-
Easy way to print text in machine code?Please? It sounds so simple, but I've never done it. At the moment I'm grabbing the start address for each letter then printing them out one at a t…
... or c ;add collumn in line
ld e, a ;or ... h, 0
ld l, a
add hl, ... hl, (text_pos)
ld e, l
ld d, h ...
inc l ;move to next position ... />
ld a, d ;computing attr adress ... -
New member here. And a spider! :)Hello everyone. My name is Sekrets. I'm quite a lonely individual, searching for a digital home where I might find fellow speccy enthusiasts to adopt…
... 8 cycles:
ld e,l
ld d,h
ld hl, col
ld c,(hl)
which takes ... versions having to do with C interface issues). The code is ... or l
32 ld l,a
33
34 ld a,h ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... e ;printable character is actually ASCII 32, a SPACE
ld l,a ... only really
ld c,a ;necessary for when printing ... in DE
add c ;
ld e,a ;
ret ;
.......
ld a,c
ld (de),a
; ... -
A neat little BASIC trick(from a type-in by Robert Burgess) This one line of code completely bamboozled me for a while, as it seemed impossible for it to produce the result s…
... would type "H a l f P r i c e !" and leave it ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... /> ; ld h,0
; ld l,a
; add hl,hl
a merge]
inc l
ld a,l
and ... a,c
srl a
srl a
srl a
add e
ld e,a ... -
'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
... coords
;input: B=Y,C=X
;output: HL= ... and #e0
ld l,a
ld a,b
and #18 ... /> ;input: HL=screen address, A=char
printChr< ... ld h,0
ld l,a
add hl,hl
ld a,(de)
ld (hl),a
inc e
... -
Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …
... attributes area
ld e,l ;x
ld l,h
ld ... /> add a,a
add a,a
add a,a
dec a
dec a
ld (hl),a
inc l
dec c
jp nz ... /> ld a,l
sub #e0
ld l,a
sbc a,a
and ... -
Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …
... attributes area
ld e,l ;x
ld l,h
ld ...
add a,a
add a,a
add a,a
dec a
ld ...
ld (hl),a
inc l
dec c
jp nz ... /> ld a,l
sub #e0
ld l,a
sbc a,a
and ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... /> ld h,0
ld l,a
add hl,hl
a merge]
inc l
ld a,l
and ... a,c
srl a
srl a
srl a
add a,e
ld e,a ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... ld d,0
ld e,a
;transfer Attribute Byte to ... ,hl
srl c
srl c
srl c
ld b ... a,l
add a,32
ld l,a
ld a,d
adc a ... to
inc l
ld (hl),e
dec l
;increment ... -
Sprite RotatingI was looking (actually at Everyone's a Wally), and noticed that all the graphics for the main characters are left facing, and two characters wide. …
... d,#86
ld e,a
ld a,(de)
and #01 ... )
ld (hl),a
inc l
ld a,(de)
and ...
and (hl)
ld c,a
res 3,d
or c
ld (hl),a
set 3,d ... -
Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…
...
add a, a
add a, l
ld l, a
ld e, (hl)
ld l, a
call next_pixel
dec c
jr ...
ld l, a
call next_pixel
dec c
jr ... -
Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…
... ADD A, A
ADD A, L
LD L, A
LD E, (HL ... HL, $5060
LD C, $18 ; PIXEL LINES (BLACK ... /> LD L, A
CALL NEXTPIXEL
DEC C
LD L, A
CALL NEXTPIXEL
DEC C
Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…
... ADD A, A
ADD A, L
LD L, A
LD E, (HL ... HL, $5060
LD C, $18 ; PIXEL LINES (BLACK ... /> LD L, A
CALL NEXTPIXEL
DEC C
LD L, A
CALL NEXTPIXEL
DEC C
designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... fetching "bytes" (e.g. 8-bits) at a time
... bit registers: B, C, D, E, H, L and A) and their 8 ... processor to accept a byte at a time (which it ... 4) Call your registers: A, B, C, D, E, F, G, H< ... 00110rrr then AND C (AND register C with register A) will become ...Sorting an array...Hi Folks, Over the weekend I had a play with sorting algorithms - takes me back to my student days! :-o My first try was with the good old Bubble S…
... br /> ld a,c
LINE50: add a,(IX+2) ;A =t=j+ ... ; BASE ADDRESS
ld e,(IX+0) ;E =j ROW j INDEX ... /> ld a,(hl) ;A =l$=v$(j)
ld (IX+1),a ; =l$=v$(j ...Sprite RoutineI was wondering if anyone could point me in the direction of a really basic example of a per-pixel sprite routine? Preferably commented. The screen …
... DE
INC L
LD A,(DE) ;read graphics source ... A,L ;going to new character line
ADD A,32
LD L,A ...
