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- Newsgroups: comp.misc
- Path: sparky!uunet!ftpbox!motsrd!mothost!white!rtsg.mot.com!lido16!wiegand
- From: wiegand@rtsg.mot.com (Robert Wiegand)
- Subject: Re: Taken delivery of an old PC... now what?
- Message-ID: <wiegand.715378282@lido16>
- Sender: news@rtsg.mot.com
- Nntp-Posting-Host: lido16
- Reply-To: motcid!wiegand@uunet.uu.net
- Organization: Motorola Inc., Cellular Infrastructure Group
- References: <25393@castle.ed.ac.uk>
- Distribution: comp
- Date: Tue, 1 Sep 1992 20:11:22 GMT
- Lines: 88
-
- asr@castle.ed.ac.uk (Angus "Fluffy" Rae) writes:
-
- >Yesterday a friend, knowing that I collect computers from the early
- >80's, dumped an old IBM PC on me. However, knowing nothing of PCs I
- >don't know exactly what I've. After a quick shufty around under the case
- >here's the info I have, and I wonder if someone out there can fill in
- >the blanks. The badge on the back says IBM 5150, and it boots up into
- >IBM Basic version C.01, which surprised me - I expected it to complain
-
- Real IBM machines have Basic in ROM. If no disk is found they default
- to ROM Basic.
-
- >about not having a system disc. The processor is an 8088, with a blank
- >socket next to it (coprocessor)? On the board are 4 rows of Ics marked
- >Bank 0 to Bank 3, which I take it is memory. Bank 0 is soldered, the
- >other banks are empty sockets. (Question here is - can I fit more memory
-
- You should be able to add more memory of the same type. You would need to
- change some DIP switches for the memory to be used.
-
- >into the sockets, and what type?) Above this are two empty IC positions
- >with solder dots, marked U100 and U101. There is also an empty socket
- >marked U34. (Anyone know what should/can fit in them?)
-
- >There are three boards in the slots - one is marked
- >"Black&White/Parallel" and has a 9pin socket for the monitor and an
- >unknown 25 pin socket, which I assume is a parallel printer port. The
-
- Sounds correct.
-
- >next card is marked "Addram Plus" and also has a 9pin and a 25pin
- >socket. I assume that these are serial ports of some kind, but the card
-
- Probibly serial (9 pin) and parallel (25 pin).
-
- >also seems to be a memory expansion of some kind. It has a large number
- >of what seem to be RAM chips and a NiCad battery marked "DataSecurity".
-
- From the card name it should be a RAM card. I'm not sure what the
- battery is for, unless the card also has a clock.
-
- >The third card is a disc controller.
-
- >The discs are 5.25 inch but I'm not sure how much they can hold, or
- >whether they can access double sided or not.
-
- I would guess double sided single density (360K), but they could be
- single sided. You should be able to tell by visual inspection of
- the heads.
-
- >The questions I have in specific are - are early versions of DOS (that
- >would fit on one 5.25 disc) available PD? Can I replace the processor
-
- No PD versions of DOS that I know of, but you should be able to
- pick up a used one pretty cheap from someone who upgraded.
-
- >with something a little more speedy? Or is there a coprocessor around
-
- I think NEC made compatible processors that were a little faster.
- For any real speed increase you would need a new motherboard.
-
- >that will fit in that blank socket? Does the AddRam board need some sort
- >of boot software, as the Basic startup said I had 62k which seems a
- >little low...? And why the heck am I bothering to do this?
-
- If only 62K show up than I don't think its seeing the RAM board. I'm not
- sure what you need to make it work.
-
- >(I can answer the last one - because I'm mad)
- >Thanks in advance...
-
- >--
- >Angus G Rae, the Cuddly Vampire Teddy Bear [asr@castle.edinburgh.ac.uk]
- >CATHY VoiceMail, Computer Science Dept., Edinburgh University
- >"I'm on the run from the Facist Police with a murderer and
- > a mass murderer and a man in a bri-nylon shirt." Rimmer, Red Dwarf V
-
- Generally - It sounds like you have a nifty antique which is almost
- useless as a real computer. Fixing it up to something more powerfull
- would cost about the same as just buying a new computer. So have fun
- playing with it, but don't expect much.
-
-
- --
- ------------------------------------------------------------------------------
- Robert Wiegand - Motorola Inc.
- uunet!motcid!wiegand
- Disclamer: I didn't do it - I was somewhere else at the time.
-