Activity for Alberto Donda
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Alberto Donda modified a comment on discussion General Discussion
Exact! Thank you to both! Yes I'm teaching F.P. at school, this days. IEEE754 is on the book and that's what we are studing, but i dont see any problem in observing some practical (storical?) application. Used bits are exactly the same, just in different position. Both formats use 8 bit for exponent, 1 for sign and 23 for the mantissa. The IEEE754 uses a 127 bias for the exponent while "basic" uses 128 (if i'm not wrong) The "bill gates" solution seems more smart because it alligns the exponent to...
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Hello, try: 10 A=1E20 20 B=1E20 30 C=A^B the last instruction brings to an immediate and unrecoverable jamming of the PCBASIC (15.08.12)
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Exact! Thank you to both! Yes I'm teaching FB at school, this days. IEEE754 is on the book and that's what we are studing, but i dont see any problem in observing some practical (storical?) application. Used bits are exactly the same, just in different position. Both formats use 8 bit for exponent, 1 for sign and 23 for the mantissa. The IEEE754 uses a 127 bias for the exponent while "basic" uses 128 (if i'm not wrong) The "bill gates" solution seems more smart because it alligns the exponent to...
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Hello, I made a small demo capable to show a fp variable in binary... 5 cls 10 V=10:P=VARPTR(V) 20 DEFSEG=&H13AD:Y=15 30 LOCATE 20,1:INPUT V 40 FOR XX=0 TO 3 50 X=55-(XX*18):N=PEEK(P+XX) 60 LOCATE Y-1,X+7: IF XX=3 THEN PRINT"e" ELSE PRINT"m" 65 IF XX=2 THEN LOCATE Y-1,X+1: PRINT "s" 70 GOSUB 500 80 NEXT XX 90 GOTO 30 500 LOCATE Y,X:PRINT CHR$(218);CHR$(196); 510 FOR I=1 TO 7: PRINT CHR$(194);CHR$(196); :NEXT I: PRINT CHR$(191) 520 LOCATE Y+1,X: FOR I=1 TO 9: PRINT CHR$(179);" "; : NEXT I 530 LOCATE...
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Ok, after all... the lesson was a success: I managed to download an old Paint program for PC, still having the "BSAVE" format option in the save menu. It came with various PCX examples, so it was easy to save a CGA image. Unfortunately it refuse to save multi plane modes, so no EGA. Anyway, here it is the image, if someone wants to try it for fun... Just copy it in your work directory (check with "files" command) and then type: SCREEN 1 BLOAD "home.bsv" a nice image will appair! : ) (Not bad, considering...
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Hello again, I'm keeping to use the PCBasic with my pupils at school. Now we have studied the Floating Point standard (single precision-4 bytes) on the book, and I would be interesting to verify it on PC basic. I managed to get the location where is stored a variable but I'm not sure to understand. For sure the 4 byte i'm reading are changing if I change the variable, but this internal representation seems not clear to me. What standard it follows? Is the same of original GWbasic (emulated) ...or...
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Many thanks. All your informations are interesting and usefull. But after many hours spent try to make them work, I must resign because there is no time left for me. I undestand, with a bit of surprise, that there is nothing of ready to use. BSAVEViewer, for example, would be great... if only had just one example image to load! So we return to my original problem: I cant locate any ready image to bload with basic... Even the frog is not ready, I was plannig to let it calculate, then BSAVE it and...
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Many thanks. All your informations are interesting and usefull. But after many hours spent try to make them work, I must resign because there is no time left for me. I undestand, with a bit of surprise, that there is nothing of ready to use. BSAVEViewer, for example, would be great... if only had just one example image to load! So we return to my original problem: I cant locate any ready image to bload with basic... Even the frog is not ready, I was plannig to let it calcualte, then BASVE it and...
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By the way, in the homepage is stated: "PC basic can emulate CGA EGA and VGA" ... but there are no VGA modes in the documentation (SCREEN command). So is it actually possible to enter some VGA modes, like the classic 320x200x256?... yes or not? I'm pretty confused on this point...
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In the PC-basic homepage, we can see a "Frog" image on the right, near some other games and demo screens. Can please someone post or send me the file with the frog? (I need it, at school, as graphic image to load in memory to demonstrate the EGA working, and I'm unable to find anything to load!) (So the request is for the "frog.raw"... or any other EGA image to Bload... ) (Please, help me if you can: time is running and the lesson is scheduled on day 4, so there are only 2 days left!)
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In the PC-basic homepage, we can see a "Frog" image on the right, near some other games and demo screens. Can please someone post or send me the file with the frog? (I need it, at school, as graphic image to load in memory to demonstrate the EGA working, and I'm unable to find anything to load!) (So the request is for the "frog.raw"... or any other EGA image to Bload... ) (Please: time is running and the lesson is scheduled on day 4, so there are only 2 days left!)
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In the PC-basic homepage, we can see a "Frog" image on the right, near some other games and demo screens. Can please someone post or send me the file with the frog? (I need it, at school, as graphic image to load in memory to demonstrate the EGA working, and I'm unable to find anything to load!) (So the request is for the "frog.raw"... or any other EGA image to Bload... )
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Hello, I'm using PC-Basic at school, to show pupils some examples of direct access to graphic memory. I.e: SCREEN 9 : DEF SEG=&HA000 POKE 0,255 Now, just to perform some more than a pixel toggling on screen, it would be nice to load a complete image. Question is: does somebody knows which tools to use for this? I cant locate anything usefull on internet. May be because too many time is passed since EGA was the standard. Not easy to do from scratch, because you have to manage separately 4 bitplanes,...
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Hello, I'm using PC-Basic at school, to show pupils some examples of direct access to graphic memory. I.e: SCREEN 9 : DEF SEG=&HA000 POKE 0,255 Now, just to perform some more than a pixel toggling on screen, it would be nice to load a complete image. Question is: does somebody knows which tools to use for this? I cant locate anything usefull on internet. May be because too many time is passed since EGA was the standard. Not easy to do from scratch, because you have to manage separately 4 bitplanes,...
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