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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.
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 ... to the end of the screen memory area and push zero ... onto the stack until the screen area was filled.
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... hl, 0xd800 ; start of character buffer to HL
add hl ... ; offset to character in buffer
ld bc, paging ; prepare for paging ... , de ; 8
pop de ; unstack screen address
pop bc ; unstack character count ...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…
... downsides are that a screen buffer is a big overhead for ... br /> LDI background from buffer to screen to delete
... code]
[code]
;buffer in this example at 24576 ... nextlinedown ;DE down one screen line
pop bc
djnz sdlp ...Vector drawing routines.Anybody could point me to some sort of vector drawing package of routines, callable from BASIC? With "vector drawing" I mean to draw 2D pictures with…
... to fill from new screen position
pop bc ; moving up, pixel ... /> call fill
pop bc
.offscreen2
pop hl
... fill ; fill from new screen position
pop bc
.offscreen3
...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... stack pointer
pop hl ; get original screen position
pop bc ; get original ...Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
...
jr $
....
buffer: defs 32
pop af ; return address
pop hl ; uint num
pop de ; char *buffer ...
pop bc ; radix
push ...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 was ... stack to push and pop stuff to the screen, I gave it ... sp, buffer
pop af
pop bc
pop de
pop hl
pop ix ... /> pop af
pop bc
pop de
pop hl
ld sp, screen ...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.
#
...
# from the buffer to the screen
# NOTE - ... POP DE','POP BC\nEXX','POP IX','POP HL','POP DE','POP BC','POP AF']
self.copyPopList = ['POP AF','POP BC','POP ...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
< ...
POP IX
POP HL
POP BC
POP AF
... ENTRY:
; HL CONTAINS SCREEN ADDRESS
; DE CONTAINS ...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 …
... IS 1, FAST COPY BUFFER TO SCREEN
... /> POP DE
POP IX
POP HL
POP BC
POP AF
; HL CONTAINS SCREEN ADDRESS
; DE CONTAINS ...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…
... E,L
POP BC ;Put tile on the screen
LD (HL ... screen address for
SBC HL,BC ;next char. line
POP BC ... ,BC
ADD IY,BC
POP BC
DJNZ RLOOP
POP ...Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
... 4433 TStates to copy from screen to store)
screen
...
; Clear the screen to show we are bringing ... br /> inc hl
pop bc
ld (hl),c ...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, ... RRR CALL RUT
POP AF
JR LFF41< ... /> PUSH BC
LD BC,32
ADD HL,BC
... /> EX DE,HL
POP BC
DJNZ LOPP
...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 …
... stack pointer cheese and push/pop is faster to move data ... 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
; last byte of the screen
ld hl, $ + 9 ... pop iy
pop ix
pop hl
pop de
pop bc
pop ... br /> attributes:
incbin "screen.atr" ; 768 bytes of ...SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... 've been using the SCREEN$() function recently for reading ... data off the screen rather than taking up ... of BC
pop bc ;BC=$2d2b (discard)
pop bc ;BC=$3365
pop 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 ... /> pop bc
inc b
push bc
call print_char_obj_hl_b_c
pop bc
bc
ex de,hl ;de = address of char on screen
pop ...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 ; ... TO THE NEXT LINE
POP BC ; RETRIEVE THE LINE COUNTER< ... what I expected on 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 ... /> pop af
pop bc
pop de
exx
pop bc
pop de
pop ...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
ld bc, 32
ldir
pop bc
ENDM
; work out buffer insert address
ld hl ...
