-
HELP!I'm trying to replace a bit in a byte as follows, but having some sort of brain freeze trying to get it to do what I want. A=00 if bit to replace …
... /> ;Using the stack
pop de ;+0: mask, +1: sprite (image)
;Without using the stack
ld a,(de) ;DE ... hl
or (hl) ;+1: sprite
inc hl
ld ... -
New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…
... of instances of a “runaway stack” (CALLS without RETs) have been ... that sometimes affected the base sprite as it moved off the ... -
Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... ' needed.
As the sprite is laid down from the ... quickly invented to use the stack to 'back-up' the background ... . It does mean that the stack has to be restored afterwards ... -
128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... window due to changes in sprite numbers etc, typically take a ... want to keep things like sprite drawing loops or beeper routines ... . Likewise e.g. allocating your stack space in there; an occassional ... -
How does masking work?lets say you have a sprite which is 00111100 so thats the equivalent of 1+2+64+128 the mask would be the opposite? 11000011 so on screen is:…
... one pixel wider than sprite but nothing stops you ... 1) Keep mask data then sprite data
2) Keep ... mask data mixed with sprite (byte of mask, byte ... bytes from stack, one of mask and one of sprite
...
OR D ;put sprite inside
LD (HL ... -
1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
...
org 0fc00h
;sprite data 232 bytes with the ... af ;backup byte result onto stack
next_right:
rrc ... ,0000h ;restore base position of Stack Pointer
... -
Isometric enginesWhilst taking a breather from Chess development I've been playing around with a little isometric 'room' building idea. Just wondering what sort of…
... .
In normal masked sprite terms, each block would usually ... just! Cheeky use of the stack helped to limit that!
How can I make a UDG rotate?I designed a set of UDG's that can be used for making shapes or letters. Trouble is that my circle - for example - consists of 4 pieces and it would…
... ; IX = points to 8x16 pixel sprite + mask
... ; Retrieve de from the stack
POP BC
stack
RET
Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... ) you can forget about multithreading. Stack is fine, though.[/quote]
sprite engine is also capable of ...New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…
... are now smaller
—Copter sprite attributes are now only applied ... the cells occupied by the sprite in each frame
—Code ...
Bug fixes:
—Stack relocation is improved to prevent ...Kempston Mouse DriverHi Folks, Does anyone know the email of Chris Cowley who wrote the Kempston Mouse Driver in the WOS Archive? Many thanks Paddy
... /> ; IX = points to 8x16 pixel sprite + mask
LD BC ... DE ; Retrieve de from the stack
POP BC
... ; Store de safely on the stack
LD A,C ; ... DE ; Retrieve de from the stack
RET
; ...Modern Speccy games with good scrollingOne of the things I like the most on the Spectrum is also one of the hardest to pull off - a good scroll in an arcade type game. Uridium is one of my…
... easier, because it uses the stack and a limited number of ... buffering the area under each sprite—you redraw the entire scene ...Zynaps scrolling - anyone ever reverse enginnered this?Zynaps has IMO some impressive scrolling - it utilises 18 character rows of the display file, so quite a large active play area, and scrolls 2 pixels…
... wasn't part of the sprite rendering routine, but a few ... it showed up in the sprite rendering when I re-started ... at some points using the stack pointer to point to the ...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…
... />
; sprite8x8a
; draw 8x8 sprite aligned to cell
; ix ... think it might be the stack?) Anyway basic copies some stuff ...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…
... player_fracX)
; draw player sprite
ld hl, empty_box
; draw column aligned sprite, arbitrary row
; DOES NOT ...
; draw column aligned sprite, arbitrary row, always using a ... br /> ; save HL on stack
push hl
...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…
... player_fracX)
; draw player sprite
ld hl, empty_box
; draw column aligned sprite, arbitrary row
; DOES NOT ...
; draw column aligned sprite, arbitrary row, always using a ... br /> ; save HL on stack
push hl
...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…
... flickering of the player sprite if the player is ... push hl ;store hl on stack
push hl ;next ... push hl ;store hl on stack
push hl ; ... push hl ;store hl on stack
push hl ; ...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…
...
; draw column aligned sprite, arbitrary row
; DOES ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ...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…
...
; draw column aligned sprite, arbitrary row
; DOES ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ...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…
...
; draw column aligned sprite, arbitrary row
; DOES ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ...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…
... loop counter is pushed on stack in b
pop bc ... exit, could use a masked sprite for the player I suppose ...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…
... loop counter is pushed on stack in b
pop bc ... exit, could use a masked sprite for the player I suppose ...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…
... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ; ... /> djnz .attribloop
.stack
ld sp, 0 ...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…
... either save them on the stack and restore afterwards if you ... correct registers.
The sprite 16x8a and sprite16x8a routines need ...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…
...
; draw column aligned sprite, arbitrary row
; DOES ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ; ... hl ;store hl on stack
push hl ...New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…
... ZX Spectrum Next emulation: added sprite rendering priority bit
Improved ... DataDrive emulation
Fixed crash (stack smashing detected) when showing Debug ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... /> [code]
; draw an 8x8 sprite arbitrary x, y position
; save HL on stack
push hl
REPT ...
; draw column aligned sprite, arbitrary row, always using a ... for off screen drawing, entire sprite must be on screen
New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…
... ZX Spectrum Next emulation: added sprite rendering priority bit
Improved ... DataDrive emulation
Fixed crash (stack smashing detected) when showing Debug ...New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…
... to a value from the stack
-Added a setting to ... ZX Spectrum Next emulation: added sprite rendering priority bit
Improved ... now working
Fixed crash (stack smashing detected) when showing Debug ...How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…
... basic with its so simple sprite instructions i did good versions ...
