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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 …
... . L=10
LD H,SCREENTABLE/256 ; POINT H TO FA00H, SO HL ... H ; INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... /> INC H ; *256 TO GET NEXT LINE
LD A,(DE ... -
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 …
... , EG. L=10
LD H,SCREENTABLE/256 ; POINT H TO FA00H, SO HL ... H ; INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... -
Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... =xpos (0-255)
ld h,screen_xpos_table/256 ; point h to beginning of xpos ... of screen
ld h,(hl) ; h now = screen address (left hand ... -
Moving a line down the display in assembler?...It's not a "[I]how can I do it[/I]" question, it's more a "am I missing something in trying to do it a new way" kinda question. What I've been doing…
... ld h,SCRTABLE/256
add a,(hl)
inc h
ld h,(hl)
ld ... ld h,SCRTABLE/256
add a,(hl)
inc h
ld h,(hl)
ld ... -
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 +…
... /> ld hl,48640
ld de,48641
ld (hl),191
ld bc,256 ... />
ld h,pixel_address_A/256
sla c
ld l,c
ld sp ... a
ld h,colour_address_A/256
ld l,a
ld sp,hl
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…
... z, .nextline
ld de, (scr_out_row)
ld h, tbl_rows/256 ; address of the ... font
ld h, 0
ld d, FONTBASE/256
ld e, h ; zero E ...
drawcursorbody
ld de, (cursor_row)
ld h, tbl_rows/256 ; address of the ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... y
ld h,$taby1/256
ld d,$tabx1/256
ld a,(de)
inc h
ld h,(hl)
ld l,a
ld a,(de ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ld l,b ;cord y
7 ld h,$taby1/256
7 ld d ... ,$tabx1/256
7 ld a,(de ... ld l,b ;cord y
7 ld h,$taby1/256
7 ld b ... ,$tabx1/256
7 ld a,(bc ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ,lp_mpt1
inc h
lp_mpt2 ld a,l
... inc h
ld de,#4000
ld b,#c0
lp_mpt3 ld (hl ... br /> inc h
ld (hl),d
dec h
inc ...help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …
need a Table of 256 bytes stored on a 256byte boundary
on entry: a=byte to mirror
FlipByte:
ld h,TableAdress/256
ld l,a
ld a,(hl)
retAn MC question (sorry, there's no MC forum to post to!)Ok, still struggling with learning MC - but am getting there. I just can't find anywhere on the web / in books that explains how to do arrays in MC.…
... /> add a,MyArray%256
ld l,a
ld a,0
adc a,MyArray/256
ld h ... ,a
ld a,(hl)
; time = 14 cycles
ld h,MyArray/256
ld a,(hl)
Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
... can put lineptrs on a 256-byte boundary and rearrange it ... into 256 low bytes followed by 256 high bytes. This ... /> ld h,lineptrs / 256
ld l,d
ld c,(hl)
inc h
ld ...Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
...
RRCA
LD L,B
LD H,LINEPTRS/256
ADD A ... ,(HL)
INC H
LD H,(HL)
LD ... L,A
LD A,C ... /> use
LD D,PIXELTAB/256
LD E,A
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... /> LD H,SCRTAB/256
ADD A,(HL)
INC H
LD H,(HL)
LD ... L,A
LD (SCRADR),HL ...
LD A,H
SUB 16
LD H,A
INC ...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 …
... . L=10
LD H,SCREENTABLE/256 ; POINT H TO FA00H, SO HL ... H ; INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... /> INC H ; *256 TO GET NEXT LINE
LD A,(DE ...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 …
... . L=10
LD H,SCREENTABLE/256 ; POINT H TO FA00H, SO HL ... H ; INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... /> INC H ; *256 TO GET NEXT LINE
LD A,(DE ...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 …
... , EG. L=10
LD H,SCREENTABLE/256 ; POINT H TO FA00H, SO HL ... H ; INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ...Shoot-em-up Development UpdateHi Folks, I am still working away at my horizontal scroller. Here is a link to let you see progress. I have re-written the scrolling routine to make…
... New]RENDER2 EXX: LD H,TILEMAP/256: EXX
LD IXH,SCROLL_HEIGHT[/FONT ... AND %10111111: LD H,A
LD SP,HL
LD H,D: LD L,E ...In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…
... reserve one N-byte long, 256-byte aligned "page", fill it ... place, like:
ld h,PAGE/256
ld l,a ; A = byte ...
ld (hl),a
Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... -255)
ld h,screen_xpos_table/256 ; point h to beginning of ...
ld h,(hl) ; h now = screen address ( ... -255)
ld h,screen_xpos_table/256 ; point h to beginning of ...Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... =xpos (0-255)
ld h,screen_xpos_table/256 ; point h to beginning of xpos ... /> inc h ; Move h to beginning of screen address
ld l ...Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... =xpos (0-255)
ld h,screen_xpos_table/256 ; point h to beginning of xpos ... /> inc h ; Move h to beginning of screen address
ld l ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... h ; 4
jr nz,wait1 ; 12/7 20/15
ld h ... ,base/256 ; 7
ld l,(hl) ; 7
inc h ; 4 ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... h ; 4
jr nz,wait1 ; 12/7 20/15
ld h ... ,base/256 ; 7
ld l,(hl) ; 7
inc h ; 4 ...A new Apple 1 emulator for the SpectrumHi all, I'm happy to announce a new Apple 1 emulator for the Sinclair ZX Spectrum! It's a port of Simon Owen's Apple 1 emulator for the SAM coupe to…
... /> main ld a,(de)
ld l,a
ld h,table/256
ld h,(hl ... $71,$73,$72 repeat until 256 bytes filled
org ... you can change the LD H,N in LD H,B reaching every code ...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... ; output HL
FAST: LD H,TABLE/256 ; 2 / 7
... 7
LD H,A ; H = 01000yyy 1 / 4
LD A,B ; ... ; output HL
HIBRI2: LD H,SMALLTAB/256 ; 2 / 7
...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... =L; output HL
FAST: LD H,TABLE/256 ; 2 / 7
ADD ... /> INC H ; 1 / 4
LD H,(HL) ; 1 / 7
LD L,A ...So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…
...
LD H,'PRT_RND ;256-byte table
CURND LD A,0
INC A
LD ... (CURND+1),A
LD L,A
LD B,(HL ...Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
... /> ld h,a
ld a,b
and 7
add h
ld h ... ,a
ld a,b
... a
ld h,a
ld l,0
srl h
... /> ;
build_tables ld h,shiftbyte/256
ld l,255
ld b,255
PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…
... [code]
ld hl,10000
ld de,9000
ld bc,8000 ... 'ld hl,10000' is equivalent to two 8-bit loads: 'ld h,10000/256 ... ' and 'ld l,10000-(10000/256)*256' but is done ... bit load equivalents were 'ld h,$27' and 'ld l,$10'. This ...
