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64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... T-states to copy from buffer to screen. If you change it ... /> [CODE]pop de
ld a,(de)
ld h,c
ld (hl),a ...
inc h
ld (hl),a
inc h
ld (hl ... *48=3072 chunks on the screen, this is the overhead of ... -
64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... ]pop de
ld a,(de)
ld h,c
ld (hl),a ... pixels from linear buffer to screen took 50,142 ... Therefore copying entire buffer to screen will be 49,698 ... = 1,713 pixels on screen one-by-one every frame ... more than 55% of screen. This probably makes sense ... -
Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…
... 00100 ;
00110 ld sp,24984
00120 ... ld hl,16384
00180 ld de,16385
00190 ld bc,6911
00200 ld (hl ... postcount=24"]compressed screen file [LOMMSP][/ ... -
New Game(s): Sir Ababol 2 and Sir Ababol DXHere is our own Christmas Present from Mojonia! We weren't going to release these games (at least, by the moment) but we decided just yesterday to fi…
... we've moved on
pop bc
djnz dklp
... upper or lower screen depending on channel
ld a,22 ;rom ... /> ld (hl),b ;get port which we LD A, to
inc hl
ld (hl ... in game LD HL,key1, LD A,(HL), IN A,(254), INC HL, AND (HL), CALL ... -
Vertical XOR filler.. anyone?Hi, I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just tryin…
... :
pop de ;two bytes from a linear screen buffer (Y in ... L, X in H)
xor e
ld (hl ... h
xor d
ld (hl),a
inc h
Vertical XOR filler.. anyone?Hi, I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just tryin…
... :
pop de ;two bytes from a linear screen buffer (Y in ... L, X in H)
xor e
ld (hl ... h
xor d
ld (hl),a
inc h
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... LD H,0
ADD HL,HL
ADD HL,HL
ADD HL,HL
LD DE ... POP HL
INC L
POP DE
POP BC
RET;GET2 LD A ... ,H ; Get ATTR Address from screen address ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... de ;save screen address
call print_tall_char
pop de ;screen address
add hl,hl ;x2
add hl,hl ;x4
add hl,hl ;x8
ld bc,15360 ... addressed by HL at screen address DE over 16 lines
ld b ...Mirror tableCan anyone help with a byte mirror table? e.g. so you can look up a byte of a left-facing sprite and return the correct right-facing value. There …
... /> [code] pop de
ld c,e
ld a,(bc)
ld (hl),a
dec l
ld c,d
ld a,(bc)
ld (hl ... order, therefore step over the screen (that [i]or[/i] the ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... /> ;; ------------------------------------------------------
_con_putcharxy::
pop hl ; get return address
pop bc ; c=x, b ... ; and data
ld (hl),a ; to screen
dec hl ; vmem pointer back ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... ) When you put it to screen (using hi-res x coordinate ... vid_nextrow
ex de,hl
pop bc
pop af
dec a ... /> push hl ; store hl
ld b,#BYTSROW ; bytes
ls_clrlne_loop:
ld (hl),#0 ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
...
ld b, 0
REPT 5
add hl, bc ; character gfx ... for all lines
pop hl ; restore original screen location
ret ; all ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
...
ld (hl), a
inc de
inc h
pop bc
ld b, (hl) ; place gfx on screen
or b
ld (hl), a
ld ...Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…
...
;
pop ix ; 5f6e dd e1 $0ets
ld c, (ix ... a ld sp?
jr nz,chkb8 ; go forward if not
ld bc ... ld hl,$0040 ; 64 instructions
ld ($9c79),hl ; lower memory addresses
ld ($6f19),hl ...What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…
... Printer.
LD SP,(#5C3D) ; ERR_SP. Purge the stack.
POP HL ; Remove ... br /> PUSH HL ;
LD HL,PRINT_A_1+3
PUSH HL ;
LD HL,ERROR_1 ; $ ... placed in the ZX Printer buffer, so you'll better ...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…
... LD HL,50213 ; MAP START ADDRESS
LD DE,16384 ; SCREEN START ADDRESS
LD ... LINE OF THE SCREEN, 32 CHARS
POP DE
LD BC,32 ; 32 ... MAP
LD HL,22528 ; FIRST ADDRESS OF SCREEN ATTRIBS
LD (HL),A ; LOAD ...128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…
... 5
ld de,16385
ld bc,16383
ld (hl),0 ; ... />
ld (hl),0
ldir
ld sp,49152 ; Point SP so ... ROM bank 1
; leaving screen 0 visible.
; Changing ...Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... INKed pixels within a random screen rectangle: [code]
900 CLEAR ...
ld a,(HL)
POINTLP:rlca
djnz POINTLP
pop bc
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…
... br /> ld bc,$0507
push bc
call addfunc
pop af ... hl,sp ; HL now points to what you PUSHed before calling addfunc
ld ... You see: no PUSH or POP in addfunc. No need ... to POP things of the stack ...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…
... much faster and smaller 'ld r,(hl) ; inc hl' to grab values as ... because for pixel placement on screen the engine has to rotate ... form the graphic written to screen.
Here is the ... in a char to a buffer at address SP1V_PIXELBUFFER. ix points ...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…
... POP your first two bytes into HL and write with LD (NN),HL, then ... stack-based shift using AF,BC,DE,HL and alternates and IX ... quick (10 cycles) and LD (NN),HL takes 16. Though it might ... the pixel part of the screen. Is this deliberate, to test ...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…
... forgot: a large bunch of POP HL: LD (NN),HL. 13T/byte uncontended, same ... way of POKEing the LD HL,NN: PUSH HL thing effectively...)[/color]
buffer RAM is in uncontended memory ... the raster is drawing the screen - what's it like ...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…
... forgot: a large bunch of POP HL: LD (NN),HL. 13T/byte uncontended, same ... bunch of "LD HL,nn; PUSH HL" instructions. Drawing into the buffer amounts to ... background pattern for free. Put BC and AF to the mix ...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…
... forgot: a large bunch of POP HL: LD (NN),HL. 13T/byte uncontended, same ... bunch of "LD HL,nn; PUSH HL" instructions. Drawing into the buffer amounts to ... two registers, i.e. LD DE,NN: LD BC,MM: PUSH DE: PUSH ...P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…
... a kind of horizontally looped buffer so that you only need ... that gets copied to the screen, load SP with a suitable constant ... /> ld (hl),a
dec l
ld a,(hl)
dec l
ld (hl ...P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…
... gets copied to the screen, load SP with a suitable constant ... and insert an extra ADD HL,SP before the JP PE ... ld (hl),a
dec l
ld a,(hl)
dec l
ld (hl ... , or uncontended buffer RAM, to avoid writting to screen (contended RAM ...
