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FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... found (the ROM scans the BASIC code searching for a matching ... to open a space in memory and LDIR the present parameters stored ... hidden place. After the second LDIR, call RECLAIM-SPACE to free ... /> [B]Systems affected:[/B] ROM BASIC in ZX Spectrum 48K / 128K ... -
a poke to change fonts??hi ppl, there wasnt some poke in basic to change the look alike of the fonts of speccy?? I guess I did things like that in eighties.. also, there…
... know nothing about addresses and memory.. basic instructions likes peek and poke ... -
Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
... whole screen in memory and ldir the whole screen memory - all you have ... graphics behind the sprite in memory)
Create a special offscreen ... -
Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…
USR 0 erase 48kB memory(basic) and set 48 rom with ... enable 128kB memory paging. For switch from 128 basic to 48 basic you ... this command will disable 128kB memory and will available only 48kB ... switch to 48 basic without reset and 128kB memory is available):
Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…
... BASIC, it goes into 48k mode but with all the 128k memory ... ;325108]USR 0 erase 48kB memory(basic) and set 48 rom with ... enable 128kB memory paging. For switch from 128 basic to 48 basic you ... switch to 48 basic without reset and 128kB memory is available):
Copying data between memory banks in USR0 modeI am experimenting with Funky Fungus to load the majority of its data (levels, screens, music etc.) into memory banks 1, 3, 4, 6 and (partly) 7 by sw…
... USR0 mode by selecting 128 BASIC from the menu and then ... use. If you're using BASIC or the standard display code ... don't want to overwrite BASIC
LDIR[/code]
If ...Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…
... you would also specify which memory bank the code blocks should ... suitable location in un-contended memory.
It's important to ... current source code from memory
BASIC - return to BASIC
Memory and BasicQuestions 1. How much memory is available for Basic Progs? 2. How do I check how much is left? 3. How much memory does an array take up?
Questions
1. How much memory is available for Basic Progs?
2. How do I check how much is left?
3. How much memory does an array take up?Jumping to BASIC after importing 23296,1703Sorry for the confusing title. :-D Now that I've learned how to stop a game from starting after loading (in Fuse and Specemu), I have a few more que…
... to safely "jump" to my BASIC program. :)
I ... same as returning to BASIC after an USR command ... basic understanding of m.c. I know how to use LD, LDIR ... import it to the screen memory or even store it ... I'm using the old BASIC editor.
" ...Copying a SCREEN$ in ZX BASIC in 1 second?!Following on from the revived "[thread=20207]Saving a complete SCREEN$ in BASIC[/thread]" thread (although Arjun really only needed a suitable POKE i…
... ]Saving a complete SCREEN$ in BASIC[/thread]" thread (although Arjun really ... $ (or any segment of memory) in ZX BASIC without resorting to a ... an LDIR in machine code, but using only standard ZX Spectrum BASIC ...[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... relying on ROM calls or LDIR) as a learning exercise. ... this code is faster than LDIR because that is operating ... 3503
; Clear attributes memory.
ld a,FLASH_OFF | BRIGHT_ON ... infinity ; Avoid going back to basic. Screen is cleared now, ...Basic listings memory occupationI remember readong someplace that due to basic's representation of number, in a program, in order to save space, it was better to represent integers …
... readong someplace that due to basic's representation of number, in ...How do I avoid BASIC becoming corrupted on returning from a M/C routine?I'm having trouble with my BASIC program becoming corrupted on returning from a m/c routine which sets all the registers (including the shadow regist…
... 'm having trouble with my BASIC program becoming corrupted on returning ... or memory locations when calling a m/c routine from BASIC, and ...IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…
... it's probably much more memory space efficient to place the ... 56 ;for smooth return to Basic
;prepares interrupt ...
