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- Newsgroups: comp.misc
- Path: sparky!uunet!cs.utexas.edu!mercury.unt.edu!ponder!drice
- From: drice@ponder.csci.unt.edu (Keith Rice)
- Subject: Re: Taken delivery of an old PC... now what?
- Message-ID: <drice.715486528@ponder>
- Sender: usenet@mercury.unt.edu (UNT USENet Adminstrator)
- Organization: University of North Texas
- References: <25393@castle.ed.ac.uk>
- Date: Thu, 3 Sep 1992 02:15:28 GMT
- Lines: 80
-
- In <25393@castle.ed.ac.uk> 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
- >about not having a system disc.
-
- Genuine IBM systems come up in "cassette" BASIC when a boot disk is not
- inserted into the floppy drive and no bootable hard disk is present.
-
- > 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
- >into the sockets, and what type?)
-
- The blank socket is for an 8087 math coprocessor. The three rows of empty
- sockets are for memory expansion (just add the same type of chips that are
- in Bank 0 and set the DIP switches on the motherboard to whatever amount
- of memory you have (I don't have the info for that...sorry)).
- > 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?)
-
- Can't help you with that one.
-
- >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
- >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
- >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".
- >The third card is a disc controller.
-
- The 25-pin socket on the video board is a parallel port. The 9-pin
- socket on the Addram board is serial and the 25-pin is another parallel
- port, I think. (You probably won't need to add memory to the motherboard
- if you have the Addram. You may need device driver software though.)
- The battery is probably for a clock/calendar.
-
- >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.
-
- The disk drives take 360K DSDD diskettes.
-
- >The questions I have in specific are - are early versions of DOS (that
- >would fit on one 5.25 disc) available PD?
-
- Nope. All versions of DOS are copyrighted by Microsoft but I'm sure
- someone has a (legitimate) copy that they may just give you with the
- manuals. If you were here in the US in Texas I would give you one of
- my old version but, alas, you are not.
-
- > Can I replace the processor
- >with something a little more speedy?
-
- You can replace the 8088 with a V20 from NEC. It's slightly faster.
-
- > Or is there a coprocessor around
- >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?
-
- (Coprocessor info and Addram info above.) BASIC can only access a max
- of 64K for its programs even if you have 640K of memory in your system.
-
- >And why the heck am I bothering to do this?
- >(I can answer the last one - because I'm mad)
- >Thanks in advance...
-
- --
- D. Keith Rice -- University of North Texas -- drice@ponder.csci.unt.edu
- -----------------------------------------------------------------------
- Beta Test: To voluntarily entrust one's data, livelihood and sanity to
- hardware or software intended to destroy all three. In
- earlier days, virgins were selected to beta test volcanoes.
-