MSDOS Source code leaked

Chuck Guzis cclist at
Fri Oct 13 17:19:31 CDT 2006

On 10/13/2006 at 10:36 PM ard at wrote:

>IIRC, tweaking this trimmer is documetned in the Hardware Maintenance and 
>Service manuals, as a way to correct missing colour on a composite

Probably.  I think the 14.3/4.77 MHz clock and cassette tape interface go a
long way toward explaining the original intent of the 5150--basically a
home entertainment box driving a TV set,  much like the Atari 400/800
boxes.  And it also explains that when I tried to order a 5150 for export
(50Hz 220v), the IBM sales office told me that it "would be a while yet".

Given price point of the PC, it would have been a very difficult sell
against the Atari and CBM machines had IBM not changed its marketing focus
a bit.

Given the (somewhat needless) complexity of the MDA. I get the feeling that
it was an afterthought type of product to turn the PC into a desktop

So IBM just "stumbled" into the desktop market, it seems.  If they were
truly aiming for it from the start, their box might have been an 8 MHz


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