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| Float variable stores only integer value. Why ? |
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Posted by: Eqx - 2016-10-29, 05:08 AM - Forum: Help & Support
- Replies (3)
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I'm doing my first tests with ZX Basic. I've tried to create a timer and I found the following issue
Code: REM timer test
DIM t1 as float = 0.00
border 0:paper 0:ink 2:cls
while (0=0)
t1 = (65536 * peek 23674 +256 * peek 23673 + peek 23672) /50
pause int(10+25*RND)
t1 = ((65536 * peek 23674 +256 * peek 23673 + peek 23672) /50) -t1 REM t1 ignores decimal part and has been declared as float
print at 0,0;t1 REM result is always 0 or 1
if inkey$="s" then
end
end if
wend
In example, t1 is declared as float but the variable only stores the integer value, and the final result is wrong. In this case print result is always 0 or 1, ignoring the decimal part
There is something that escapes me or i don't understand?
The same example adapted to Sinclair basic displays and store decimal part correctly.
Thanks in advance
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| bug or missunderstood? |
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Posted by: Haplo - 2016-10-27, 05:35 PM - Forum: Bug Reports
- Replies (5)
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Hello, if I run this program:
Code: cls
dim a,b as ubyte
dim dw1,dw2 as uinteger
dim valor as uinteger
a=10
b=5
valor=a*b
print "valor:";valor
a=100
valor=a*b
print "valor:";valor
valor=10000
print "valor:";valor
print
valor=a*b
print "valor:";valor
print
dw1=10
dw2=5
valor=dw1*dw2
print "valor:";valor
dw1=100
valor=dw1*dw2
print "valor:";valor
the output in screen is:
valor:50
valor:244
valor:10000
valor:244
valor:50
valor:500
This is a bug?
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| Radastan mode in ZX Basic |
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Posted by: symbolshift - 2016-10-17, 11:29 AM - Forum: How-To & Tutorials
- Replies (7)
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Hi everyone !
I'm new to this forum. Been using Boriel's Basic for about a year and now that I own a ZXUNO would like to use the Radastan Mode for making simple games.
I've read an old topic with a Plot routine. Are there more I could use? I know there is a kit in C by Radastan himself, but I'd be happy if I could continue programming with ZX Basic.
Thanks in advance and THANK YOU Boriel for bringing me back the joy of writing programs for my beloved ZX Spectrum.
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| Passing strings to assembler |
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Posted by: Uto - 2016-10-09, 12:28 PM - Forum: Help & Support
- Replies (1)
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Hi,
I have this code:
Code: .....
PRINT "Please enter text:"
LET a$= INPUT(8)
SAVEFILE(a$)
.....
SUB fastcall SAVEFILE(name as String)
ASM
.....
END ASM
END SUB
I need to get the string value in the ASM function, and I was expecting having a pointer to it as the second value in stack (so POP HL, POP DE, PUSH HL will keep the return adress in stack and DE as pointer to the string), but it doesn't seem to work like that, How could I get the string parameter from assembler?
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| Using ZX Basic to create ESXDOS dot commands |
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Posted by: Uto - 2016-07-16, 01:18 PM - Forum: Help & Support
- Replies (5)
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Hello all,
I'm new to ZXBasic, but despite of that I've managed to properly build and application using it (<!-- m --><a class="postlink" href="https://github.com/Utodev/ZXCU">https://github.com/Utodev/ZXCU</a><!-- m -->). I've found ZXBasic and its extension a great help to build that application, so first of all, thank you for building this tool.
The application is a menu driven setup application for Zx-Uno spectrum clone, built for latest core avaliable so far. While providing this application as .tap file may be OK, I wanted to try to compile it so it is a ESXDOS dot command, that may be invoked just by .zxuc.
I have built small ESXDOS dot commands before (just proofs of concept), made in assembler, and all that I know, considering they are undocummented, is:
- They are raw machine code binary files, that is, if first instruction is RET the dot command does nothing but returning to prompt. There is no header.
- They start at 0x4000 (ORG 8192)
- They apparently have 8K maximum size (largest one included with ESXDOS, .snaload, takes almost thos 8K)
I have compiled my code using -S 8192 option, but when y run .zxuc ZXUno freezes. I have also tried to compile a very simple code, and do the same, and in that case it doesn't freeze, but it does nothing.
Compiling that code into a .hello command just returns with OK, without printing "Hello World"
I have decompiled what ZXBasic compiles and first instructions are what is expected, but it's way too complicated to debug furthermore.
I have also tried to reduce heap size with -H parameter, but nothing changes.
Any idea what may be wrong?
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| Exit code -1 cause found (SGN) |
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Posted by: LCD - 2016-07-13, 05:55 PM - Forum: Bug Reports
- Replies (2)
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If I have a unsigned variable (e.g. UBYTE) and want a SGN of it, the compiler produces a warning that it can then be only 0 or 1, but the compiler exits with exit code -1. Should be the warning not mean, it can be compiled anyway?
I'm using version 1.4.0s1968.
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