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+--- Thread: Online HP-80 and HP-70 emulations (/thread-21095.html)
Online HP-80 and HP-70 emulations - van2z - 01-02-2024 06:56 PM
I finished emulation of the hp-80 and hp-70:
https://veniamin-ilmer.github.io/hp80/
https://veniamin-ilmer.github.io/hp70/
A few notes of interest:
* HP-80 was the first calculator to call Keys -> Address instruction more than once for the same key stroke. It does this because it had to jump to the same location, but in a different rom.
* The HP-80 swapped the key codes between the top row (n,i,pmt,pv,fv) and the bottom (x,1,2,3). This was not swapped on the HP-70.
* For some reason, when you first power up the HP-70, it has "12" stored inside of K.
RE: Online HP-80 and HP-70 emulations - Thomas Klemm - 01-02-2024 07:17 PM
(01-02-2024 06:56 PM)van2z Wrote: https://veniamin-ilmer.github.io/hp70/
Just in time for: Musings on the HP-70
(01-02-2024 06:56 PM)van2z Wrote: * For some reason, when you first power up the HP-70, it has "12" stored inside of K.
Later business-models even had 12× and 12÷ as separate keys.
It is useful to translate between yearly and monthly iterest rates.
Thanks a lot for your contributions.
RE: Online HP-80 and HP-70 emulations - teenix - 01-02-2024 08:13 PM
(01-02-2024 06:56 PM)van2z Wrote: * For some reason, when you first power up the HP-70, it has "12" stored inside of K.
Here is the code that does this when the calculator starts up.
Code:
set the storage memory address pointer to 1
$03D5 0CE 0 -> c[w] C=00000000000000
$03D6 30C 12 -> p P=12
$03D7 1E2 c + 1 -> c[p] C=01000000000000
$03D8 270 c -> data address
put 12 into the C register
$03D9 1E2 c + 1 -> c[p] C=02000000000000
$03DA 24E shift right c[w] C=00200000000000
$03DB 1E2 c + 1 -> c[p] C=01200000000000
$03DC 1EA c + 1 -> c[x] C=01200000000001
transfer C register to storage memory[1]
$03DD 2F0 c -> data C=01200000000001cheers
Tony