Why is CP/M faster than DOS

From: Richard Erlacher <edick_at_idcomm.com>
Date: Thu Sep 2 09:58:35 1999

On my Ampro Little Board (the original one) on which I have a small hard
disk, though this is by no means limited to the hard disk, software loads
VERY fast as well. It's no coincidence, I believe, that this one has the
Kaypro format as an optional diskette format. The difference, I belive is
the way data is stored on the diskette. If you have the right combination
of sector skew and data block size, tansfers to/from diskette are quite
fast. What's more, since CP/M systems didn't normally attempt to do all the
crazy stuff that DOS attempts to do with its BIST/POST firmware, there's
less to wait for. I think one will be disappointed with the real
performance of the typical 4 MHz Z-80 if it's evaluated in an
I/O-independent way, since we've become accustomed to much faster

Nonetheless, turning the machine on and having the prompt waiting for you by
the time the monitor is warmed up enough to show the image is quite a treat.
With one of those 1.25" tall 3-1/2" drives, my Ampro boots up CP/M in a
second or two. It's amazing!

-----Original Message-----
From: Phil Clayton <musicman38_at_mindspring.com>
To: Discussion re-collecting of classic computers
Date: Thursday, September 02, 1999 7:44 AM
Subject: Why is CP/M faster than DOS

>After reading all the comments on CP/M computers a comment was made that
>is a faster OS that DOS.. I have found this to be very true.
>My Kaypro 1X boots up in 5 seconds, and loads MBASIC in about another 5
>seconds, also
>executes the same BASIC code faster than on my XT.
>Now on my old Compaq XT, it takes about 30 seconds just for the hardware to
>then another 20 seconds to boot to a DOS prompt, then another 15 seconds to
>boot BASIC.
>So can some of the experts here tell me why CP/M is so much faster ?
Received on Thu Sep 02 1999 - 09:58:35 BST

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