386 Xenix on a 486 ???

[Warren Tucker]

In article <442 at alchemy.UUCP> victor at alchemy.UUCP (Victor Michael) writes:
>[] In article <1991Jun3.061736.28833 at marlin.jcu.edu.au> cpmwc at marlin.jcu.edu.au (Matthew W Crowd) writes:
>
>[] >Will 386 SCO Xenix run on a 486 Clone ?
>  Our firm has contacted SCO regarding this. THEY say the 386 runs
>  on a 486.  HONEST! (but PLEASE call SCO sales)  

I am very happily running SCO ODT 1.1 (and did run 1.0) on a 486/33
with an AT bus.  It is very very fast.  We simply took the disk
out of the old box, put it in the new one and booted.

This seems only logical since a 486 follows the programming model
of the 386 EXACTly.  What you have to look out for is the
peripherals.  Granted, I hate putting up with the slow bus, but
for $3500, I moved from a 386/20 with 7MB to a 486/33 tower with
16MB and 128k cache.  (And I still have the 386/20 carcass on the
shelf).  I gave 2MB of the new ram to disk cache and -voila-
compiles and links run 4 to 5 times as fast.  Now if I had had
about $1500 more for EISA and new disk controllers, I don't think
I could keep it busy!

My last /usr/adm/messages shows it thinks it is running on a 386
with 387 (which is logically correct except for a small matter of
packaging and speed :-)):


D10 bits of I/O address decoding
Edevice   address	vector	dma	comment
-----------------------------------------------
Tue Jun 4 22:08:27
-----------------------------
%fpu      -		15	-	type=80387
F0F1F2F3%fas      0x03F8-0x03FF	04	-	unit=0 type=* FAS/i 2.08.01
%fas      0x0210-0x0217	03	-	unit=1 type=F FAS/i 2.08.01
%fas      0x0218-0x021F	03	-	unit=2 type=F FAS/i 2.08.01
%fas      0x0220-0x0227	03	-	unit=3 type=* FAS/i 2.08.01
%fas      0x0228-0x022F	03	-	unit=4 type=* FAS/i 2.08.01
%fas      0x0230-0x0237	03	-	unit=5 type=* FAS/i 2.08.01
%fas      0x0238-0x023F	03	-	unit=6 type=* FAS/i 2.08.01
%fas      0x0240-0x0247	03	-	unit=7 type=* FAS/i 2.08.01
%fas      0x0248-0x024F	03	-	unit=8 type=* FAS/i 2.08.01
F4%floppy   0x03F2-0x03F7	06	2	unit=0 type=96ds15
F5F6%console  -		-	-	unit=vga type=0 12 screens=128k
F7%parallel 0x0378-0x037A	07	-	unit=0
F8F9F10F11%tape     0x0300-0x0304	05	3	type=A
F12F13F14GH0H1H2H3H4H5H6%disk     0x01F0-0x01F7	16	-	type=W0 unit=0 cyls=1222 hds=15 secs=34
H7H8H9H10H11H12I0mem: total = 16000k, kernel = 4448k, user = 11552k
JKLrootdev = 1/40, swapdev = 1/41, pipedev = 1/40
nswap = 20000, swplo = 0, Hz = 60
kernel: i/o bufs = 2000k
Tue Jun 4 22:08:31
%disk     -		-	-	type=W0 unit=1 cyls=1241 hds=15 secs=34
 
-----------------------------------------------------------------------
Warren Tucker, TuckerWare   gatech!n4hgf!wht or wht at n4hgf.Mt-Park.GA.US
Many [Nobel physics] prizes  have been given  to people for  telling us
the universe is not as simple as we thought it was. -Stephen Hawking in
A Brief History of Time     In computing, there are no such prizes. -me