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Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... :
When clearing the screen buffer, it was actually much quicker ... the end of the screen memory area and push zero values onto ... the stack until the screen area ... this worked because you could push 16 bits of data in ... -
Return of Speccy screen buffer formatI recently discovered that the Spectrum screen buffer format that allows only two colours in an 8x8 pixel block has made its return in a slightly dif…
... recently discovered that the Spectrum screen buffer format that allows only two ... -
Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... . Now I'm experimenting with screen buffer where I could draw my ... I would copy it to screen memory.
You may ... just copying static image from buffer to screen after HALT.
Edge Grinder, how would YOU do it?I always meant to post about this and AndyC reminded me in the 'vs' thread in games. [QUOTE=AndyC;808887]The thing I love about threads like this is…
... />
;;
PUSH BC ;store stuff
PUSH DE
PUSH HL
EXX ... /> decodelines PUSH BC
LD B,4 ; parts of screen
decodeparts PUSH BC
Help for beginner with z80Hi chaps, I'm reasonably new with z80, but had a fair amount of experience with 68000, so decided to give a few things a go. One little thing I'm t…
... />
;;
PUSH BC ;store stuff
PUSH DE
PUSH HL
decodelines PUSH BC
LD B,4 ; parts of screen
decodeparts PUSH BC
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 …
... to blit my back buffer to the screen RAM, and it ... stack to push and pop stuff to the screen, I ... ld sp, buffer
pop af
pop bc
pop ... bc
pop de
pop hl
ld sp, screen ... +18
push hl
pop de ...Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…
... /> # In this example the buffer matches the screen size.
#
... high
# from the buffer to the screen
# NOTE - See ... self.copyPushList = ['PUSH HL','PUSH DE','PUSH BC\nEXX','PUSH IX','PUSH HL','PUSH DE','PUSH BC','PUSH AF']
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... Sprites drawn on buffer
c) Buffer copied to screen
PUSH AF
PUSH BC
PUSH HL
PUSH IX
... :
PUSH HL
; CONVERTS A SCREEN ADDRESS TO ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... FLAG IS 1, FAST COPY BUFFER TO SCREEN
... /> PUSH AF
PUSH BC
PUSH HL
PUSH IX
PUSH DE ... :
; PUSH HL
;
; ; CONVERTS A SCREEN ADDRESS TO AN ...Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... />
LD BC,1760 ;adjust screen address for
... PUSH BC
PUSH BC
INC H
LD SP,HL
PUSH BC
PUSH BC ... first column
;HL=screen addr.
;DE= ...
LD BC,1823 ;Move screen addr.up and across ...Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …
... -loader" and she load screen verticaly line by line, ... most impressive.
Uncompressed screen must be at 49152, ... LD HL,01343
PUSH HL
IN A,(& ... (IX+0),L
PUSH AF
RRR CALL RUT ...
PUSH BC
LD BC,32
ADD HL,BC
...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... Pointer:
push af
push bc
push de
push hl
ex ... /> push af
push bc
push de
push hl
push ix
push iy ... screen
push hl ;Write 8 bytes from registers
push de
push bc ...Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... that stack pointer cheese and push/pop is faster to move ... use push/pop, but copying a four character sprite to the screen ... takes three cycles of push/pop.
screen buffer into 2x1 blocks and keep ...(part of) screen to UDGHere is a routine to copy a Y,X-position on screen to a UDG. 0<=y<=23 0<=x<=31 144<=udg<=165 (UDG "A" to UDG "U") [code] ; start code with ; PRINT …
Here is a routine to copy a Y,X-position on screen to a UDG.
0Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... byte order) buffer at 57484 to the Spectrum screen at
push af
push bc
push de
push hl
push ix
push ... br /> ; last byte of the screen
ld hl, $ + 9 ... /> attributes:
incbin "screen.atr" ; 768 bytes of ...SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
I've been using the SCREEN$() function recently for reading ... data off the screen rather than taking up ... for it. Instead of SCREEN$(row,col) use FN ... HL=$106E
push hl
push de
push bc
ld de ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... /> [CODE]
; Bi-Colour Scrolling-Buffer Game Engine for Four Player ... /> inc c
push bc
push bc
ld hl,char_frame_right
screen
ld a,(print_attr_cache)
Problem with BC corrupting after DJNZJust for fun, I'm messing around trying to get the level maps from Lemmings to display on the screen with machine code. It's been ages since I did an…
... line stored sequentially unlike the screen which is arranged differently.< ... DE,16384 ; SCREEN START ADD
LOOP1 LD BC,8 ; ... FOR 8 LINES
LOOP2 PUSH BC ; STORE THE LINE COUNTER
screen, after popping BC the DJNZ doesn' ...Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... routines, the source buffer is linear (not in screen order) and address ... /> push hl
push de
push bc
exx
push de
push bc
push ...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…
... offscreen buffer is the memory copied to the screen ... of the screen where you copy your buffer to,
if the buffer was copied to the screen so that the ... /> draw background on buffer (or just clear it ... draw sprites on buffer
copy buffer to screenTextured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
... Leave some space for shadow screen buffer
20 GO SUB 9000 ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... 1 (edit) clears the input buffer.
I also ...
; base address of the screen
SCRBUF_BASEADDR EQU #4000
.nextbyte
push bc
push hl
ld l, (hl ... set
; work out buffer insert address
ld hl ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> ; Fill Back buffer with a bright stripy pattern ... PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH ... ENTRY:
; HL CONTAINS SCREEN ADDRESS
; DE CONTAINS ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> ; Fill Back buffer with a bright stripy pattern ... PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH ... ENTRY:
; HL CONTAINS SCREEN ADDRESS
; DE CONTAINS ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> ; Fill Back buffer with a bright stripy pattern ... PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH ... ENTRY:
; HL CONTAINS SCREEN ADDRESS
; DE CONTAINS ...T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …
... data from linear backbuffer to screen... aprox 14.59T/B
push iy
push ix
push bc
push de
push af ;71 ... ;11 next line in back buffer
;FIRST ...
