Build your own Apollo Guidance Computer

[Chuck Guzis]

On 19 Dec 2006 at 16:54, Jeff Walther wrote:

> Is there a guide somewhere to the different families of logic, such 
> as RTL, TTL, LSTTL (never heard of that one) and CMOS?   I was 
> choosing some simple logic components for my IIfx SIMM project the 
> other day and was somewhat bewildered by the choice of input/output 
> levels.   Also, some are Schmidt Triggered?

SIgh.  Googling around, I find not a lot of detail on the logic 
families, or that they've now become the exclusive domain of 
engineering textbook writers and EE professors.

If you can get your hands on one, the big old Motorola Integrated 
Circuit data book from about 1969 is an excellent reference on RTL, 
ECL, DTL, HTL, TTL and even some MOS (not CMOS).  While a few things 
have been added (like CMOS logic), the basic principles of operation 
haven't changed much.

The very interesting thing about RTL was that the ICs could be 
operated in the linear region for lots of non-logic applications.

Cheers,
Chuck