-
The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... .
Even has an Off Screen Buffer viewer.
One very nice ... -
The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... STACK-BC ROM routine
push hl ; push ret address
push bc ; push ...
push hl ; push ret address
push bc ; push RANDOMIZE USR ... -
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,…
This is just an example of what the stack can do.
It is just swapping values around.
[code]
LD HL,16384
LD DE,22528
LD BC,49152
PUSH HL ; put 16384 onto the stack
; stack 16384 -
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,…
... & C, you might do PUSH BC before your call then POP ... sub-routine you do PUSH AF, PUSH BC and PUSH HL. Then at the ... end you do POP HL, POP BC ... thing is you can't PUSH single 8-bit registers on ... 16-bit register pairs like BC, DE and HL. So ... -
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…
... registers
PUSH BC
PUSH DE
PUSH HL
PUSH IX
... EXX
EX AF,AF'
PUSH AF
PUSH BC ...
PUSH DE
PUSH HL
PUSH IY
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…
... /> org 65368
exx
push hl ;save H'L'
push de
pop ix ;IX ... of w$
PLOTs: push hl
ld c,(ix ... br /> inc ix
DRAWs: push bc
ld a,(ix+0 ... DE=end of w$
push ix
pop hl ;HL ...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…
... ,(0x5b5c)
ld bc,0x7ffd
push af
push bc
res 4 ...
call 0x13f
pop bc
pop af
di ...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 stack
33004 CALL GO ;push 33007 onto ...
GO:
33008 POP BC ;pop 33007 from stack to ...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 …
... you load BC with 16384:
1. PUSH BC. This instruction ... places the value in BC (16384) on ... :
3. POP BC. This instruction takes the value ... is 33007), copies it into BC and [i]increments[/i] ...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…
...
ld hl,#053f
push hl
ld hl ... /> jr l05c2
l05b3: push bc
rl c
xor ...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…
... just one.
A PUSH/POP pair takes 21 cycles ... things like "pop af; pop bc; push bc; push af" to get hold of ... 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 …
... br /> pop de
pop bc
pop af
... push bc
push de
push hl
exx
push af
push bc
push ... de
push hl ...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…
[code]push af
push bc
call charaddress
pop bc
pop af ... [/code]
It is better to push ...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…
... 2 bytes, whereas [b]push bc:push de:push hl:pop hl:pop de ... :pop bc[/b] takes 66 Ts ...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…
[quote="Bedazzle;915425"][code]push af
push bc
call charaddress
pop ... bc
pop af[/code ... ]
It is better to push ...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…
... "][quote="Bedazzle;915425"][code]push af
push bc
call charaddress ...
pop bc
pop af ... [/code]
It is better to push ... function that does the push/pop of registers that ...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…
... 2 bytes, whereas [b]push bc:push de:push hl:pop hl:pop de ... :pop bc[/b] takes 66 Ts ...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…
... "][quote="Bedazzle;915425"][code]push af
push bc
call charaddress ...
pop bc
pop af ... [/code]
It is better to push ... function that does the push/pop of registers that ...
