(42S) Programmable Speed-Up in User Code
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05-04-2017, 03:05 AM
(This post was last modified: 06-15-2017 01:48 PM by Gene.)
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(42S) Programmable Speed-Up in User Code
[The following was posted by Chris Bunsen (d. 31 January 2013) on the comp.sys.handhelds newsgroup on 13 September 1991. It appears here as a kind of tribute to his memory. -jkh-]
My my my.... So nice to hear about happy HP-42 owners. The HP-42 was a true labor of love, (arent they all?) .. In that light, here's a little jewel that demonstrates a programmable speed-up in USER code. I will not/can not/please dont ask me/ explain how come it works, but it was a lot of fun. By the way, the little bugger has more matrix functions and abilities than ANY OTHER HP handheld. 1 LBL TT test 2 BEEP 3 XEQ TURBO 4 BEEP 5 TONE 9 6 RTN 7 LBL TURBO 8 "////" Four Divide keys 9 111 Rate + 16 * Cont[0:3] Rate = 15; Cont = 16h 10 XTOA 11 160 Dtst + 16 * Dcont Dtst = 0; Dcont = 0Ah 12 XTOA 12.5 _"////" (Untested)--finish filling out ALPHA number with 0s 13 20360 Magic constant to recall Alpha reg as a real 14 8124 Magic constant to store a Complex number over Ctl regs 15 RCL REGS save REGS 16 CLV REGS Create bug which allows peek/poke 17 SF 25 18 CLsigma Now REGS doesn't and does exist! 19 RCL IND ST Z Recall Alpha data as number 20 1,000,077 Will store complex--must keep timers going 21 RECT 22 COMPLEX 23 STO IND ST Z Store magic numbers into HDWR registers 24 X<>Y get REGS back 25 STO REGS 26 END After running, CPU will run faster. ON key for any reason will restore slower rate. Batteries don't last long under this regime, and die sooner-- in fact operation is not guaranteed at all. I had to fix the bug that made this possible; I think the REV Bs and REV C are "FIXED", but all REV As Ive tried will respond well.... Keep on enjoying our products, Thank you thank you thank you, Chris "RPN LIVES" Bunsen HP -Calc Lab Corvallis, OR <0|ɸ|0> -Joe- |
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05-04-2017, 06:20 AM
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RE: (42S) Programmable Speed-Up in User Code
It doesn't work in Free42!! ;-)
Werner 41CV†,42S,48GX,49G,DM42,DM41X,17BII,15CE,DM15L,12C,16CE |
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05-04-2017, 12:45 PM
Post: #3
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RE: (42S) Programmable Speed-Up in User Code
(05-04-2017 06:20 AM)Werner Wrote: It doesn't work in Free42!! ;-) LOL! Free42 must have been based on Rev C. --Bob Prosperi |
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05-04-2017, 04:39 PM
(This post was last modified: 05-04-2017 09:23 PM by anetzer.)
Post: #4
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RE: (42S) Programmable Speed-Up in User Code
Can anyone please educate me about step 12.5? How is it entered?
Plus one question out of sheer laziness: How does one check which Rev. a calc belongs to? Thanks! a |
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05-04-2017, 05:01 PM
Post: #5
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RE: (42S) Programmable Speed-Up in User Code
(05-04-2017 04:39 PM)anetzer Wrote: Plus one question out of sheer laziness: How does one check which Rev. a calc belongs to? For the HP-42S: http://www.hpmuseum.org/cgi-sys/cgiwrap/...read=73353 |
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05-05-2017, 06:23 PM
Post: #6
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RE: (42S) Programmable Speed-Up in User Code
Probably the same effect as described here: HP-42S Fast Mode under program control
I once made a short video about this trick, see HP-42S Fast Mode Anybody out there if that works also for the 17B(II) und 27S? |
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05-05-2017, 06:55 PM
Post: #7
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RE: (42S) Programmable Speed-Up in User Code
Woohoo. someone referenced that web page of mine from a LONG time ago now. :-)
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05-05-2017, 07:33 PM
Post: #8
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RE: (42S) Programmable Speed-Up in User Code
OT: Gene you should have it in the signature. I'm going to read it and putting it in the wiki4hp
Wikis are great, Contribute :) |
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05-10-2017, 07:28 AM
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RE: (42S) Programmable Speed-Up in User Code | |||
05-10-2017, 04:13 PM
Post: #10
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RE: (42S) Programmable Speed-Up in User Code
Thank you all!
a. |
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