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Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... /> ld c,$fe
loop ld b,$40
xor $10 ...
out (c),a
ld ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... ,b
ld b,c
xor 21h
ld e ... ,a
rra
jr c,a2s_addr ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... / map
ld c,a ;C=right hand mask
... x 3
jr c,a2s_l ;
push de ... b,c ;swap masks (right into left)
xor 21h ... BIT 0
jr c,a2s_addr ;if ='1' then ...printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
Kempston Mouse DriverHi Folks, Does anyone know the email of Chris Cowley who wrote the Kempston Mouse Driver in the WOS Archive? Many thanks Paddy
... br /> LD A,C
XOR %00000111 ; XOR offset to get ... mouse_y
left_edge
XOR A
LD (PointerXY),A ... mouse_btn
set_top_edge
XOR A
LD (PointerXY+1 ... br />
end_pointer
XOR 255
POP BC
Printing text using direct screen addressingHaving some problems printing using the FASE engine which is currently defeating me. Hoping to have someone clear out the bit of fog currently dwell…
... call preceded by doing a XOR #80 to the contents of ... /> add hl, hl
ld c, e
ld b, d ...Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
...
string
defb $c,txt_clr
defm "Put your ... /> inc de ;next cell
xor a ;zeroize A (number of ... br /> ld c,a ;bitmap byte into C
xor a ;clear A ...
char_shift
rr c ;shift through Carry
rra ...Retro Virtual Machine is out!Fantastic emulator Retro Virtual Machine (@retrovm) is out today. It can emulates Amstrad/Sinclair models range. Give a try! http://www.retrovirt…
... />
di
s1:
xor a
out (#fe),a ... a lot better with the C language than I am with ...counting in assembleri have this program which cycles through the character set. how do i do this with numbers say 0 to 65535? org 40000 ld b,120 ld (23612),a L…
... ; bytes in a number.
xor a
ld hl,value ...
display1
ld c,(hl)
rld
ld ... /> inc de
ld (hl),c
dec hl
djnz ...Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... /> ; On entry B = y1, C = x1, D = y2, E = ... SBC HL,DE
JR C,DBLYINT ; if deltax >= ... /> SUB E
JR C,DBLXYRD2 ; if x1 > ... /> SUB E
JR C,DBLSTDRW ; if y1 > ... /> LD A,(HL)
XOR B
LD (HL), ...Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... = 1 - Rad
;
XOR A
LD (DBCXVAR),A ... /> SUB E
JP C,DBCDONE ; while y > ... SUB E
LD C,A
LD A,(DBCYVAR ... SUB E
LD C,A
LD A,( ... SUB E
LD C,A
LD 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…
... /> djnz attr1 ;
fl_bus:
xor a ;
ld a,5 ... ;
inc h ;
jp c,e1 ; if not over line ...im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.
... = sprite length
ld c, l
ld b, h ... sprite
lace_loop:
xor a
DUP 4 ... /> dec bc
ld a, c
or b
jr ...im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.
... address, DE = mask address
; C = sprite pixheight
;
; ... ld c, a
rotator
or c
ld c, a ; C = ... (de) ; mask byte
cpl ; xor #FF
and mask
im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.
... vertical flip bit
ld c, a ; C = cellheight
inc hl ... a, (hl) ; A = cellwidth
xor %10000000 ; inverse horizontal flip bit ... /> ld a, (de)
ld c, (hl)
; ------------------
; ...Useful Hacks and Alterations ArchiveBeyond infinite lives and 'cracked' games (which I don't like much) there are several really useful hacks of Spectrum games that make them - more pl…
... routine
...
e9f9 xor a
ld (ea47),a ... = down
in a,(c)
and 01
... = right
in a,(c)
and 01
... = fire
in a,(c)
and 01
... ; write up/down status to c
jp dee7 ; jump ...Pseudocode for CIRCLE algorithm?Can anyone provide me with the pseudocode for the Spectrum's CIRCLE algorithm? My machine code knowledge isn't up to reading the ROM routine. I'm try…
... = 1 - Rad
;
XOR A
LD (DBCXVAR),A ... /> SUB E
JP C,DBCDONE ; while y > ... SUB E
LD C,A
LD A,(DBCYVAR ... SUB E
LD C,A
LD A,( ... SUB E
LD C,A
LD A,( ...
