvx.louisville.edu> <009640CD.96392840@GOMEZ.PHYS.VIRGINIA.EDU>
- Nntp-Posting-Host: ulkyvx02.louisville.edu
- Organization: University of Louisville
-
- In article <009640CD.96392840@GOMEZ.PHYS.VIRGINIA.EDU>, cohen@GOMEZ.phys.virginia.edu writes:
- > Why is there no MFM host adapter? One can buy 8-bit MFM hard (& floppy)
- > controllers for the IBM PC for next to nothing now, and it would be great
- > if we could use those instead of a flaky Myarc HFDC. And, as far as I understand,
- > it is much easier to implelement than the SCSI.
-
- An MFM controller for the TI would cost nearly as much as the SCSI host adaptor
- does. The MYARC HFDC is an MFM controller. There are two very good reasons
- why cards for the TI cost more than those for the PC: (1) supporting a market
- that continues to shrink necessitates recouping development costs quickly and
- with few sales of product; (2) there are few competing products to drive the
- prices down -- an effect of reason (1). MFM, IDE, and SCSI drives cost about
- the same per megabyte NEW. SCSI hard drives come in much higher capacities
- than the others. Unlike MFM and IDE cards, the SCSI host adaptor will be
- able to use CD ROM technology. Right now, MFM hard drives are getting harder
- to find NEW, and I've heard that most, if not all, manufacturers are getting
- out of the MFM drive business. IDE and SCSI are the two emerging technologies,
- and SCSI is a living standard that has evolved into SCSI-2 with SCSI-3 on the
- way. The WHT SCSI card follows "SCSI-1" specifications, and several used and
- reconditioned SCSI hard drives are on the market at prices rivaling those of
- used and reconditioned MFM hard drives.
- >
- > Would somebody tell us the difference (from the end-user point of view) between
- > the 4A Memex and the Asgard AMS/AEMS? Would it be possible to design
- > software that would run concurrently on both? Otherwise it's going to be
- > a mess... I suppose we all understand that the last thing we need now is a
- > further division of the shrinking user base into further segments that
- > cannot exchange data and files with each other, so it would be best if Asgard,
- > WHT and OPA could coordinate their efforts in such a direction. What is the
- > current situation?
-
- Describing the differences between the 4A Memex and AMS/AEMS cards would take
- quite a lot of room. The 4A Memex will support up to 16 Meg per card when it
- is released. The AMS/AEMS supports 128K or 512K right now. The 4A Memex will
- have a DSR on it that does memory-management, RAMdisk, and other functions.
- It can also powerup in RAMBO mode, and is thus compatible with OPA's RAMBO
- modification to the Horizon RAMdisk which is included on the Horizon 4000
- boards. The AMS/AEMS is not compatible with any other memory card out there,
- and can only coexist in the same P-box with the Horizon or 4A Memex. The 4A
- Memex can coexist in the P-box with any other memory card available, though
- full functionality will be available only when it is used by itself or with
- Horizon/RAMBO cards. The AMS/AEMS does not have a DSR, which means that the
- memory-management functions will have to be done by the application software.
- >
- > Last but not least, I am amazed (and glad) that all this effort is still going
- > on. I would have kept my TI-99/4A anyway, and it is really nice that you,
- > and others like you, are willing to put time and effort to further develop it.
- > Same goes to the Asgard team.
- >
-
- I am glad you appreciate the efforts. One thing which keeps development going
- at such a slow pace is the risk of a product failing to sale sufficiently to
- continue development. Earlier hardware manufacturers made substandard products
- for a relatively much larger market. Note that not all products made were
- bad, and I don't mean to imply that they were. It is just that now that
- many TI users are salivating over the new gadgets available for other computer
- users, the expectations have risen.
-
- If there were some Telnet site where comp.sys.ti users could gather for a
- conference, I could probably get Don O'Neil (WHT) to visit to discuss the
- products.
-
- Jeff White jhwhit01@ulkyvx.louisville.edu
-