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Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…
...
LD HL, 13453
POP BC
RET
[/code]
POP it, those bytes get read ... -
Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…
... might do PUSH BC before your call then POP BC afterwards to set ... going to mess with A, BC and HL then at the ... at the end you do POP HL, POP BC, POP AF to set things ... 16-bit register pairs like BC, DE and HL. So A ... -
Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…
... all registers
PUSH BC
PUSH DE
POP HL
POP DE
POP BC
POP AF
EXX
EX AF,AF'
POP ... IX
POP HL
POP DE
POP BC
POP ... -
WoS Birthday ChatWe have an IRC channel set up on coldfront - #wos The official chat will be on Friday at 7pm GMT. Feel free to pop in tonight for the birthday or…
... ; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop bc; pop… -
Akalabeth gamei found now that someone ported an ansi-basic game (coded in 1979?) to msx-basic - what about a zx-spectrum basic version of it? ;) https://plus.goo…
... /> push de
pop ix ;IX=start of w ... call $24b7 ;DRAW_LINE
pop bc
inc ix
inc ... /> djnz DRAWs
pop de ;DE=end of w ... /> push ix
pop hl ;HL=position in w ... /> jr nz,PLOTs
pop hl
exx ;restore ... -
c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... BASIC' flag (free printer buffer)
ld bc,$7ffd
ld a ... -
c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... /> ld a,(0x5b5c)
ld bc,0x7ffd
push af
push bc
res 4,a
call 0x13f
pop bc
pop af
di
ld ... -
c compiler benchmarkingI am going to have access to a number of commercial z80 compilers for a time for benchmarking, namely Hitech C v750 MSDOS (abandoned when Hitech was …
... most valuable optimisations. Sprite manipulation, screen buffers, collision detection? I'm ... />
[quote]
Sprite manipulation, screen buffers, collision detection?
[/quote ... . But again, it manages the screen buffer and draws it. The user ... -
More basic assembly stuff!I've been figuring out some more stuff using CALL and DEFB but this has me a bit stumped. [code] ORG 33000 LD BC, 16384 PUSH BC CALL GO RET …
...
33000 LD BC, 16384
33003 PUSH BC ;push 16384 onto ... /> 33008 POP BC ;pop 33007 from stack to BC
33009 RET ;pop 16384 from ... -
More basic assembly stuff!I've been figuring out some more stuff using CALL and DEFB but this has me a bit stumped. [code] ORG 33000 LD BC, 16384 PUSH BC CALL GO RET …
... your program after you load BC with 16384:
1 ... . PUSH BC. This instruction places the value ... in BC (16384) on the top of ... , which is:
3. POP BC. This instruction takes the value ... -
Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... 13
ld bc,+(tpulse1 shl 8) ... />
l05b3: push bc
rl c
... /> ld a,c
pop bc
ret nz
... -
z80 Helper?When you are programming with z80 do you get 'lost' you are in the middle of making a routine and you can't remember which registers are holding val…
... one.
A PUSH/POP pair takes 21 cycles and ... code can most often just pop as it needs the stored ... involves doing things like "pop af; pop bc; push bc; push af" to get ... on the stack (now in BC) or "ld hl,n; add ... -
Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
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 …
... header i.e. discard to screen buffer
LD DE,17 ; Length ... /> LD IX,screenfile ; Load screen bytes to screen buffer
LD DE,$1B00 ...off screen bufferwhen using an offscreen buffer is the memory copied to the screen in a way that makes it easier to draw sprites to the buffer? E.g. Lets say you…
... , the format of an off-screen buffer is [i]almost [/i]always ... same odd format as the screen a couple of times, but ...Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …
... extra code into the second screen buffer for menus and level loading ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
Well you've no registers left to use so you either (a) Push AF and PUSH BC and then POP BC and POP AF either side of CALLcharaddress or (b) completely re-write the routine.what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
...
push bc
call charaddress
pop bc
pop af[/code]
It is better to push/pop ...Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …
... the CPC I had both screen buffers in memory at all ... can only use a hardware screen buffer using bank 7, and only ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... [b]push bc:push de:push hl:pop hl:pop de:pop bc[/b] takes ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
...
push bc
call charaddress
pop bc
pop af[/code]
It is better to push/pop ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
...
push bc
call charaddress
pop bc
pop af[/code]
It is better to push/pop ... function that does the push/pop of registers that matter when ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... [b]push bc:push de:push hl:pop hl:pop de:pop bc[/b] takes ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
...
push bc
call charaddress
pop bc
pop af[/code]
It is better to push/pop ... function that does the push/pop of registers that matter when ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... to reason about what PUSH/POP combinations are actually required if ... is wrapped in a PUSH/POP BC, it might be worth moving ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... to reason about what PUSH/POP combinations are actually required if ... is wrapped in a PUSH/POP BC, it might be worth moving ...What is the maximum fps the spectrum can achieve?I have been doing some reading and from what I understand the Spectrum outputs a PAL signal, but that means it will display @50fps or @25fps? If t…
... that concept of an off-screen buffer being generated and swapped, so ... only a single sprite per screen frame. That would mean ... games will hardware scroll the screen and move sprites with the ... as simple. Game logic and screen updates are inextricably linked and ...Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... /> POP SP
POP IY
POP IX
POP HL
POP DE
POP BC ...
POP AF ... ,AF'
POP HL
POP DE
POP BC
POP AF
JP ...Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... hl,$4000 ;start of screen file
ld bc,$18 ;0 into ... B; 8 pixel rows x 3 screen thirds ... ld (hl),a ;pattern into screen address
inc hl ;next ... screen address
djnz loop ;repeat ...
