morphed to TTL part number history, was: IBM PLAYING

[Tony Duell]

> 
> On 12/20/2005 at 12:10 AM ard at p850ug1.demon.co.uk wrote:
> 
> >I recently bought a second-hand Philips 'upright' reel-to-reel tape 
> >recorder, and found a schematic glued to the inside of the case. At one 
> >time this was quite common on consumer electronic devices I believe.
> 
> Not at all uncommon on radios and TVs using vacuum tubes (valves).  Very

Actuallym this tape recorder uses (germanium) transistors. I'm still 
looking for the mains-powered valved version (EL3514). But yes, certainly 
a lot of valve radios, etc, had a schematic inside

> useful.  But then early PC's sometimes included schematics in their
> end-user documentation.

Yes, and most of them were very close to the schematics in the IBM 
TechRefs :-) 

-tony