-
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 …
... /> ld sp,screen+0x0020
push hl ; 4T ... lost to contention
push bc ; 5T lost to contention ... push hl
push de
push bc
exx
push hl
push ... de
push bc ... -
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…
... the breakdown of PUSH BC is:
PUSH dd pc:5 ... on average 16T per PUSH instead of the usual ... 24T to do a contended PUSH.
Now ... to much more blocks per screen, for fairly reasonable cost ... 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…
... registers, call the printing
push bc ; routine, put all the registers ... 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) ;
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…
... ' and IX, and to PUSH them to screen memory takes longer, so ... the contended way the screen memory works, the PUSH IX instruction can ... half as long again as PUSH BC.
If, instead of ... rendering each line of the screen, which still means using a ...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…
... straightforward as ld hl ,nnnn; push hl....
... tile would be PUSH AF, PUSH DE, PUSH BC. If there was ... tile there would be PUSH HLs after that (remembering ... the left of the screen). So what registers are ... one tile on the screen at that time its ...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…
... - plot double sized character on screen
; input - h- ... /> ; **********************************
; xy coords to screen pixel position
; **********************************
ld ... store h for later
push bc ; 11t - store loop counter ...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+0 ... B,A ;quicker than POP BC
DJNZ $75EA
RET ...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…
... .
DO_IT: PUSH HL
PUSH BC
PUSH DE
PUSH AF
CALL ... ,181 ; mod to access lower screen
SUB B
... 182 ;mod to access lower screen
JP NC,ERR5
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 ...
_main: ;; send screen bytes at 115.200 bauds ...
ld bc,VMEM_SIZE
send: push bc
call ... _rs232_write
pop bc
dec bc
...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…
... TOKENs, clears the area of screen you're about to print ... /> ld (chrad), hl ; on the screen and calculate the address
ld bc, 0xff03 ; mask
push bc ; save mask
and ... left hand side of the screen.
ld a, (coords_y) ;< ...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 …
... br /> push ix
push hl
push de
push bc
push af< ... br /> .yposOk:
; calc screen address
; A is ypos ...
; scroll the whole screen one line up
call ... printing routine expects a blank screen line and does no ...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…
... channel below BASIC area
push bc
call 0x1655 ; ... 00001111 ; mask half of the screen byte
or c ... back to screen
inc d ; next screen location
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…
... channel below BASIC area
push bc
call 0x1655 ; ... 00001111 ; mask half of the screen byte
or c ... back to screen
inc d ; next screen location
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…
... channel below BASIC area
push bc
call 0x1655 ; ... 00001111 ; mask half of the screen byte
or c ... back to screen
inc d ; next screen location
Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... ld (hl),a ; Write to screen (7)
... ; Point to next screen position before POPing HL< ... scroll_down push hl ; Preserve registers
push de
push bc
push af ... br /> scrntab defw 16384 ;screen address table
defw ...Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... blank out the screen by pointing SP ...
add hl,bc ; 11
... bc ; 11
exx ; 4
push hl ; 11
push ... de ; 11
push bc ; 11
push af ; 11 - PUSH ...line, plot and circle in whole 256x192 displayhi! are there some way to draw lines, or whatever, in the whole 256x192 display, than just the above 256x176 part? (this is the msx1 version i made o…
... plot xy is created!
PUSH BC ;save briefly
CALL ... LD H,B ;now HL = screen addr
AND %00000111 ;now ... LD (HL),A ;move to screen
POP HL ;coords
Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
... br /> RET
L61559: PUSH BC
PUSH DE
EXX
LD ... DE)
RET
L61748: PUSH DE
LD DE,(half_vrange ... /> DEFS 172
SCR_TABLE: ; SCREEN ADDRESS TABLE NOW FOLLOWS IN ...Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
... $0ats
l_f077: push bc ; f077 c5 $0bts
push de ; f078 d5 ... f112 c9 $0ats
l_f113: push de ; f113 d5 $0bts
l_f134: push de ; f134 d5 $0bts
;
; screen address table
;
l_f200 ...Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
...
RET
L61559: PUSH BC
PUSH DE
EXX
LD ... ,(DE)
RET
L61748: PUSH DE
LD DE,(half_vrange ... page boundary
SCR_TABLE: ; SCREEN ADDRESS TABLE NOW FOLLOWS IN ...tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…
... it doesn't clear the screen either). I'm afraid that ... 244
PUSH HL ; 229
SBC HL, BC ; 237 66
LD SP, HL ; 249
PUSH BC ; 197
LD (23613), SP ...Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... a
ld bc,face_sprites
add hl,bc
face_loop1 call ... now.
ld bc,face_sprites
add hl,bc
;if I ... ;If you understand the Spectrum screen layout this al makes perfect ... and B is the screen.
face_loop2 push de
;remember ...Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... data address
push bc
push hl
ld ... width in characters
; hl' = screen address
; b' = pixel y ... pixel row
; hl' = screen address
; b' = pixel ... br /> ; exx ; hl = current screen address
; or (hl)
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... LDIR instruction to move the screen buffer from memory to where you ... avoids any problems with the screen refresh that occurs every ... the stack. Using PUSH to write into the screen is faster than ... contention), LDI takes 16, and PUSH writes two bytes in just ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... /> push af
push bc
push de
push hl
push ix
push iy ... )
; last byte of the screen
ld hl, $ + 9 ; set ... /> exx
push hl
push de
push bc
push af
defb ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... ]putting 2 bytes in the screen with LDI it takes 32 ... /> push iy
push ix
push hl
push de
push bc
push af ... /> exx
push hl
push de
push bc
push af
ENDM ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... HL,$E900 ;START OF VIRTUAL SCREEN
LD (STACK1),HL
PUSH IX
PUSH AF
PUSH DE
PUSH BC
PUSH IY
screen segment, if e.g h ... we are in the same screen segment
VOLFU EXX ...
