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I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... " betwwen two or more ZX Basic programs ?
... change), and swap the system variables area on context switch, and ... loop, etc...
Basic allows to limit memory usage ... be able to run 2 basic applications simultaneously.
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RANDOMIZE USR, PRINT USR etcHello just wondering why is it called RANDOMIZE UsR what does randomising have to do with it ? When calling machine code routine from adress x you ty…
... , taking some space from the variables area. If you have put CLEAR ... runing some unintended line of BASIC.
- RANDOMIZE will put it ... have some effects if your BASIC uses RND after that USR ... won't be returning to Basic (like most games), any option ... -
how to load machine codeI'm reading Jon Caldwell's how to write Spectrum games but can't enter the code! Here's an example:_ LD BC, (score) Call 6683 I tried putting…
... - this contains the interpreter for BASIC, all the LOAD / SAVE functions ... things. This is the 'SYSTEM VARIABLES' area. It also sets up the ... the system variables are stored, then the storage of your BASIC program ... -
how to load machine codeI'm reading Jon Caldwell's how to write Spectrum games but can't enter the code! Here's an example:_ LD BC, (score) Call 6683 I tried putting…
... - this contains the interpreter for BASIC, all the LOAD / SAVE functions ... things. This is the 'SYSTEM VARIABLES' area. It also sets up the ... the system variables are stored, then the storage of your BASIC program ... -
Communal Project for ASM NewbiesHi Folks, I tend to learn best by trying stuff and then going through the pain of it not working so that I can research and fix mistakes. I suspec…
... it pokes into the system variables area of memory so you can ... 't use that area for your own things. ... index into the system vars area to do its poking. ... if you're using the basic rom to do a lot ... to leave the system variables area and IY alone anyway. -
Help with loading problems.I have a few games that have either started or have always had a problem loading. The main problem seems to be that they start to load ( the sound is…
... /> Instead of having a separate BASIC loader and machine code block ... of RAM, including the system variables area set to point to the ... leave any memory free for BASIC (especially useful when writing for ... -
z88dk : Support FunctionsJust a quick one here, I am looking to doing some dirty dirty code with C and load a screen$ file from the disk using "system( command )" - yes I …
... functions that interact with basic as described under the ... library:zxspectrum"]Interfacing to zx basic[/url]". I have no ... specific basic line number and give the ability to set variables ... sure you stay above basic's program and system variables area. -
Brain 8I am glad to present my new "experiment" in Sinclair Spectrum 48K BASIC. https://drive.google.com/file/d/17_wCFWaAl5diIVt3rPLTbKhxDmPmYmOs/view?us…
... use the typically ZX81 BASIC definitions of integers e ... using POKE/PEEK for variables for improved speed?[/ ... at the end of variables stockpile, resulting much ... (still) POKEd the variables area or VARS system variable.< ... to discuss about our BASIC programming! -
Brain 8I am glad to present my new "experiment" in Sinclair Spectrum 48K BASIC. https://drive.google.com/file/d/17_wCFWaAl5diIVt3rPLTbKhxDmPmYmOs/view?us…
... of i$ into the variables area. I am changing it ... every single byte counts in BASIC, for memory. In ... where unfortunately) that Sinclair BASIC on the Spectrum will ... be avoided in the BASIC list. That is why ... ) I put the frequent variables first, then loading the ... -
'Vulcan' and 'Desert Rats'Hi people. My e-mail is [email="danielthorlby@hotmail.com"]danielthorlby@hotmail.com[/email] I was wondering if anyone here has ever been really into…
... into the program to change basic variables within these games? -
Which would be fasterSay you want to use a variable value of 0 to 255 in a BASIC program, which way would be fastest? Say for arguments sake you wanted to use two variabl…
... 0 to 255 in a BASIC program, which way would be ... /> 1) Using the standard Spectrum BASIC variables, i.e a and b ... quickest for BASIC maths operations
1) normal variables (for example ... -
A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…
... , after 20 years stuck in BASIC). I read a SU article ... . I still see registers as BASIC variables, and I want to change ... -
ISO ROM 128 with TR-DOS 5.05(cz)This is new correct version of ISO ROM for ZX + BETADISK. Some extra basic command is designed specially for use in conmination with TR-DOS 5.05(cz).…
... ]
new basic syntax:
!! (call ... /> !LOAD "filename" (load basic file "filename")
!GOTO ... registers ...)
