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Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …
... how many bytes it can copy to screen between T=14336 (end ... ). basically, it simulates copy from back buffer to screen.
[/code]
POP routine
[code]
(POP DE
LD ... ?
LDI - 2160 bytes
POP - 2400 bytes -
Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... "work of pure genius" spectrum screen (and then for the vertically ... />
The raster draws the screen one line at a time ... it'll look crap. Your screen arrangement punishes you for trying ... any of the block copy operations or even PUSH to the display. -
yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... can use the screen as temporair executional ... ]
;; ------------------------------------------------------------
_kbd_init: push hl
ld hl,_kbd_prev ... ; clear _kbd_bend
pop hl
ret
MF3Z80 without +3e (like M3Unlock)Recently I've had a pop again at putting the copy protected Rainbow Islands onto real +3 disk. Some people may remember I tried to do this some time …
... 've had a pop again at putting the copy protected Rainbow Islands ... WOSser.
[*]At the first screen asking to cheat take a ... game crashes after the first screen).
[*]MF3Z80 on the disk ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
; attach stream
pop hl ; the first address plus ... ; character map in FONT
push hl ; save font address
pop hl ; restore the font address ... ; WRITE A CHARACTER TO THE SCREEN
; There are four ...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 …
pop reads two bytes from SP into specified register pair and increases SP by two. push decreases SP by two and stores two bytes from specified register pair to SP. These operations are not copy anything.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 …
... . So the only way using POP/PUSH is to use all the ... (without reading about it), that push, pushed the value off the ... the above work would be PUSH (OLDSP), if it existed. You ... drawn to the screen with HL pointing to screen, and LD (HL ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... breakdown of PUSH BC is:
PUSH dd pc:5 ... on average 16T per PUSH instead of the usual ... to much more blocks per screen, for fairly reasonable cost, ... That means I only POP each line of each ... you were doing whole screen at once, whereas you ...SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... /> push af ;
call doit1 ;
pop af ;
pop de ;
pop bc ... the
ld (chrad), hl ; screen and calculate the address in ... position, place it on the screen
and a ; one ... left hand side of the screen.
ld a, (coords_y) ;< ...SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... at 63550. Call it with COPY 63550. IM2 mode is then ... a hi-res CLS with COPY 44252.
[code]rep_j ... />
zap_loop:
push hl
push de
push bc
ld ... /> ld c,l
pop hl
push bc
ret
Maketzx...Whats the state of play?Been out of the whole emulation bit for...a while :) But, back in the saddle, ready to transfer some more tapes.....except...maketzx doesnt seem to w…
... of saving an almost exact copy of the software... Snapshots are ... the loaders and the loading screen. TAP files won't work ... 're going to have a pop at them, then you'd ... also have to have a pop at Taper when a stop ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... code that then renders the screen.
2. Platforms are ... scroll that copies rows of screen data, but is able to ... the sequence of copy statments, so it can copy from a rolling ... sequences of PUSH statements from a map store into the screen rendering ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... ,hl
pop hl
; HL now holds screen$ address
byte_A1D8 ... sp,iy
pop bc
pop de
pop af
exx ... bytes of screen
push_8B00:
DUP 14
push af
Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
... ; **********************************
; xy coords to screen pixel position
; **********************************
... store h for later
push bc ; 11t - store ... again
; *************************************
pop bc ; 10t
ld ...Jet Set Willy II - collecting objectsThe POKE to reduce the number of objects you need to collect doesn't seem to work. [CODE]POKE 34686,1[/CODE] It looks correct. It changes the CP 150…
... go to the master bedroom screen (then the code is run ... /> LD A,B ;quicker than PUSH BC
LD L,(IX ... /> LD B,A ;quicker than POP BC
DJNZ $75EA
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... /> PUSH BC
PUSH DE
PUSH AF
CALL DOIT1
POP AF ... ,181 ; mod to access lower screen
SUB B
... ,191 ;mod to access lower screen
CALL PIXADD+2 ...Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... . the main loop sends the screen (SCR) bytes to the pc ... , 0x1b00
_main: ;; send screen bytes at 115.200 bauds ... />
send: push bc
call _rs232_write
pop bc
dec ...Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... font (which I had to copy from a text editor due ... /> do_it:
push hl
push bc
push de
push af
call doit1
pop af ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
...
pop af
Don't you mean push? It ... code does with AF is copy from memory to registers....not ...Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... /> ld (chrad), hl ; on the screen and calculate the address
screen
call pixel_add + 2 ;
pop bc ; restore count
push hl ; save mask ... left hand side of the screen.
ld a, (coords_y) ;
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
...
pop af
Don't you mean push? It ... code does with AF is copy from memory to registers....not ...fast font engine possible?inspired by the recent "proportional font" thread for zx basic and ideas for gui and having done some of the work on this in the past i wonder if it …
... /> push ix
push hl
push de
push bc
push af ... /> pop af
pop bc
pop de
pop hl
pop ix ... br /> ; scroll the whole screen one line up
... routine expects a blank screen line and does no ...Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... zero found
push hl
push de
push de
... from ROM to screen
pop de
pop hl
... /> ;restore text pointer and screen pointer - increment to next ... character and screen position
jr pmess_loop2 ...GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
...
; attach stream
pop hl ; the first address plus ... ; character map in FONT
push hl ; save font address
pop hl ; restore the font address ... ; WRITE A CHARACTER TO THE SCREEN
; There are four ...Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... 2 (lower or upper screen) then call 5633 to ... you can use full screen PRINT AT and it ... will set to the right screen. After the PRINT AT ... characters on the right defined screen
[code]
; ... PRINT AT Y,X full screen
; Y = B-reg, ...Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... for display text to the screen.
It ... It will print anywhere on screen and in whichever PAPER ... RET
SPRINT POP HL
LD A,(HL ... br /> INC HL
PUSH HL
AND A< ...Last Sunset for LatticaHere's a [b]rough first draft[/b] of the [url=http://www.users.globalnet.co.uk/~jg27paw4/pourri/lattica.gif]Lattica map[/url], just to demonstrate th…
... bounces back into the screen it just came from ... org $F834
PSAVE: PUSH HL ; F834 E5
LD ... 22 85 F8
POP HL ; F847 E1
POP HL ; F866 E1
Move objectHi again, I am using paper colors to represent game objects. I have a "paddle" that is 4 pixels wide. I save its position as a 2 byte word in memory…
... idea than storing the screen address directly. For one ...
or
PUSH DE
POP HL[/QUOTE]
screen line for paddle
< ... ; copies attributes = PAPER 6 to screen
ld h, ...
