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+--- Thread: SR-51A Rare ? (/thread-3175.html)
SR-51A Rare ? - hp41cx - 02-22-2015 02:15 PM
This 51-A is original or has been changed?
Blue keys?
SR-51A Rare?
RE: SR-51A Rare ? - Marcus von Cube - 02-22-2015 06:23 PM
(02-22-2015 02:15 PM)hp41cx Wrote: Blue keys?
A quick look at Jörg's datamath.org site shows that even the non-"A" SR-51s had yellow keys. So it must be a frankencalc with components from an SR-50.
RE: SR-51A Rare ? - d b - 02-23-2015 12:02 AM
(02-22-2015 06:23 PM)Marcus von Cube Wrote:(02-22-2015 02:15 PM)hp41cx Wrote: Blue keys?
A quick look at Jörg's datamath.org site shows that even the non-"A" SR-51s had yellow keys. So it must be a frankencalc with components from an SR-50.
I accidentally happen to have those units and yes; that could be. It could also be at the end of the run and assembled from whatever fit. To prove that though; we'd have to check serial numbers. I know National Semiconductor would "make the best of a bad job" with what parts were at hand.
Let's believe in the frankencalk.
RE: SR-51A Rare ? - walter b - 02-23-2015 06:16 AM
(02-23-2015 12:02 AM)Den Belillo (Martinez Ca.) Wrote: Let's believe in the frankencalk.
Simply the wrong functions at the wrong position.
No need for believing.d:-)
RE: SR-51A Rare ? - Didier Lachieze - 02-23-2015 07:42 AM
(02-23-2015 06:16 AM)walter b Wrote: Simply the wrong functions at the wrong position.What's wrong?
in addition to the blue keys there are also white and grey keys that differ from the standard 51A:
RE: SR-51A Rare ? - Gene - 02-23-2015 01:10 PM
This is relatively easy to create if one has an SR-50 and an SR-51A. I made one once for fun.
The keys are totally interchangeable as long as the function printed on the top is the same.
Looks fun!