Structured Fortran - was Re: Self modifying code, lambda calculus

Chuck Guzis cclist at
Tue Sep 22 17:29:45 CDT 2015

On 09/22/2015 01:35 PM, Rick Bensene wrote:

> There were no index registers on this machine, only a single
> accumulator register (implemented as a shift-register).

Not that uncommon, really. It was only Model II of the 1620 that had 
index registers; the CADET didn't.  No accumulator either--just a simple 
2-address architecture.    It did have (optional) indirect addressing, 
however, which was a godsend if you had it.  Otherwise, you really did 
have to plug instructions.

But even the 650 had a TLU instruction...


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