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(HP71B) ASM question
09-25-2024, 07:18 AM (This post was last modified: 09-25-2024 07:48 AM by J-F Garnier.)
Post: #28
RE: (HP71B) ASM question
(09-24-2024 12:00 PM)floppy Wrote:  AND: an overtaking of the GAMMA function of the Math module is currently analyzed: however, the BASIC ASM function I got from JF Garnier seems to use stack mechanisms I could not reconduct on Forth/ASM (for sure, the Forth has stack mechanisms). So, the idea is to have a GAMMA Forth/ASM (low prio); however the path to it is still not found. Any hints are welcomed.

The gamma asm code from the Math ROM (the dogam subroutine) should be useable in a Forth primitive, rewriting only the wrapper code to interface with the Forth environment.

The code is referring to a "math scratch stack", like:
Code:
     GOSUB  =stscr+   store it to math scratch stack
     GOSUB  =rcscr+   recall from math scratch stack

The HP naming is confusing, because there is also a "Math stack", specific to BASIC, to hold parameters and results during BASIC expression evaluation.
The "math scratch stack" is different, it's a reserved fixed place in the system memory implementing a 4-level stack to hold temporary extended precision values during numeric calculations.
So I believe it's perfectly useable in Forth too.

J-F
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Messages In This Thread
(HP71B) ASM question - floppy - 07-15-2024, 04:50 PM
RE: (HP71B) ASM question - ThomasF - 07-16-2024, 06:05 AM
RE: (HP71B) ASM question - floppy - 07-16-2024, 07:22 AM
RE: (HP71B) ASM question - rprosperi - 07-16-2024, 12:07 PM
RE: (HP71B) ASM question - ThomasF - 07-16-2024, 07:00 AM
RE: (HP71B) ASM question - floppy - 07-23-2024, 05:54 PM
RE: (HP71B) ASM question - rprosperi - 07-23-2024, 06:10 PM
RE: (HP71B) ASM question - floppy - 07-29-2024, 09:25 AM
RE: (HP71B) ASM question - brouhaha - 07-30-2024, 06:47 AM
RE: (HP71B) ASM question - J-F Garnier - 07-30-2024, 07:54 AM
RE: (HP71B) ASM question - KeithB - 08-03-2024, 10:56 PM
RE: (HP71B) ASM question - brouhaha - 08-05-2024, 04:21 AM
RE: (HP71B) ASM question - J-F Garnier - 08-05-2024, 02:12 PM
RE: (HP71B) ASM question - J-F Garnier - 07-30-2024, 07:28 AM
RE: (HP71B) ASM question - brouhaha - 07-30-2024, 06:51 AM
RE: (HP71B) ASM question - floppy - 08-03-2024, 04:47 PM
RE: (HP71B) ASM question - rprosperi - 08-03-2024, 05:06 PM
RE: (HP71B) ASM question - floppy - 08-03-2024, 05:40 PM
RE: (HP71B) ASM question - floppy - 08-04-2024, 11:45 AM
RE: (HP71B) ASM question - rprosperi - 08-05-2024, 11:50 AM
RE: (HP71B) ASM question - floppy - 08-17-2024, 08:46 AM
RE: (HP71B) ASM question - floppy - 08-17-2024, 01:40 PM
RE: (HP71B) ASM question - floppy - 08-22-2024, 09:32 AM
RE: (HP71B) ASM question - floppy - 08-23-2024, 07:37 AM
RE: (HP71B) ASM question - floppy - 09-03-2024, 03:36 PM
RE: (HP71B) ASM question - floppy - 09-24-2024, 12:00 PM
RE: (HP71B) ASM question - J-F Garnier - 09-25-2024 07:18 AM
RE: (HP71B) ASM question - floppy - 10-07-2024, 11:24 AM
RE: (HP71B) ASM question - floppy - 10-16-2024, 10:00 AM
RE: (HP71B) ASM question - floppy - 10-18-2024, 08:55 AM



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