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How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... equ 15
ink equ 16 ; ink , x (0-7,8 ... 0xFF
ret z
rst 16
; inc b ; count ... ,0,16,flash,1,"Screen#1at0,16"
defm at,1,16,inverse ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... equ 15
ink equ 16 ; ink , x (0- ... 0xFF
ret z
rst 16
; inc b ... ,16,flash,1,"Screen#1at0,16"
defm at,1,16, ... ,1,flash,1,"Screen#1at1,16"
defb 255
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... equ 15
ink equ 16 ; ink , x (0- ... 0xFF
ret z
rst 16
; inc b ... ,16,flash,1,"Screen#1at0,16"
defm at,1,16, ... ,1,flash,1,"Screen#1at1,16"
defb 255
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... equ 15
ink equ 16 ; ink , x (0- ... 0xFF
ret z
rst 16
; inc b ... ,16,flash,1,"Screen#1at0,16"
defm at,1,16, ... ,1,flash,1,"Screen#1at1,16"
defb 255
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... rst 16
ld a,(mtslY)
rst 16
ld a,(mtslX)
rst 16 ... the character tiles
;rst 16 original code of placing the ... the empty space
;rst 16 original code of placing the ... br /> ld (ix+3), 16
call sprite8x8a
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... /> rst 16
ld a,(mtslY)
rst 16
ld a,(mtslX)
rst 16 ... ;places the character tiles
;rst 16 original code of placing the ... ;places the empty space
;rst 16 original code of placing the ...8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…
... either as 8-bit or 16-bit, with conversions where required ... can obviously be left as 16-bit, but what about the ... -bit operations be performed than 16-bit? Any suggestions?Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…
... the length as the decimal "registers" are only 4-digits long ... />
100 INPUT "Enter two 16-digit numbers"'
"in two ... /> V;TAB 8;X;TAB 16;B;TAB 24;C'
S;TAB 8;W;TAB 16;D;TAB 24;E
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…
... this is a single-byte RST instruction that performs a ... the Z80 will execute a 'RST 0x38' which is a ... 'I' register to form a 16-bit address (the 'I' ... 8-bits of the resulting 16-bit address). The two ... sure that you save all registers you plan to use and ...Calling ROM routinesFirstly, sorry if this is the wrong forum to post this in, but I wasn?t quite sure under which heading is best fitted. I?m trying to figure out how…
... expected numbers - 1, 4, 9, 16, 25, 36, 49, 64, 81 ... just stack values directly from registers. Something like
LD ... /> CALL $2D28 ; STACK-A
RST 28H ; enter calculator
DEFB ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... 16bits
BLOCK: A single 16*16 pixel bitmap.
... DISREG 0x001F7700 ~ 0x001F77FF 0x00000100 Display registers.
RSTTAB 0x001F7800 ~ 0x001F7FFF ...
00 RST SPR PF0 PF1 PF2
01 RST PF0 SPR PF1 PF2 < ...Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…
... the bare machine) the 16-bit number whose high ... forms an address. The 16-bit number read from ... for example, issuing a RST 38h for IM 1 interrupts ... Does the interrupt push the registers and the program counter on ... no pushing and popping of registers + PC on the ...Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …
RST $10 uses EXX to reference the alternate 16-bit registers so there's ...Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …
... 665943]RST $10 uses EXX to reference the alternate 16-bit registers ... $1601 clobbers some of the registers - including DE. So the ... end of control codes
rst $10 ; otherwise print control ... ; load character into A
rst $10 ; print it
...SPIN AssemberHi, I'm in the early stages of learning assembler, and am now looking at some tutorials from Toni Baker in ZX Computing: [url]http://wos.meulie.net…
... LOOP:
ld A,"*"
rst $10
jr LOOP[/QUOTE ... you can't handle 16 bit numbers like that I ... use the registers.
So for a 16 bit number ... bit number. Using the 16 bit version would also put ... upper or lower screen before RST 10h I've always ...ZX PC InterfaceZX <-> PC Interface Contents 1) The ZX <-> PC Interface 1.1) What is it? 1.2) What does it do? 2) Installation 2.1) The softwa…
... saving to tape.
RST 8 is also changed, but ... .
You now can make RST 8 to call to your ... :
1 OUT 1,16 : OUT 1,0 : IF IN ...Reading AY registersCan anyone with a real machine confirm or deny the statements referenced in this [url="http://sourceforge.net/tracker/index.php?func=detail&aid=91120…
... the AY-3-8912's registers (and/or for the YM2149 ...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 processor simply executes an RST 38 instruction if an interrupt ... is then treated as a 16 bit word (LSB of course ... (0xff), coincidentally the opcode for RST 38, so the Z80 will ... executed; if there is a RST n on the data bus ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... Start
MainLoop:
; Store Registers, as we dont know where ... /> ; E.g. Start at 20,16 moving left and up,increasing ... ,0,1,1
DEFB 16,12,0,0,SPRRIGHT,SPRDOWN ... ,192, 96, 32, 32, 16, 16
DEFB 16, 16, 32, 32, 32, 64 ...Speccy games with better graphics than 16 bit versionsRecently been checking out the Atari ST, and was pretty shocked at a few games that have attrocious graphics compared to the spectrum versions... I`…
... speccy wins out over the 16 bits (or even arcade version ...16/48 magazines "The long way home" adventure"The Long way home" text advenure came with the 16/48 tape magazine. It came in quite a few installments. Trouble is, each installment after the firs…
... " text advenure came with the 16/48 tape magazine. It came ...Commodore 16 (yuk!) help neededJust got hold of a whole bunch of retro computers. Slowly working through them, fixing, canibalising, dumping etc. does anyone know what power suppl…
... what power supply the commodore 16 uses - it is not a ...Programming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…
... programming course.
2 16-bit values stored in #8000 ... sum doesn't fit in 16 bit then the value zero ... .
Rules:
* No 16 bit addition registers allowed, only 8 bit ...16/48I seem to recall a rather nifty animation that (I think) appeared on one of those 16/48 tapes - it was a man playing space invaders and his expressio…
... ) appeared on one of those 16/48 tapes - it was a ...Spectrum games which are better than 16-bit versionsLet's talk about games which are better on the Speccy than on 16-bit machines. In my opinion Spectrum versions of "Chase HQ" and "Space Gun" are bet…
Let's talk about games which are better on the Speccy than on 16-bit machines.
In my opinion Spectrum versions of "Chase HQ" and "Space Gun" are better than Amiga versions.Restore Registers Returning to BASICI should really know this, but I've not written code that requires a return to BASIC for a loooong time. What registers need to be preserved / resto…
... loooong time.
What registers need to be preserved / restored ... to restore:
[LIST]
[*]Registers (which ones)?
[*]I register ...
