🚀 go-pugleaf

In article <C15puJ.1DI@sci.kun.nl> pieterh@sci.kun.nl (Peter Herweijer) writes:
>In <1jj1frINNho0@usenet.INS.CWRU.Edu> ab245@cleveland.Freenet.Edu (Sam Latonia) writes:
>
>>I just upgraded my cpu tonight from the AMD386DXL-40 to the INTEL
>>486DX2-50 cpu. I notice that it takes 40 seconds now from the time
>>that I flip the power switch on, on the computer to the opening
>>screen of my Menu Direct program. (I don't run Windows or OS2)
>>It used to take only 25 seconds with the old 386DXL-40. Can anyone
>>explain why the new 486 cpu after all is set on the mother board
>>for the new cpu takes 15 seconds longer to run the CMOS than it
>>did before the upgrade?????
>
>Hmm... BIOS ROM code takes longer to execute...
>
>>the video test went down from 386=6510 chr/ms
>>to 4028 chr/ms this is in the turbo mode using the LandMark V2.0???
>>It did go up on the normel mode from the 3191 chr/ms (386 cpu) to
>>the same rate of 4028 chr/ms as I have in the turbo mode, why?
>
>video code slows down, (practically) independent of CPU speed...
>
>You apparently have a memory interface problem. Tell me: have
>you accidentally disabled ROM shadowing?  Weird wait state
>settings? Are _both_ caches enabled (probably for the 386 the
>'internal cache' entry was set 'disabled')?
>
>Peter Herweijer
>pieterh@sci.kun.nl

The slowdowns are probably due to a change in the system clock (40MHz
for the 386 to 25MHz for the 486DX2).  The boot-up (a lot of disk
accesses) and video speed are dependent on the ISA bus speed.  I'd bet
his bus speed is set at 1/5 ACLK (8MHz for a 40MHz system clock, but
5MHz now for 25MHz system clock).  Changing it to 1/3 ACLK should fix
it.