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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…
... , as that points to the system variables area. SP is also important ... -
BASin Release 9a availableJust a quick not to say that an updated (ie, bug fixed) BASin is available. A list of what's new for release 9: Fixed a bug in the line tokeniser th…
... etc.
Then, in the system variables, the 30 bytes at MEMBOT ... -
POKE, PEEK and RANDOMIZE USRAnyone got a store of useful POKES, or RANDOMIZE USR statements with interesting effects? As a start, try anything from RANDOMIZE USR 1216 to RANDOM…
... 25 of the Spectrum manual ( system variables):
[url="http://www ... -
TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …
... /> Tricky. The counters in the system variables are simply incremented every time ... -
Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…
Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…
Indeed - but frankly you only need to care about the system variables if you're using BASIC - otherwise you can fuck them up as much as you like.Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…
... need to care about the system variables if you're using BASIC ... interrupt mode 1? Otherwise, various system variables are still updated - the last ...Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…
Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …
... to avoid flicker. On a 128K system you could use a page ...Program sizeI am typing a basic program into a ZX and I need to find out exactly how much memory it is using. Is there a way to calculate this? :confused:
... prints the difference of the system variables PROG and VARS, pointing to ... the ZX BASIC manual, the variables follow the program immediately, this ...Character SetAlright, this may not be the right forum for this question (it does sort of relate to a game which I'm trying to get working properly - long story) -…
The system variable is CHARS with low ... original Spectrum manual contains these System Variables and is available in the ...RGB values for Spectrum colorsDoes anybody know the true rgb color values for the spectrums 15 colors. I'll assume that black is 0,0,0 White is probably 255,255,255 But what are t…
... to peek the date from system variables.
[url="http://home ...Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…
... the RAM and add some system variables, so I guess you could ...RZX for Sabre WulfI was just about to send an RZX for Sabre Wulf to the RZX Archive when I noticed they don't accept Ultimate's (and other companies' who haven't given…
... that simply one of the system variables (if a machine code game ...How to transfer Tapes to Microcartridges??Hello All, I have a ton of Microcartridges, also about 10 totally unused, was wondering how I can transfer any games I have on tape to Microcartridg…
... spare memory for the extra System Variables let alone a 512 byte ...Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... modes and fool with the system variables. Here's an alternative that ...Is the IY register used by the spectrum rom?Hi I've been writing a sprite routine and have noticed that the sprite data gets corrupted at some points. I have no idea why and can only guess tha…
The IY register points at the system variables usually. If you point it anywhere else, various bytes will be corrupted by the ISR as it alters some of the sytem variables (FRAMES for example)MemoryI am writing a game for the Spectrum and need to store a lot of map data. What is the lowest address I can start to store the data at ?
In theory: anywhere in RAM.
Realistically: just above the screen (assuming you don't need the system variables).MemoryI am writing a game for the Spectrum and need to store a lot of map data. What is the lowest address I can start to store the data at ?
... but was aware of the system variables around there. I wont be ...MemoryI am writing a game for the Spectrum and need to store a lot of map data. What is the lowest address I can start to store the data at ?
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You can overwrite the system variables as long as you're ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... of BASIC has enough extra system variables and wotnot that kio's ...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... include all I can find: system variables, pokes, addresses of ROM routines ...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... all I can
`find: system variables, pokes, addresses of
`ROM ...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... 've added info about the system variables, a couple of addresses in ...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... ) with 0 (see the system variables section below).
This system variable contains various flags controlling ... the Basic system and generally should ... respectively. POKEing this system variable will affect the ...Z88DK + SPLIB2 question.I downloaded the compiler, installed it following the instructions (found at the SPLIB2 website), updated it using the fixed files (stdlib.h and the …
... as suggested, that creates/modifies system variables. Now I move to C ...Disable BREAK 128 basicDoes anyone know how to prevent BREAK in 128k basic?
... acheve something by altering the system variables ERR_SP or ERR_NR (I think ...udg collision detectionhow do I detect a collision between udgs in basic?
... - have a look at the System Variables CHARS entry for more details ...
