PCW's 25 worst tech products of all time

Michael B. Brutman mbbrutman-cctalk at brutman.com
Wed Jun 21 20:25:57 CDT 2006

Chuck Guzis wrote:
> IIRC, the Peanut also has no DMA controller and a rather miserly PSU.  In
> comparison to the "clone XTs", it was actually pretty expensive for what it
> offered.  It could be that IBM never fully anticipated the stiff
> competition from the Asian clone builders.

I forgot the lack of DMA, but it is more of a nuisance than a serious 
design flaw.  When using an OS like DOS the lack of DMA just made disk 
access a little slower, as DMA could move memory to and from the floppy 
disk faster than a processor loop could.

A bigger shortcoming that I should have mentioned was having the 
keyboard using the NMI interrupt instead of IRQ1.  I forget the exact 
reason for this, but it resulted in a lot of lost keystrokes an annoying 

The original power supply was 33 watts, which was enough for a 128K 
single floppy system with maybe a sidecar or two.  The power supply was 
later upgraded to 45 watts.  And of course, to power the ridiculous 
sidecars there was a power supply sidecar as well.

IBM never considered other things as competition back then ..  Compared 
to the 64 or other 'home machines', it was very expensive, but also very 
capable.  Compared to the PC, it was inexpensive and 'good enough'. 
Compared to cheap PC or XT clones, it was a hard sell.

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