Memory Reallocation

[Sylvain Cote]

(12-08-2018 05:00 PM)Dieter Wrote:  The capacily is 67 registers (!) of 7 bytes each.

Hello Dieter,
Yeah, I agree that 67 registers might seem strange at first but it may not be upon close examination.
I have not validated what I am about to say, but bear with me.
HP used 16 registers chips at the time and lets assumed that the HP-15C had five of those chips inside the SOC. (system on chip)
If that is the case then we have 80 registers total, minus the stack (5 registers), the PC & 7 levels return stack (3 registers), the flags, scratch & other usages (5 registers) for a total 67 registers left.
This is just an intuition and not at all proven, but still it could make sense.
Sylvain