DOS code in CP/M? Revisited...

jim stephens jwsmail at
Fri Jul 15 18:54:46 CDT 2016

On 7/15/2016 12:15 PM, Chuck Guzis wrote:
> On 07/15/2016 11:52 AM, Guy Sotomayor Jr wrote:
>> P.S. A full build for the board I work on (OS and creating the boot
>> image) for work takes < 1 hour.  The firmware I’m working on takes
>> just 2-3 seconds to build!  This is on a PC with a 3.2GHz Skylake i7
>> with SSDs.  ;-)
> The problem is that while the PCs are getting faster, I'm slowing down.
> One vivid memory I have of the S/360 F-level assembler is that while the
> macro language was very rich, macros could take a very long time to
> evaluate.  Some of the "system" macros were real doozies.
Hasp and I think Control program (??) on MVT were about a foot high.

The system programmers for our shop at University of Missouri, Rolla, 
360/50, MVT 19 thru 21 era had a hot plate, skillet, and they snacked on 
spam while waiting and working.  Made for a unique aroma to the computer 

> Of course, none of that compares to the card-only systems without mass
> storage.
> --Chuck

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