Pascal Apple Pascal 1.3 Compiler Error

Pascal is amazing! Unfortunately I've only experienced Borland's Turbo Pascal on CP/M and DOS systems.

That said... The code looks fine, but I would like to see a semicolon after the WriteLn statement - but I recall that ISO dialects of Pascal is OK to skip it before an End.

Are there maybe some compiler options in a menu for memory management that has been switched by accident?

Maybe the compiler directives differ from dialect to dialect, but isn't {S+} for stack checking?

Seems like you've found a genuine bug in the compiler

_SDGOL_ said:

Except that the guy in the video above isn't having this problem. So, corrupted disk?

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I guess that's a lot more likely than a genuine bug.

Hello, Eric. It looks like I am a couple years late in finding your question, but I may have some information (if not a solution) in the event that you're still interested.

First of all, your program is correct, as best I can tell, and it runs fine in Apple Pascal v1.3 on my Apple IIc (with or without the swapping directive). According to the Apple Pascal Language Reference Manual, the error 58 you are getting is "Error in factor (bad expression)" for whatever that is worth.

I don't have an Apple IIe, but if I run the same program in the linapple emulator, then I also have to turn swapping on to compile the program, and it also fails. When swapping is on, it errors on the END statement as well, but with an error 20 ('.' expected) even though the program does end with a period. If I turn on super-swapping with {$S++}, then I get error 168 (Undefined label) on the same line.

The truth is that I have had problems with v1.3 on the linapple emulator in my own experience with small and relatively large Pascal programs. Until I saw the issue you were having, I thought that the problem was likely a bug in the emulator. Now, I am not so sure.

If you're up for trying again, I'd suggest you try Apple Pascal v1.2 on your machine. I have had much better luck with this version on linapple. For my own code, I test as I go on v1.2 on linapple, and then when I am happy with the program, I transfer it to a floppy and compile it on v1.3 on my IIc.

Best of luck,
den

Eric's Edge said:

I tried out Pascal 1.1 and the code worked fine. Also, I contacted the person who created this video and he offered to send my his copy of his disks.

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Also, I notice in this video that he is set up for 128KB, the same as what a IIc has. A stock IIe comes with 64KB, if I'm not mistaken. Apple Pascal v1.3 is supposed to support 64KB. It's actually the default, and you have to swap a couple of files if you want the 128KB Pascal environment. Still, that might be what's making the difference.

Eric, how much memory does your IIe have?

I'll be interested to see how you fare. Your original post mentioned a "lack of accessible books and tutorials." A lot of books are available in PDF format online, including the Language Reference Manual I mentioned above. If you prefer real books, like I do, you can usually find them pretty cheap on eBay. People are paying high prices these days for old computers, but not always so much the books for those computers. If you're patient, you can usually find something for $10-15.

Also, if you're interested, I'm slowing going through the book Apple Pascal Games (which, incidentally, I got on eBay). I've got a GitHub repo where I'm putting the author's original programs as well as my own versions with a few enhancements. I'm just finishing up Chapter 2 at present, but by the time you've gotten back into Apple Pascal, there should be a bit more.

Well, since you did say that it's never too late for a response, I wanted to chime in and say that I ran into the issue that you were having @Eric's Edge , and managed to fix it.

I was following the guide here to set up my Apple Pascal 1.3 system:


And toward the end, he has you load and run some of the demo code that comes with Apple Pascal to test out that your installation is working. No matter which example code I tried, I got a Stack Overflow error.

I then found this discussion and typed your code in exactly as it appears above. This time no stack overflow, but the same errors that you're reporting.

After seeing the responses from @dCubed above, I decided to try it on actual hardware -- an Enhanced Apple IIe -- but I ran into the exact same issues.

After much tearing my hair out, I went and bought the $20 CD/Zip that is referenced for sale at Juiced in the article that I linked above:


Most of it is irrelevant to me, since I don't have a IIGS and that seems to be what it's focused on. However, it does contain a clean set of all four Apple Pascal 1.3 disk images, plus a fifth image that contains the latest patches. They're a different set than the ones I found floating about various places online (and the fifth disk was entirely new).

I built the system following the exact same steps, but using those disks and both your code and all the sample code compiled and ran perfectly.

So, there you have it. Since it's available for sale, I'm not sure what the legality of distributing the disk images is, although apparently-faulty disk images of the same disks abound. But I do have both the working images purchased above and a 10MB .po hard disk image with the installed (128K) system, which loads and runs on both actual hardware (using a FloppyEMU and YellowStone disk controller) and under emulation using AppleWin just fine.