PC question

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Mon Apr 26 11:40:16 1999

> additional reset switch, keylock switch, and "power on" LED on the front
             ^^^^^^^^^^^^
NO!!!!!
Any responsible computer manufacturer of the time included a reset switch.
But we are talking about IBM.
THERE WAS NO RESET SWITCH ON A REAL UNMODIFIED IBM AT.


Minor quibble: was the XT power supply 135W?




On Sun, 25 Apr 1999, Marvin wrote:
> Megan wrote:
> >
> > Yesterday, at the KS10 move, I came away with two IBM PCs, but I
> > don't know enough about them to know if they are the AT or XT
> > models... they both have a 5.25" floppy and a hard drive, and
> > both have color monitors.
>
> IBM PC - 5 slots, 8 bit card connectors, 63.5 watt P/S, 0 - 2 360K floppy
> disk drives, 4116 or 4164 memory chips depending on motherboard, and a
> maximum of 256K RAM on the motherboard. The keyboard does not include
> separate cursor keys. The front nameplace will have IBM Personal Computer on
> it.
>
> IBM XT - 8 slots, 8 bit card connectors (one connector per slot), 150 watt
> P/S, 1 or 2 360K floppy disk drives, Hard disk, can't recall memory chips
> but I believe 4164 up to 256K RAM on motherboard, same keyboard as the PC.
> The front nameplate will have IBM Personal Computer XT on it.
>
> IBM AT - 8 slots, 16 bit card connectors (two connectors per slot), IIRC 200
> watt P/S, 1 or 2 floppy drives: if one, then 1.2 MB Floppy disk, if two,
> could be one 1.2 MB floppy and one 360K, or two 1.2 MB drives, up to 512K
> RAM of 41256 chips on motherboard (early ones used piggy back chips), AT
> keyboard with separate cursor keys. Can't recall what the front nameplate
> has on it, but the case (besides being bigger than the XT case) has an
> additional reset switch, keylock switch, and "power on" LED on the front
> panel.
>
> Modifications can change the above configurations, and one of the common
> mods was to put a hard drive in a PC by replacing the P/S with a 150 watt
> P/S and adding the HD controller. Clone PC/XT cases could also have the same
> front panel switches as the IBM AT. Lots more possibilities but I think this
> takes care of the most common cases (pun intended :) .)
Received on Mon Apr 26 1999 - 11:40:16 BST

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