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.tap file code not execut...
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Exit from more than one l...
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put small ASM programs li...
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Scope rules
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Using constants not allow...
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Spectrum keywords codes
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| Simple RLE Decompressor |
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Posted by: LCD - 04-29-2011, 11:47 PM - Forum: Wishlist
- Replies (5)
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Maybe not a bad idea: a decompress function for RLE encoded binaries (starting with dbyte contains length of compressed and a flag byte). Maybe something like UnRLE(sourceaddress,destinationaddress) returning the length of decompressed bytes or alternative, if the starting bytes are missing: UnRLE(sourceaddress,destinationaddress,length,flagbyte), or even with bank switching management. This will allow to pack more graphical and level-data into our programs. Maybe a job for britlion, to write a fastcall routine? This can be used for all Z80 computers then.
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| Reading files from disk |
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Posted by: na_th_an - 04-28-2011, 10:14 AM - Forum: How-To & Tutorials
- No Replies
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Maybe this is obvious, but let me ask - is there any way to read a BYTES file from disk (I mean, plan +3 disks) from a program compiled in ZX Basic to RAM? I mean, without having to exit the program and go back to plain BASIC to do so. Maybe through ROM calls? Any info on this would be greatly appreciated. I'd like to design some kind of system to make graphic adventures which load stuff from disk.
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| IF Nesting problem and +D Emulation (*solved*) |
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Posted by: LCD - 04-19-2011, 11:42 PM - Forum: Bug Reports
- Replies (2)
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Code: while (a band 16)=0
h=a band 5
v=a band 10
if oldh=4 then
if h=5 then newx=x+1
elseif h=0 then newx=x-1
end If
else if oldh=5 then
if h=1 then newx=x+1
elseif h=4 then newx=x-1
end If
else if oldh=1 then
if h=0 then newx=x+1
elseif h=5 then newx=x-1
end If
else if oldh=0 then
if h=4 then newx=x+1
elseif h=1 then newx=x-1
end If
end If
wend
Code: while (a band 16)=0
h=a band 5
v=a band 10
if oldh=4 then
if h=5 then newx=x+1
elseif h=0 then newx=x-1
end If
end If
wend
And I also noticed that one of my games crahes the Spectrum if ZX Spin is started with enabled +D emulation. Boriel, could you check all your compiler tests with ZX Spin and enabled +D? The game preview of QFJ I sent to you some time ago: If I try to play, the gems cannot be swaped. Without +D Emulation anything works okay.
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| Paper/Border rerun bug |
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Posted by: Darkstar - 04-12-2011, 10:34 PM - Forum: Bug Reports
- Replies (5)
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Code: 10 BORDER 4
20 CLS
30 PRINT AT 1,9;INK 3;"Hello World from Assi";
40 END
Hi,
The above code gives green paper with a magenta in ink in the text
message when run the second time from the BASIC loader.
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| DIM x as String = ? |
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Posted by: LTee - 04-07-2011, 12:36 PM - Forum: Wishlist
- Replies (3)
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Hi everyone!
Should this work?
Code: DIM x as String = "test"
I get the following error when I try to compile:
Code: Initializer expression is not constant.
Doing this instead is fine:
Code: DIM x as String: x = "test"
I'm using the latest 1.2.8s696, by the way.
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| Japan Tsunami Appeal (open ZX firmware) |
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Posted by: cheveron - 04-04-2011, 08:34 AM - Forum: ZX Basic Compiler
- Replies (8)
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As some of you will be aware, I've been tinkering with an open source version of SE Basic that could be distributed with hardware without infringing Amstrad's copyright. I'm pleased to say the project is now viable, although it is not yet written.
I've also said I would only release it in exchange for a sack of cash. So let me quantify that: I want 100 people to donate a minimum of £10/€10 each to the Red Cross Japan Tsunami Appeal.
You can sign up here:
http://www.pledgebank.com/opense
If you are based in the UK you can make your donation here:
http://www.redcross.org.uk/Donate-Now/Ma...ami-Appeal
If you are based in Spain you can make your donation here:
http://www.cruzroja.es/portada/
I know it's called pledgebank but I want you to donate now. This is an honour system. If you say you've donated £10/€10 or more I'll assume you have.
Please sign up by July 1st.
Thank you.
-Andrew
P.S. I have donated £10 to get the ball rolling
The total has now reached 17 (13 of which have paid up already). It would be lovely to get to 20 this week. So to encourage you here's a progress report:
* More than 60% of the ROM is now fully functional and unencumbered by Amstrad code.
* The ROM is functionally compatible with SE Basic 2.21 http://www.worldofspectrum.org/infoseeki...id=0025327
* As far as I can tell, everything that ran on the 2.21 ROM still works.
* New RENUM routine. It only accepts the first two parameters, but it isn't broken either.
* New tokenizer. You can now enter INK and it will automatically be translated to PEN.
