mirror of
https://github.com/dlidstrom/hp48page
synced 2024-11-16 07:47:37 +01:00
97 lines
2.4 KiB
HTML
97 lines
2.4 KiB
HTML
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<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, lidstr<74>m, 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 Lidstr<74>m">
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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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Here's a little program that produces a nice effect on the screen. <BR>
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</CENTER>
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<H1>DEMO1</H1>
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<PRE><CODE>
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Size: 122.5 Checksum: # D5FCh
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::
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RECLAIMDISP (clear the screen)
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TURNMENUOFF (turn the menu off)
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CODE
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GOSBVL =SAVPTR save internal pointers
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GOSBVL =DisableIntr turn off all interrupts, yes go ahead, ON-A-F won't work!
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GOSUB waitkeyup wait for user to let go of key
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GOSBVL =D0->Row1 D0,A[A] -> top left corner of display
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R0=A.F A save here
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D1=(5) =CRC D1 -> hardware checksum, try changing this to =TIMER1
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toplp C=R0.F A get screen address
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D0=C point D0 here
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LC(5) #3F
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B=C A B[A] = 64-1 (64 pixel rows)
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drawlp C=DAT0 4 read from screen to randomize hardware checksum
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C=DAT1 4 read hardware checksum
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P= 3
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A=C WP fill A[W] with C[WP]
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GOSBVL (=ASLW5)+3 | shift A[W] left 4 times
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A=C WP |
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GOSBVL (=ASLW5)+3 |
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A=C WP |
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GOSBVL (=ASLW5)+3 |
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A=C WP |
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DAT0=A W write it out to screen
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D0=D0+ 16 point D0 to next 64 (16*4) pixels
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DAT0=A W write again
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D0=D0+ 16 ...
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DAT0=A 2 and the last 8 pixels
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D0=D0+ 2 D0 points to next row
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B=B-1 A
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GONC drawlp loop until done
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P= 0
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* read the keyboard
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LC(3) #1FF load keyboard rows
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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) #803F | set mask for all keys
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A=A&C A | mask out keys
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?A=0 A were any keys down?
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GOYES toplp no, draw screen again
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GOSUB waitkeyup yes, wait for user to let go of key
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GOSBVL =AllowIntr turn on interrupts again
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GOVLNG =GETPTRLOOP exit back to rpl, restoring pointers
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* wait here until no keys are down
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waitkeyup
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LC(3) #1FF load keyboard rows
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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) #803F | 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, wait again
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RTN return
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ENDCODE
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;
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</FONT>
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</PRE></CODE>
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</BODY>
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</HTML>
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