Variables and functions not found when they really are there

[jgharston]

Using test program at http://mdfs.net/temp/vdata.zip

Unzip, will give:
ViewData Acorn tokenised BASIC program
0 Teletext page file

From Brandy, CHAIN "ViewData". Teletext test page displayed ok. Press Escape. Gives error:
Cannot find function 'FNerr'
LIST
Program has vanished.
LOAD "ViewData"
LIST 1140,1160 - the function definition is there.
PRINT FNerr
Cannot find variable 'flg%' at line 1150
Ok. flg%=0:PRINT FNerr
Cannot find variable 'flg%' at line 1150
Yerwot???

If I edit line 1150, delete flg% then retype it, doing flg%=0:PRINT FNerr works. If I RUN the program it goes back to the initial problem, FNerr not found, program vanishes.

I'm trying to track down what is causing this and trying to create a minimum test case.

Matrix v1.22.10 (MinGW/x86-32/SDL) 14 Feb 2021

[soruk42]

Trawling back to very old versions via git, the version prior to where I merged your Banana Brandy changes fell over with Unsupported BASIC V feature on the USR&FFDD statement on line 1510. After the merge, it fell over with a segfault on 64-bit, and losing its program on 32-bit on an error condition. But I am quite confused......

[soruk42]

Incidentally, OSFILE via &FFDD is not supported, but is a no-op.

[jgharston]

On 11-03-2021 13:34, Michael McConnell wrote: Trawling back to very old versions via git, the version prior to where I merged your Banana Brandy changes fell over with Unsupported BASIC V feature on the USR&FFDD statement on line 1510.

Odd, it shouldn't even be getting that far. IF PAGE<&FFFF THEN BBC API call PAGE is &verybignumber something like &015D0000 on my system.

After the merge, it fell over with a segfault on 64-bit, and losing its program on 32-bit on an error condition. But I am quite confused......

Me too. :)

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-- J.G.Harston - ***@***.*** - mdfs.net/jgh

[soruk42]

Ah, in those old versions the addressing was relative to the workspace memory block so PAGE=0.