🚀 go-pugleaf

In article <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?????

That's easy.  Because the internal bus was running at 40Mhz before, whereas
with the 486DX2-50 the internal bus is running at 25Mhz.  There's an
interesting-but-complex correlation between the clock factor and the ISA bus IO 
speed.  

>
>(2) I also notice that while I do see a vast improvement in cpu
>speed (386=62.40mhz) To (486=167mhz) it seems that the char in
>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?
>Can you tell my???

Again, this is because of the bus speed.  The amount of delay on the ISA video
bus is often tied to the internal clock of the CPU bus.  That's why a true
50Mhz 486DX-50 is much, much faster in terms of video and other IO.  Because
the CPU bus is running at a full 50Mhz vs the DX2-50's 25Mhz.  That's also why
your CPU upgrade slowed down the video; because you downgraded your clock from
40mhz to 25mhz.

It does appear from the character benchmarks that the "turbo mode" switch on
the 486DX2 configuration is not functioning as you report the same benchmark
(4028 chr/ms) for both.

Alex