| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 3889.1 | | FILTON::FENTON_R | Potassium Ethoxide Rules C2H5OOK | Mon Jul 02 1990 07:22 | 5 |
| So would this deal with what appears to be the A1500's only
shortcoming, ie can't attach a PC bridgeboard?
-Rog Who Couldn't Afford It Anyway
|
| 3889.2 | It's still not an AT | GOBAMA::WILSONTL | Tony, the HOSS TRUMPET | Mon Jul 02 1990 19:36 | 4 |
| Remember...it's only a PC/XT.
--
Tony
|
| 3889.3 | | FILTON::FENTON_R | Potassium Ethoxide Rules C2H5OOK | Thu Jul 05 1990 07:08 | 4 |
| Oh. 'Fraid I don't understand the difference to any great extent.
-Rog
|
| 3889.4 | "BEYOND THE SCOPE OF THIS CONFERENCE ;^)" | GOBAMA::WILSONTL | Tony, the HOSS TRUMPET | Thu Jul 05 1990 23:08 | 6 |
| I don't either. I just hear from PC people that the AT is better than
the XT and I thought the PC Bridgeboard emulated the AT. Personally, I
have a PS/2 Model 50 on my desk (courtesy of Bell South) and I use it
for terminal emulation and to keep the desk from floating away.
|
| 3889.5 | Speed differance based on Processors... | SHARE::DOYLE | | Mon Jul 09 1990 09:31 | 10 |
| The main difference between the 2 as far as I know is speed.
I believe the AT runs at 12-16 MHZ depending on wether a math
coprocessor is present.
An XT will run 7-12 MHZ.
Don't quote me on these speeds though.... ;')
Ed
P.S. I believe the card runs at a little better than 8 MHZ.
P.S.S. I'd like to get one, but I wanna see a indepth review first!
|
| 3889.6 | | VMSNET::WOODBURY | | Thu Sep 06 1990 02:56 | 3 |
| I am NOT what you would call an expert on IBM PCs, but I believe the
AT is a 80286 based machine. That means that it can address 16 MBytes of
memory. The XT class machines can only address 1 MByte.
|
| 3889.7 | | BAGELS::BRANNON | Dave Brannon | Fri Sep 07 1990 13:42 | 19 |
| I read somewhere that the reason the tiny PC boards are XTs is because
the 80286 doesn't come in a CMOS version. Something about CMOS needing
very little power.
That may have changed, given the move away from XTs in the ibmpc
market. Maybe there are CMOS 80286 chips now.
re: .6
you are correct, an AT is a 80286 based machine. But it needs to be
put into protected mode to access the 16MBytes, MS-DOS run in real
mode. So from the MS-DOS user's point of view, the AT is just a faster
XT. Not much used protected mode until recently because on the 80286
you could go into protected mode, but could not switch back to real mode.
The 80386 fixes that problem.
nac::ibmpc is a good source for info on that stuff.
Dave
|