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Screen address of PRINT position...Hi Folks, The following code uses DF CC system variable to extrac the screen address for a PRINT position. [code]100 CLS 110 PRINT AT 10,16;…
... following code uses DF CC system variable to extrac the screen address ... -
ROM PRINT routine issuesHi all, I am using the ROM print routines a lot in my assembly program and I'm experiencing issues. I am changing the system variable DF CC to po…
... issues. I am changing the system variable DF CC to point to ... print routines are updating other system variables to check what 1 ... -
Memory questionsQuestion 1: PRINT PEEK 23732+256*PEEK 23733 returns 65535 for a 48K Spectrum and 32767 for a 16K Spectrum. PRINT PEEK 16388+256*PEEK 16389 return…
... drive gives a completely different system variable at 16388-16389, and there ... -
Custom Menus on the ZX Spectrum +3Today, my Friends, i have the pleasure of presenting a program i have written which gives a set of custom menus on the +3. The main features of my p…
... (pointed to by the ERR_SP system variable), and how things look when ... -
[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…
... the selected color to the system variable 'BORDCR'.
out (ULA_PORT),a ... the selected attributes to the system variable 'ATTR_P'.
ld bc,$2018 ... -
Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…
... keyboard and updates the FRAMES system variable. Since the interrupt always causes ... -
TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …
As for the Vertical blanks, I just waited for a state change in the timer system variable, that changes every 1th of a sec, although its not politically correct.
GBNvK. -
42 column text, Sinclair Print Utilities, etcI'm currently developing the next of the ZXIF text adventures - "43 Minutes" and, as a side issue, I'm really interested in 42 column text for this g…
... . You can point the CHARS system variable at your own character set ... -
Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??
... was meant to check the system variable NMIADD (#5CB0) and jump to ... -
Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??
... was meant to check the system variable NMIADD (#5CB0) and jump to ... -
VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…
... keyboard and updates the frames system variable -- pure overhead from Basic. It ... halt) was reading the frames system variable to see if an interrupt ... -
MC 101Hello Group Members: Can't spectrum MC be embedded in a BASIC program
... , as pointed to by the system variable PROG, and add three or ... -
MC 101Hello Group Members: Can't spectrum MC be embedded in a BASIC program
... for that by PEEKing the system variable PROG and add on offset ... -
ZX Spectrum 128 Introduction-booklet?Does anyone here have the introduction booklet for the ZX Spectrum 128 for sale? Or does anyne know a place where to look? And I mean the real book, …
... bidding for a whole Speccy 128 system on eBay - I already has ... a boxed speccy 128 minus the intro booklet but ... fully complete my boxed speccy 128 setup. -
An intriguing question...Well, intriguing for me anyway. As we all know, when calling a Machine Code function from BASIC, we use the USR (address) function. But for this to …
[quote]
RANDOMIZE USR do nothing with it.
[/quote]
RANDOMIZE will set the value as seed for random numbers, in the appropiate system variable. -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... the value in the NMIADD system variable (23728) if it was non ... -
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 byte ... original Spectrum manual contains these System Variables and is available in ... -
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…
... started in. Restoring register and system variable values might be a first ... -
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…
... wrote:
Restoring register and system variable values might be a first ... -
loading techniques I never worked outFirstly, how do games that load with LOAD "" CODE autorun? Secondly, how do you save a basic program as a CODE file (but not as BASIC compiled into …
... the memory from the first System Variable up to E_LINE (which comes ... -
Pixel LimitIF Y3<192 THEN : LET x2=INT (128+X*A*SIN A): LET y2=INT (Y3): DRAW INK
... screen by POKEing to a system variable (I forget which..)
Setting the borderCan someone tell me best way to set the border to a given colour using machine code. Its there an operating system call or can I load up a memory loc…
... colour and set the BORDCR system variable (23624) accordingly.
Port ...Speed of blinking L on a Speccy???Friend of mine and I have had a "discussion" (close to a game of fisticuffs) about how fast it takes to invert the attribute for the blinking L (or t…
... flashing colors. Like, via a system variable... It would certainly have been ...Speed of blinking L on a Speccy???Friend of mine and I have had a "discussion" (close to a game of fisticuffs) about how fast it takes to invert the attribute for the blinking L (or t…
... flashing colors. Like, via a system variable... It would certainly have been ...Speed of blinking L on a Speccy???Friend of mine and I have had a "discussion" (close to a game of fisticuffs) about how fast it takes to invert the attribute for the blinking L (or t…
... flashing colors. Like, via a system variable... It would certainly have been ...Famous fans of SpeccyI was wondering if you, european people, can tell me about european personalities - think in artists, politicians, bussinessmen -, that love the Spec…
Aha, just remembered another - Terry Pratchett. Anyone who names a mountain range after a Spectrum system variable must be a bit of a fan.Famous fans of SpeccyI was wondering if you, european people, can tell me about european personalities - think in artists, politicians, bussinessmen -, that love the Spec…
... about it. Was Ramtop a system variable on the ZX81 too?
