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Cortex BASIC on a 64K Guidry Cartridge


Stuart

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I've done a bit of work on my port of Cortex BASIC so it can now be programmed into a 32K EPROM on a 64K Guidry bank-switched cartridge, and selected from the TI main menu. When run from a cartridge, just over 14K of RAM is available for program and variable storage (compared with around 5K of RAM free when loading the program as an E/A option 3 file).

 

Details, including a link to the EPROM binary image, are here: <http://www.avjd51.dsl.pipex.com/ti/ti.htm#programs>.

 

If you want a little program to try out ...

 

10 GRAPH : XS=2: YS=2

20 A=256: B=A*A: C=192

30 FOR X=0 TO A STEP XS: S=X*X: P=SQR[b-S]

40 FOR I=-P TO P STEP 6*YS

50 R=SQR[s+I*I]/A

60 Q=(R-1)*SIN[10*R]

70 Y=INT[i/3+Q*C]

80 IF I=-P THEN M=Y: N=Y

90 IF Y>M THEN M=Y

100 IF Y<N THEN N=Y

110 IF (M=Y OR N=Y) THEN X1=X/2: Y1=100-Y/2: PLOT 128+X1,Y1: PLOT 128-X1,Y1

120 NEXT I

130 NEXT X

140 GOTO 140

 

Stuart.

Edited by Stuart
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Excellent job Stuart! I'll be trying this out on the real hardware when I get a chance! :thumbsup:

Thanks for those three boards. They're all built up and work fine. ;-)

 

(Mark, to return the favour, do you need some 74LS379s for your boards? I bought 10, and only need three plus a spare, so the remainder are yours for the asking. Ditto for the two caps on each board as well.)

Edited by Stuart
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Correct - it's a 25K file. I didn't bother padding it out to the full 32K. If you pad to 32K and duplicate, and set the jumper to 32K, I think it should work (A15 will be held high so it will use the copy of the code in the upper half of the EPROM?). You can always just erase the EPROM if it doesn't work ...

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