mirror of
https://github.com/dlidstrom/hp48page
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73 lines
1.7 KiB
HTML
73 lines
1.7 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>The HP48-Guestbook</TITLE>
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<BODY TEXT="#000000"
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LINK="#7FFF00" VLINK="#FF0000">
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<META NAME="keywords" CONTENT="HP48, ml, sys, rpl, daniel, lidström, lidstrom">
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<META NAME="description" CONTENT="Great page! Come see!">
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<META NAME="generator" CONTENT="Notepad">
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<META NAME="author" CONTENT="Daniel Lidström">
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<BASE HREF=">
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<SCRIPT LANGUAGE="JavaScript">
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</SCRIPT>
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</HEAD>
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<BODY>
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<CENTER>
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<FONT SIZE="+5" FACE="hp48gos3">HP48 Sources Page.</FONT> <P>
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<HR>
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This program measures the clock speed of your HP48. <P>
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</CENTER>
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<H1>Processor speed</H1>
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<CODE> <PRE>
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CODE
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GOSBVL =SAVPTR save the internal pointers
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ST=0 15 turn off interrupts
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INTOFF turn off keyboard interrupts
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GOSUB waitkeyup wait for user to let go of key
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GOSBVL =DispOff turn off the display
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* yes, it's that easy
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GOSBVL =clkspd measure clock speed
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* A[A] = speed/16
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GOSBVL =DispOn turn on display
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INTON turn on keyboard interrupts
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ST=1 15 turn on all interrupts
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R0=A.F A prepare to push R0[A]
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GOSBVL =PUSH# push R0[A] to stack, restore pointers
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GOSUB srpl put the following data on the return-stack
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CON(5) =DOCOL start a program
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CON(5) =UNCOERCE convert "bint" to float
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CON(5) =%16 multiply by sixteen
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CON(5) =%* *
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CON(5) =SEMI end program
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srpl C=RSTK pop address of data into C[A]
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A=C A
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PC=(A) branch (execute) program
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waitkeyup
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LC(3) #1FF look for all keys
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OUT=C set the OUT register
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GOSBVL =CINRTN read the IN register
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LA(5) #0803F load mask
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A=A&C A mask out keys
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?A#0 A any keys down?
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GOYES waitkeyup yes, check again
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RTN return
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ENDCODE
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</PRE> </CODE>
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</BODY>
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</HTML>
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