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| Latest Threads |
location of heap manageme...
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non-paged supervisor code...
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How to open fuse as an ex...
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Old zxbasic game errors
Forum: Help & Support
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Error: Undefined GLOBAL l...
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A Fast(er) Plot Routine f...
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Hall of Fame - Include fo...
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[SOLVED] Array layout bug...
Forum: Bug Reports
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3DOS Commands?
Forum: Help & Support
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CLS/Fade out ASM Sub-rout...
Forum: How-To & Tutorials
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2025-10-05, 03:39 PM
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| Download links broken |
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Posted by: xthunderheartx@gmail.com - 2025-02-17, 03:03 AM - Forum: Bug Reports
- Replies (3)
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Hey I just tried to download (from all the links) and got nothing. Links look good but boriel.com/files appears to be empty. Is that right? It's Sunday night so maybe it's maintenance?
Thanks - Dallas
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| 2D Array Errors |
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Posted by: raymondlesley - 2025-02-13, 04:42 PM - Forum: Bug Reports
- Replies (1)
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I've been enjoying using ZX BASIC so far. It's great to have something that's easy to use (and in-keeping with the original Sinclair BASIC). I have come up against an issue which I can't find a solution for:
The compiler supports multi-dimensional arrays, but it throws an error if I attempt to get a "slice" of the data.
My code:
Code: DIM data_array(0 TO 2, 0 TO 3) AS UByte = { _
{0, 1, 2, 3}, {4, 5, 6, 7}, {8, 9, 10, 11} _
}
DIM element12 AS UByte = data_array(1, 2)
DIM element0(0 TO 3) AS UByte
element0 = data_array(0) ' throws an error
I get no errors relating to element12
I would expect that element0 should result in {0, 1, 2, 3}. It's the right "shape". Instead I get an error:
Quote:
array_test.bas:9: error: Syntax Error. Unexpected token '(' <LP>
I've tried variants e.g. data_array(0, : ) or data_array(0,0 TO 3). Nothing seems to work.
I'm using ZX BASIC 1.17.2
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| Breaking loops |
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Posted by: baltasarq - 2025-02-07, 01:28 PM - Forum: Bug Reports
- Replies (9)
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Out of simple routine, I created a for loop like this:
Code: for i = 0 to ubound(m)
if m( i ) = 0
break
end if
next
At first, I did not understand what was happening. break was not working. But there was not any error or even a warning. Then I realized: break is not a part of Basic. It never was.
The strange point is the absence of any error or warning. Either this was included in the grammar by error, or maybe because it is planned for inclusion.
I don't know.
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| Filling drawings |
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Posted by: baltasarq - 2025-02-07, 01:16 PM - Forum: Help & Support
- Replies (3)
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There's no function or command "fill", allowing to pass two coordinates and making the computer to fill all delimited pixels with the current color.
Code: circle 50, 50, 30
fill 50, 50
In the eighties, I used to fill a circle with a for loop:
Code: circle 50, 50, 30
for i = 1 to 30
circle 50, 50, i
next i
Thanks,
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| Headerless load routine in ZX Basic |
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Posted by: Maywind - 2025-02-04, 06:19 AM - Forum: Help & Support
- Replies (2)
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Hello,
I'm trying to code a simple headerless LOAD routine in ZX Basic using the inline assembly feature of the compiler. The basic idea here is to write a function that uses assembly to set up the necessary registers and call the ROM routine 0556h for a headerless load (e.g. to load an extra level from the tape). I have some progress in this area, but it looks like I misunderstand how to clean up things correctly after the ROM routine returns and my function ends, so the poor Speccy either hangs or is reset after the code loading routine completes. I tried a few things so far, but the experiment that went the farthest so far is this one:
Code: function hload(addr as uInteger, size as uInteger) as uByte
asm
pop hl
pop de
pop ix
ld a, 255
scf
call 0556h
push hl
end asm
end function
The expected result is that calling this function, for instance, in this way:
should be able to load standard ZX screen data correctly. Trying to load a screen this way indicates that the screen is indeed loaded into the right area of memory, but once the loading completes, the computer is reset.
I'm pretty sure that this indicates that something is screwed up at the end of the function call. Could be due to the fact that SP or something else is modified from within 0556h and that changes the register state, or something else along those lines, but I can't quite figure it out :/ I would appreciate some help since I'm not sure how to proceed. I tried a few other cleanup tricks, but none of them worked.
Another question is: how do I properly return a value from this function? As far as I understand, the return value can be stored in the A register. Suppose I wanted to indicate that the tape loaded correctly with a value of 0, would I simply LD A, 0 at the end of the function and that would be enough? This, of course, is a separate issue once I can actually get this function to load anything without resetting the PC or hanging 
Thanks in advance.
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| Question on file extension |
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Posted by: zedex82 - 2025-01-18, 11:11 PM - Forum: Help & Support
- Replies (2)
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I am working my way through the book 'Boriel Basic for Beginners'. It is a very good book and well written. I have convinced my friend to buy a copy too.
On page 166 in the example the first command is '#INCLUDE "ship.gdu.bas". When I exported the UDG's as per the instructions on page 165 it creates a file 'ship.gdu.zxbas'
I was wondering why it did not export with the extension '.bas'. I understand I just need to change the extension in the code and it loads in fine, I just want to understand why. It may be something I have done wrong.
ZeDeX82
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