= (show basic info - ramtop, used memory, ... RESET - return to basic (if basic variables is bad then use ... -
automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …
... code is held within the BASIC program area and moves as the ... using a POKE list in BASIC (which is what I was ... -
Indirect Variable AssignmentHere's another wacky routine. This allows assignment of values to variables where the source & destination variables can themselves be defined in var…
... allows assignment of values to variables where the source & ... any arbitrary group of variables to be processed as ... statement could themselves be variables, increasing the possibilities for ... own for assigning values to BASIC variables from machine code. Just ... -
CAT!RAM and PUTRAMLast year sometime I posted a couple of routines to: * catalogue the 128k RAMdisk in BASIC; * move RAMTOP and the stacks from BASIC. CAT!RAM and PUTR…
... /> * catalogue the 128k RAMdisk in BASIC;
* move RAMTOP and the ... stacks from BASIC.
CAT!RAM and ... stupid) from within a BASIC program while preserving the m ... stack and GOSUB stack and BASIC variables; it also updates (ERR_SP). ... -
Spectranet firmware update: TAP file loading fixArchie Robins discovered a problem whereby interrups were being erroneously enabled on the return from a tape trap (that is, when TAP files are being…
... -BYTES. This may be the BASIC ROM itself in the case ... code running in the ZX BASIC sysvars area and expects interrupts to ... -
Help with Snake type game...any ideas ?Hi all I've attached me trying to write a snake type game. My first concern is me not writing over the System variables area. I'm pretty happy what i…
... not writing over the System variables area. I'm pretty happy what ... -
Are line numbers considered the first statement in the line?I'm trying to understand how BASIC variables are stored in memory using the BASIC Programming manual and am puzzled by the results of the control var…
... 'm trying to understand how BASIC variables are stored in memory using ... the BASIC Programming manual and am puzzled ... -
New Version of ZEsarUX v9.3 Beta 1 availableNew Version of ZEsarUX v9.3 Beta 1 available Downloads: [url="https://github.com/chernandezba/zesarux/releases/tag/9.3-25062021"]https://github.co…
... wheel
-Can now browse Basic variables on ZX Spectrum, ZX81 and ... -
ZEsarUX 10.0ZEsarUX 10.0 is out! Download it from : https://github.com/chernandezba/zesarux/releases/tag/10.0 Changes: Version 10.0 - Clive Sinclair edi…
...
- Can now browse Basic variables on ZX Spectrum, ZX81 and ... Debugging:
-Can now browse Basic variables on ZX Spectrum, ZX81 and ... show location address of every basic line and current line ... on menu View Basic
-Added Window View ... -
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…
... that points to the system variables area. SP is also important, but ... -
MC 101Hello Group Members: Can't spectrum MC be embedded in a BASIC program
... take the start of the BASIC program area, as pointed to by ... -
QuickBASICQuickBASIC Emulation: Is it possible to declare and pass global variables throughout a program along with confine a local variable to just a module-…
Sinclair BASIC has no concept of local/global variables, unless you're using ... merge any variables in too, into the main "pool" of BASIC variables.
Which would be fasterSay you want to use a variable value of 0 to 255 in a BASIC program, which way would be fastest? Say for arguments sake you wanted to use two variabl…
... /> 1) Using the standard Spectrum BASIC variables, i.e a and b ... to escape memory contention in BASIC. You can't. The ... are slightly slower than using variables, for what it's ... quickest for BASIC maths operations
1) normal variables (for example ...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: […
... already added LET command. So variables are supported now.
Where ... do you store variables in memory map?
[/QUOTE ... variable VARS point to the variables area. The way they are stored ... the same (arrays and variables with more than one letter ...If a C64 can do it...Forgive me if this isn't the right section. We've seen coders surprising us over and over again with excellent demos and things that a few years ago…
... POKE address,data in Basic. All Basic variables, all C variables, all C data ... in some format. Integer variables take up two bytes to ... local and global variables (all vars in Basic are global, ie ... C functions can contain local variables that only exist while ...Speed of variables vs. POKE/PEEKGreetings, I'm sure I could probably find this out after careful study of the 48K ROM disassembly, but I was wondering whether someone already knew …
... Numeric variables keep their position in the variables area so define ... applies to FOR/NEXT variables also. A simple variable ... mostly just using numeric variables (constants, and FOR/ ... slow) reorganisation of memory area containing the variables.
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