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Key press to ASCII valueI need a bit of code that will give me an ASCII value when the key is pressed. I only really need a-z. I tried using the following code but it only s…
... br /> ld hl,SPkeytranstbl
add hl,de
ld a,$fe ; check ... 40
add hl,de
.nocaps
ld a,f ; ... 80
add hl,de
.nosym
ld a,(hl) ; a = ascii code ... -
Programming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…
... LD A,(HL) 1
INC HL 1
INC HL 1
ADC A,(HL) 1 ... first addition without CF (=0)
LD (HL),A ... 1
DEC HL 1
DJNZ LOOP ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... hl,2
add hl,sp
ld a,(hl) ; a = N
inc hl
inc hl ...
ld e,(hl)
inc hl ... ,(hl)
inc hl
ld b,(hl) ; bc = colours
ex de,hl ; hl ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... /> ld b,0
add hl,bc
add hl,bc ; hl = &encoder[c ... hl
ld a,(hl)
inc hl
ld h,(hl)
ld l,a ; hl ... -
ANN: midi2ay 0.1Well, here's the MIDI-to-AY converter I promised. I've named it "midi2ay" (original name eh?) [url="http://es.geocities.com/qllaria/midi2ay/midi2ay-…
... not necessary
2. Add a loop mechanism
3 ... /> finrsi ld (pos),hl
dec a
ld (hl),a
finrsi_with_loop
xor a
end_rsi
Machine Code: quicksort optimisationI came across this z80 quicksort implementation when going through the wikipedia article on the same. It's 44 bytes long. I was wondering if any of …
...
dec hl
add hl,hl
add hl,bc
; bc = left, hl = right
a,(hl)
ld (bc),a
ex af,af
ld (hl),a< ... br /> inc hl
inc bc ; bc ...128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…
... /> push hl
ld a,(de)
ld (hl),a
inc ... br /> pop hl
ld a,32
add a,l
... ld l,a
ld a,(de)
ld (hl),a ...Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... over again and poking A into the address HL.
[/quote]
A' = sprite height (see 50552-50554 ...
DE = amount to add to HL after the width
of ...Run Length DecodingRun length encoding/decoding is far less efficient than using a modern compression program.
... ld a, l
add a, 32
ld l, a
ld a, ... br />
ld hl, comic_adr ;adress in screen memomory ... br />
unpak_scr5 ld (hl), a
push af
call ... /> inc de
ld (hl), a
call slow_downhl
...Timex 80 column display driverI subsequently wrote an 80 column font driver for 512x192 mode.
... l,a
add hl,hl
add hl,hl
add hl,hl
ld de,font-100
add hl ... 2 pixels
ld a,(hl) ; a = screen byte
and #c0 ...Best and Easiest web authoring program?I have to do a web page for my missus who does freelance ceramic design, framed kids naming pictures, kids pictures etc etc etc. I have used dreamwea…
... it produces to be a little weird although it ... br />
There is a dedicated newsgroup
[url=" ... /group/Google-Page-Creator?hl=en"]http://groups.google. ... .uk/group/Google-Page-Creator?hl=en[/url]
add.
I have a lot of ...MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …
I only fully tested ADC HL,DE and it took all ... MEMPTR = rp1_before_operation + 1. If I add 1 to what I call ...MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …
... =Fraser]I only fully tested ADC HL,DE and it took all ... MEMPTR = rp1_before_operation + 1. If I add 1 to what I call ...MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …
... in the same group as ADD/ADC/SBC rp1,rp2. Were these ... offset. I was testing on a +2A.MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …
... in the same group as ADD/ADC/SBC rp1,rp2. Were these ... offset. I was testing on a +2A.[/QUOTE] hmm.. according to ...finding largest value (z80 assembly)suppose we have to write z80 program which requires to find the biggest value in a block of memory starts from the address 101h until address stored …
... psuedo code :-)
load hl with the start of the ... with value pointed to by hl (ie. the current smallest number ... of hl > a then
load a with the contents of hl
end if
increment hlfinding largest value (z80 assembly)suppose we have to write z80 program which requires to find the biggest value in a block of memory starts from the address 101h until address stored …
... hl,101h ; set the first value to hl
ld a,0
add a,(hl) ; a ... =content of hl
Key press to ASCII valueI need a bit of code that will give me an ASCII value when the key is pressed. I only really need a-z. I tried using the following code but it only s…
... ld hl,KeyTransTables
add hl,de
ld a,$fe ... ld e,40
add hl,de
... br /> add hl,de
NoSym: ld a,(hl) ; a = ...Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... : I've started using a ld a,r command to grab ... [/quote]
Yeah, not a very good random number generator ... compact on PC, quite a gonzo-routine on Z80. ... br /> ld hl,(int_seed)
ld a,h
add a,a ;Set highest ...Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…
... , speccy is a bit slow to draw a complex 3D scene ... . you can define a reference point for every ... 8bit signed numbers and add result to refence point. ... you avoid many 16bit ADD and RL instructions. for ... 85T ? Nope! 7T: ld (hl), a ..." Of course, this is an ...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…
... ; l=ypos (0-192)
add a,(hl) ; a (containing xbyte) += hi byte of ... ; l=ypos (0-192)
add a,(hl) ; a (containing xbyte) += hi byte 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 table
ld a,(hl) ; a = x byte (e.g. if ... ; l=ypos (0-192)
add a,(hl) ; a (containing xbyte) += hi byte 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 table
ld a,(hl) ; a = x byte (e.g. if ... ; l=ypos (0-192)
add a,(hl) ; a (containing xbyte) += hi byte of ...+2 ramdisk - access in machine codeHow can you access the ramdisk in machine code? I've got a +2, and it seems the ramdisk has never been properly utilised. It would be a handy little…
... />
inc a
ld e,a
add a,a
add a,e
rra ... for source
; a'hl = source address, a' = out byte to port ... ; page in destination
ld (hl),a ; write byte
inc ...Scrolling Loader CounterPlease can someone help me with writing a scrolling counter for a loading system. I like the Hewson counter so i`ve taken the font from zynaps loade…
... gfx
ld (hl), a ;put gfx into screen ... of gfx
inc hl ;increase it
... you have to add is a simple check ... then jump
ld hl, first_byte_of_gfx ;YES
...tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... [code]
call gethl ; hl = screen address at column 31 ... scanline:
push hl ; save column 31 address
ld (hl),a ; write first byte ... a
ld a,l
add a,31
ld l,a
ld (hl ...tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... /> [code]
call gethl ; hl = screen address at column 31 ... address
ld (hl),a ; write first byte into ...
ld a,h ; change hl to attribute address
a
ld a,l
add a,31
ld l,a
ld (hl ...ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…
... test is flawed. Given that a real spectrum fails, we cannot ... used? It may only be a timing difference, but we don ... of &0100 could make a difference."
AFAIK timings ... , it failed these ones:
hl,
bit n,(+1)
Wanted: z80 asm routines...for the Sam. This call goes out to Colin and others who know how it should be done. If you look on the Sam C disk you can see the implementation…
... hl,4
add hl,sp
ld a,(hl)
dec hl
ld d,(hl ... )
dec hl ...
ld e,(hl ...Who knows how to program a "pathfinder"?Hi all. I like to play games like "Colour Lines" and I think, I will create a version of this game for the SAM Coupe. It looks easy - until this "dam…
... hl),a
jr z,next
ld a,255
ld (hl),a ... noempt
ld a,l
add a,16
ld ... l,a
call check ... br />
check ld a,(hl) ; fetch value near field< ... blocked field
ld (hl),a ; path+1
...
