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Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... ]Column coordinates within the Spectrum screen always respect the 256 bytes ... was making operations on linear screen buffer in memory. I didn't ... bytes actually copied to real screen
N - are not ... directly copied to screen but deliver bits to S ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... exx
pop hl
pop de
pop bc
rla
push hl
pop hl
;exx
... inc sp ;can't do "pop bc"
inc sp ; as ... -
Hardware description - DivIDE interface[B][U]DIVIDE interface / DivIDE 2k11[/U][/B] [B][U]The main description[/U][/B] DIVIDE is IDE interface with own external memory. Thanks to very goo…
... ,r3
pop af
push bc
ld bc,$a3
jr ... : inir
inir
r5: pop bc
djnz rx
r6 ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... right 2 pixels
pop hl
pop de
rr l ... br /> exx
pop hl
pop de
pop bc
rla
push hl
pop hl
xor a
... -
MC LPRINT 23681Having problems with this routine to print large on the screen using LPRINT, it works ok in BASIC, but cant seem to get it to loop for some reason in…
... around with spaces and the BC register within the print routine ... print ;call print routine
pop bc
LD A,C ... /> ld de,dat
ld bc,9
LD HL,23680 ... -
MC LPRINT 23681Having problems with this routine to print large on the screen using LPRINT, it works ok in BASIC, but cant seem to get it to loop for some reason in…
... /> ld l,8
ld bc,$4800 ;B=72,C=0 ... /> LOOP1: push bc
ld (23680),bc
ld bc,16
ld ... print a string length BC from DE
pop bc
inc b ... -
Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... to, you could push af, pop bc then examine the relevant bits ... or de in place of bc, and examine 'l' or 'e ... -
Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... to, you could push af, pop bc then examine the relevant bits ... or de in place of bc, and examine 'l' or 'e ... -
Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…
... hl
835e c5 push bc
835f cd7985 call StrengthSubtract ... StrengthSubtract
837a c1 pop bc
837b e1 pop hl
837c ... -
Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…
... call PWindowR4
8598 f1 pop af
8599 ee10 xor ... PWindowL5 ; pwlf
85bf f1 pop af
85c0 ee10 xor ... xor $10
85c6 c1 pop bc
85c7 10eb djnz StrengthSubtract1 ... -
Poke 23755 & 23756Entering the following few lines of BASIC: [IMG][URL=http://s1286.photobucket.com/user/rebelstarwac/media/Poke1_zpsc2845838.png.html][IMG]http://i12…
... /> The 128k editor maintains a screen buffer which is what is shown ... on the screen. When it does a relist ... up the rest of the buffer with as many following lines ... doesn't have an editor screen buffer as it uses a line ... -
Another vertical scrolling questionwhile talking about w256 x h128 vertical scrolling, are 128k modes have any advantages over 48k models? has extra ram or swappable screen buffer any…
... /> has extra ram or swappable screen buffer any use on scrolling?[/QUOTE ... advantage due most issues with screen sync are gone. And it ... 49152 and draw it to screen swapped off than trying to ... -
Bug in Super Wonder Boy in Monsterland?Hello!:smile: This game seems to have a bug that prevents finalize. The dragon that is in the last level, it is impossible to kill.Remains static.No…
...
push de
push bc
ld a,#1c
#bd48 pop bc
pop de
#bd4a pop af
add ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... routine but our data (a screen buffer for example) are a "part ... awkward work with such a buffer separated by LD HL,NN ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... pop hl
pop de
pop bc
exx
pop hl
pop ... de
pop bc
pop ... /> push af
push bc
push de
... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... keypress
pop bc ; unstack BC
pop de ; unstack DE
pop af ; ... unstack AF
pop ... /> nmi_ret:
pop af ; unstack AF
pop hl ; unstack HL ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... de, hl ; restore pointer
pop bc ; unstack new variable name
me_ent_3:
pop bc ; unstack length
pop de ; unstack prog
pop hl ; unstack new pointer
pop bc ; unstack length ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... this to copy off-screen buffer onto the screen. This is why people ... used "nonlinear" off-screen buffers. This approach can easily ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... /> POP HL
POP DE
POP BC
EXX
POP HL
POP DE ...
POP BC
POP ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... bytes right until done
pop bc ; unstack BC
ret nc ; return ... 0x30be
hl_end:
pop bc ; unstack BC
ret ; end of subroutine ... ; main register set
pop bc ; DE' to BC
ld a, b ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... register set
pop bc ; unstack exponent bytes
pop hl ; unstack pointer ... so
pop af ; unstack priority marker
ld bc, 0x107c ; ... org 0x32d4
oct_to_dec:
pop af ; unstack priority marker
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... 0x2734
s_loop:
pop de ; get last op- ... 0x2764
s_runtest:
pop de ; unstack last op- ... 0x2770
s_endloop:
pop bc ; unstack present values
... br /> s_next:
push bc ; stack present values
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... * dimension size
pop bc ; unstack variable pointer
bc ; stack BC
call test_5_sp ; room for five bytes?
pop bc ; unstack BC ... pop bc ; unstack length
pop hl ; unstack pointer
inc bc ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> pop bc ; length
push bc ; to BC
inc bc ; ... reclaim existing array
pop bc ; unstack discriminator byte
... pop bc ; unstack length
dec bc ; decrease
dec bc ; by
dec bc ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... bc, 5 ; 5 bytes
call test_room ; test for space
pop ... /> exx ; alternate register set
pop hl ; unstack next literal to ... A
pop hl ; unstack HL
pop bc ; unstack BC
ret nz ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... 0x35b5
secnd_low:
pop bc ; unstack BC
jr z, both_null ... br /> frst_less:
pop bc ; unstack BC
pop af ; unstack AF< ... /> other_str:
pop bc ; unstack second
pop hl ; string parameters ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... 're feeling loony, use I: pop bc, ld A,B, LD I ... ,A, LD A,C, pop BC to make flag register clear ...IF EXIST?In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not. There are any way to check it out from BA…
... /> di
ld bc,32765 ;BC=$7FFD, I/O flags address ... ld c,a
push bc
;restore BASIC ...
ei
pop bc ;restore status
ret ;return ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... /> POP DE
POP BC
EXX
POP HL
POP DE
POP BC
POP ... /> POP DE
POP BC
EXX
POP HL
POP DE
POP BC
POP ...