RET C;going to new ... screen segment, if e.g ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... di ; *IMPORTANT*
ld a,e ; Check for NULL length?
dec e ; 4
jr nz,bit ... ; Subtract length
ld a,e
or a,d
jr nz ... a,l ;
ld l,a ;
dec bc ; Subtract length
ld a,c ...Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
... /> inc hl
ld (hl),c ; 56h
dec hl ... hl
and a,00001111b ; 04h
ld c,(hl) ; 56h
; < A = Corrupt
read12bit_low ld e,l ; *Store array ... by getting the B and C registers the wrong way round ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... /> ld (ix+SPR_def+0),e ; LOW
ld (ix ... br /> ld c,(ix+SPR_ypos)
ld e,(ix+SPR_def+0 ... F D S A
; 251 T R E W Q ... frame table
ld e,(hl)
inc hl< ... ld a,l
add a,c ; Add X character offset
ld l,a
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... exx
ld a,l
exx
cp a,l
jr nz ... bc,49149
xor a,a ; Input
out (c),a
exx ...
dec de
ld a,e
exx
out (254 ... hl
ld a,e
or a,d
jp nz ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
...
ld r, a
ld l, e
ld h, d ...
ld c, 0
dec l
jr nz, peeb1
ld a, c
xor ... 16
ld c, a
out (254)
ld l, e ...Hacking the O.C.P Full Screen Editor/AssemblerIf you have been reading my posts recently then you will know that I am eager to have the sourcecode I wrote for the Spectrum during the period 1988 …
... the sourcecode format the O.C.P assembler used. Most of ... /> tu01 ld a,(de)
inc e
ld l,a
ld sp ...
ld l,a
pop bc
ld (hl),c
inc ...
ld l,a
pop bc
ld (hl),c
inc ...Hacking the O.C.P Full Screen Editor/AssemblerIf you have been reading my posts recently then you will know that I am eager to have the sourcecode I wrote for the Spectrum during the period 1988 …
... block bank
inc e
ld l,a
ld sp,hl ... 8 character
ld (hl),c
inc h
ld ... pop bc
ld (hl),c
inc h
ld ... pop bc
ld (hl),c
inc h
ld ... /> pop bc
ld (hl),c ; Set 1st colour
Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... /> db 121 ; ld a,c
db 176 ; or a,b
db ... br />
.region: ld c,(hl) ; Read count
inc ... one BYTE
ld a,c ; Check for zero?
or ...
.next: ld a,e ;
cp a,l ;
jr nz,.region ...New tool: ZXBOOT.EXE[B]ASM[/B] is proud to present the first release of ZXBOOT.EXE: [url]http://www.4shared.com/file/NP-FVOSf/zxboot__beta_.html[/url] ZXBOOT is a comma…
... +3/2a ROM?
and a,a
jr nz,skip
out (c),a
remap: ld ... page size
ld l,c
ld e,c
ldir
< ... ; Disable paging
ld a,00100000b
out (c),a
; ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... /> ld (ix+SPR_def+0),e ; LOW
ld (ix ... br /> ld c,(ix+SPR_ypos)
ld e,(ix+SPR_def+0 ... F D S A
; 251 T R E W Q ... frame table
ld e,(hl)
inc hl< ... ld a,l
add a,c ; Add X character offset
ld l,a
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... /> ld (ix+SPR_def+0),e ; LOW
ld (ix ... br /> ld c,(ix+SPR_ypos)
ld e,(ix+SPR_def+0 ... F D S A
; 251 T R E W Q ... frame table
ld e,(hl)
inc hl< ... ld a,l
add a,c ; Add X character offset
ld l,a
WOS drops some games.I made several links to zx games located on this site, but unfortunately those games are gone. What happens? Elite III - World of Spectrum [url]htt…
...
When you have picked a rule to follow, you might ... ,#1AFF
ld (hl),l
ldir[/code]or maybe ... code] inc h
ld a,h
and #07< ... a,l
add #20
ld l,a
jr c,.break
ld a ... stuf
ld a,d
or e
jr nz ...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…
... c,31
put_blanksprite2 ld (hl),e
inc l
ld a,l
and c
jr ... z,put_blanksprite4
ld (hl),e