ld (hl),229
ldir
ld hl,58853 ...what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…
... from port 7FFD for extra memory pging:
- for ... those bits for extra memory switching and if it ... (not to mention the Basic command SPECTRUM on +128 ... keep track of a memory bank number, by combining ... established port for extra memory, other than the Pentagon ...Saving BASIC code as CODE... can't start programHi guys! I'm trying to create an adventure game for the Speccy in BASIC, called The Legend Of The Red Dragon. I'm using the excellent BASin to code…
... game for the Speccy in BASIC, called The Legend Of The ... , I get an 'Out of memory' message, and cannot get the ...Compiling BASIC programs using Hi-Soft CompilerThis might get me nowhere, but it's worth a try... I'm writing a game in Spectrum BASIC - hopefully, for Simon's CD compilation, if he'll have it - …
... writing a game in Spectrum BASIC - hopefully, for Simon's ... Spectaculator/SPIN running Hi-Soft BASIC compiler. I've been testing ... until the size of the BASIC program crept above 14K ... program whilst BASIC program and compiler were still resident in memory. So ...128K memory testingDuring a mad half hour I decided to write a little memory tester program in BASIC using the information from the 48K service manual. Now I was wonder…
... to write a little memory tester program in BASIC using the information ...Spectrum Basic InterpreterHello. I started this days a strange project: an interpreter of the Spectrum Basic that can run in a Spectrum. Here is a very preliminar version: […
... : an interpreter of the Spectrum Basic that can run in a ... in RAM. It costs some memory, but that way it can ...Printing UDGs in BASICAfter looking a little through Winer Milly's code, it struck me that I might be able to speed up my Cybernoid editor by replacing: FOR a=0 TO 31: PR…
... mode? I am coding the BASIC program in a Text Editor ... (TextMate with a Sinclar Basic plugin).
EDIT:
memory location in a UDG type ... it points to the relevant memory location. I then PRINT CHR ...Total amount of memory on a Speccy ?I wonder............ The C64 (excuse me for saying that name in here. I'll hereby name it just "it") has 64k, while only 38k, or so, is available f…
... makes me wonder: How much memory does a Speccy have, included ... the memory used by the machine itself (for BASIC and such ...How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
... the display is mapped in memory), which can
clear the ... , is no quicker then the basic FOR F=0 TO 19 ... E,1 30 1
LDIR 237 176
RET 201 ... br /> pixels are stored in memory) then that would be
spectrum basic documentationhi. once, i programmed in spectrum basic, yet, i forgot almost everything already. is there a downloadable text which would help me to refresh my the…
hi.
once, i programmed in spectrum basic, yet, i forgot almost everything already. is there a downloadable text which would help me to refresh my the syntax in my memory?
TIAHow could you hear if loading BASIC or MC?When loading a Spectrum program from tape you could usually hear from the sound if it is a BASIC or is some machine code program *. My question is, w…
... if it is a BASIC or is some machine ... differens?
In BASIC I assume that the keyword ... PRINT) was represented in memory by some kind of ascii ... so should not a Basic program in memory (and to tape) ... hard and tight, and BASIC more light and open. ...Memory paging in 128 KB - 64KB RAM possible?I have found a quote in Spectrum 3 manual (available at WOS) -------------------- In the +3, we have crammed in more than twice the amount of memory…
... br /> twice the amount of memory than can comfortably fit. While ... br /> paging - BASIC (and the processor) always 'sees' the memory as 16K ... program to "disconnect" the ROM memory completely and to write to ... the lowest 16 KB of memory with proper paging?
...Looking for an extended BASIC graphics routine from mid- to late-80sHello all, This is my first post here so please go easy. This is basically a cut-and-paste job from comp.sys.sinclair where I've had no luck with an…
... have a more extended collective memory, so here goes.
BASIC program that makes use of ... ' commands from a typed-in BASIC extender program. Alas the machine ... one I'm after. Most BASIC command additions used * or . before ...Alternative ROM on original DivIDEOriginal DivIDE interface contain too allram mode (16kB paging). [url]http://raww.org/index.php?name=News&file=article&sid=2471[/url] Switch to ALLR…
... port 227
16kB memory paging in allram mode:
LDIR ;rom instalation (from 49152 to DivIDE memory)
LD ...
DivIDE SE BASIC instalator:
[url]http://velesoft ...Machine code and Basic system variablesSpectrum system variables (I mean 48KB model) are essential for Basic. But what if I started my machine code program and it's never going to return t…
... 48KB model) are essential for Basic. But what if I started ... never going to return to Basic? Can I overwrite system variables ... command, can I use this memory safely?
And what ... , can I still use this memory?Utility to read/write to memory cards formatted for +3EThis post comes from [url=http://www.worldofspectrum.org/forums/showthread.php?t=25658]this thread[/url]. I've released a small command-line utility…
... partition. It does not modify BASIC loaders in any way, so ... is responsible for customizing the BASIC loader to properly load the ... GUI for handling +3E formatted memory cards without having to deal ... added upon writting to the memory card /image disk.
- ...