* 60 abbreviated commands:
Code: A.TTR ED.IT LO.AD RA.NDOMIZE
BE.EP ER.ASE ME.RGE RE.AD
B.IN E.XP M.OVE REN.UM
BO.RDER FL.ASH NE.XT RES.TORE
BR.IGHT F.ORMAT N.OT RET.URN
CH.R$ GOS.UB ON.ERR R.ND
CI.RCLE G.OTO OP.EN# SA.VE
CLE.AR I.NK OV.ER S.CREEN$
CL.OSE# INKE.Y$ PA.PER SO.UND
C.ODE INP.UT PAL.ETTE ST.R$
CON.TINUE INV.ERSE PAU.SE T.AB
DA.TA L.EN PE.EK TH.EN
D.EFFN LI.NE PL.OT U.SR
DEL.ETE LL.IST P.OINT V.AL$
DR.AW LP.RINT PR.INT VE.RIFY
Code: LOAD, CODE, RUN, SIN, COS, TAN, ASN, ACS
Thanks again to everyone who has already contributed.
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| Memory Management |
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Posted by: britlion - 03-31-2011, 09:48 AM - Forum: Wishlist
- Replies (16)
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Why not just put your org lower, have your low non speed critical functions, use align to hop to 32768 and stick a defs 6912, 0 to skip your screen buffer zone?
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| A For-Next bug in 1.2.8-s682 |
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Posted by: Darkstar - 03-29-2011, 06:24 PM - Forum: Bug Reports
- Replies (13)
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This works:
Code: For i = AttrAddress to AttrAddress + NumberOfCells - 1
Poke i, AttrColor
Next i
This does not:
Code: For AttrAddress = AttrAddress to AttrAddress + NumberOfCells - 1
Poke AttrAddress, AttrColor
Next AttrAddress
This would work in other dialects.
Thanks,
Darkstar
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| A string bug in 1.2.8-s682 (*solved*) |
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Posted by: Darkstar - 03-29-2011, 01:17 AM - Forum: Bug Reports
- Replies (12)
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This does not work:
Code: #Include "alloc.bas"
Declare function String$ (ByVal NumberOfChars as ubyte, ByVal Char as string) as string
Declare sub PlayScrBasic (byval SkyColor as ubyte)
Ink 7: Paper 0: Flash 0: Bright 1: Over 0: Inverse 0: Border 0: Cls
Print "Hello"
Const Black as ubyte = 0
Const Blue as ubyte = 1
Const Red as ubyte = 2
Const Magenta as ubyte = 3
Const Green as ubyte = 4
Const Cyan as ubyte = 5
Const Yellow as ubyte = 6
Const White as ubyte = 7
PlayScrBasic (Cyan)
End
Function String$ (ByVal NumberOfChars as ubyte, ByVal Char as string) as string
'Dim Chars$ as string
'Dim CharPtr as uinteger
'Dim CharsPtr as uinteger
'Dim CharsPtrDeallocate as uinteger
'CharStr
'NumberOfChars = NumberOfChars + 1
'CharsPtr = Allocate(NumberOfChars)
'Dim CharStr as string at @CharP
''CharP = @Char$
'Return "x" '@Char$
Dim i as ubyte
For i = 1 to NumberOfChars
Chars$ = Chars$ + Char$
Next i
Return Chars$
End Function
sub PlayScrBasic (byval SkyColor as ubyte)
Dim i as ubyte
Dim Space32$ as string
Space32$ = String$(32, " ")
cls
Paper SkyColor
If SkyColor <> 0 then
fOR i = 0 TO 12
'Print at i, 0; String$(32, " ")
Print at i, 0; Space32$
Next i
End if
Space32$ = ""
Paper Green
Print at 11, 6; String$(21, " ")
FOR i = 8 TO 21
Paper Red
Print at i, 5; " "
IF i > 11 THEN
Print at i,5; String$(22, " ")
IF i > 12 AND i < 21 THEN
Paper Blue
Print at i, 0; String$(5, " ")
Print at i, 27; String$(5, " ")
End if
End if
Next i
Paper Yellow
Print at 21, 0; String$(5, "Û")
Print at 21, 27; String$(5, "Û")
Paper Black
end sub
However if I rem out everything that has Space32$ in it and unrem:
'Print at i, 0; String$(32, " ")'
Then it works fine and heap size does not seem to matter. If I press break
and restart the program then it fails on the second run even though it
works fine the first time if I make the changes noted above.
My bat file to compile this is as follows:
@echo off
if exist GAME.TAP del GAME.TAP
zxb Invasion.b --optimize=0 --output=GAME --tap --BASIC --autorun --org=39680 --array-base=0 --string-base=0 --heap-size=1280 --strict-bool --enable-break
ren GAME GAME.TAP
I do not trust this string handling and it would be nice to have a inbuildt
String$(NumChars, Char$) function.
Thanks,
Darkstar.
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| Sound effects? |
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Posted by: LTee - 03-25-2011, 08:48 AM - Forum: How-To & Tutorials
- Replies (21)
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Can anyone suggest how I could make some half-reasonable beeper sound effects? My initial experiments with BEEP are.... uninspiring. :-D
I was wondering if there was a tool or something that I could use to create some snazzier effects and then somehow integrate those into my ZXBasic setup? Or are there any tricks that people use to get more out of BEEP?
Thanks!
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