-
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... inc hl ; next byte
jr .loop
[/code]
< ... 2 bytes and requires 7 T-states. AND A requires 1 ... byte and takes 4 T-states. What AND A does ... 4 T-states, instead of 2 bytes and 7 T-states for ... that you (eventually) won't be able to live ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... right away, and it won't bugger it up if it ... a
and a
jr nz,loop
;
dec hl ...
and a
jr nz,loop2
ld a,l ...
and a
jr nz,loop2
ret
... z
rst 10h
jr WrtMsg
[/CODE]
... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... call to 6683 doesn't destroy the BC pair ... flag[/COLOR][/B]
jr nz,loop
;
or l
jr nz,loop2[/B]
t be long before you ... faster! What, you don't believe me?! Just wait and ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... to make sure you don't lose your original source code ... br /> out (254),a
jr nz,loop
;
dec hl ... ,h
or l
jr nz,loop2
ret
;
t come natural... it ain't intuitive.. at least ... -
What are the keys for Penetrator?Q - Up, A- Down, O-Left P- Right Space - Bomb. So what's fire? When I press the P button, it fires bullets, but that's the 'right' key. Surely they…
... br /> ; $FB = Q to T
; $F7 = 1 to ... for 'P' key
JR NZ, KEY_L ; Jump if not ... A, $FB ; Keyboard row 'Q-T'
IN A, ($FE) ... for 'Q' key
JR NZ, K_BOMB ; Jump if not pressed ... for 'SPACE' key
JR NZ, K_FIRE ; Jump if not pressed ... -
Anybody got a hack for PAW'd games?Has anybody got a hack to browse the text in PAW'd games?
...
cp $a5
jr nc, token
cp $20 ... h
or l
jr nz, aaa
ret
...
cp $80
jr nc, fff
... rst $10
jr ddd
fff sub ... 80
rst $10
jr bbb
... -
Bit functions speedI just stared nonplussed at the documentation for the bit functions. Apparently, if you're using the accumulator, using AND and OR is faster than se…
... imm, OR imm take 7 T states, if this documentation is right ... /> The one tip I didn't figure out for myself (and ...
or c
jp nz, loop
[/code]
Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …
... complained that he couldn't use my compiled .TAP ... br />
I didn't change much: Loop2 now reads ... viewer_loop2
cp 'Q'
jr nz, viewer_loop3
ld a, ( ... EDITED: Added (was previous)
jr viewer_loop6
viewer_loop3
...Help fix this keyboard read program?This code runs in an interrupt routine with DI. What would be the simplest way of making it so it doesn't auto repeat a keypress? [code]keys: ld a…
... making it so it doesn't auto repeat a keypress?
jr z, moveright
bit ... ; Test for 'o' key
jr z, moveleft ; Jump if pressed ... ; Test for 'p' key
jr Nz, releaseright
[/code]Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... the dirtybuffer, which I don't touch in the ISR). ... .beepdelay
dec c
jr nz, .beep
.nosfx
... br /> ld (tune_tick), a
jr nz, .skipnote
ld a, ( ... .tuneloop
dec c
jr nz, .tuneloop
.skipnote
...Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …
...
ld a,c
jr nz, encoderight
cpl ; encode a ... ; de = parent.left+1
jr nz, foundchild
ld a,(de ... C. Of course I don't know how it all works ... dictionary compressions since I didn't think it would work too ...Midi2ayhello, Does anyone know how to use MIDI2AY ? FABIEN
... your interested, and don't mind compiling stuff with Pasmo ... br /> ;; 48k ONLY - won't work in 128k ; Use PASMO ... )
or a
jr nz,finrsi
inc hl
cp 0ffh
jr z,fin
cp 0feh ... a
inc hl
jr bucle
finrsi
...Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... ; fire button pressed?
JR Z, xxx ; start game with ... ; any key pressed?
JR NZ, xxy ; start game with keyboard ... If the Kempston interface isn't connected, the floating bus will ... 31
which won't trigger the proposed game-starting ...Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... ; fire button pressed?
JR Z, xxx ; start game with ... ; any key pressed?
JR NZ, xxy ; start game with keyboard ... If the Kempston interface isn't connected, the floating bus will ... 31
which won't trigger the proposed game-starting ...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 …
... Print routine that doesn't rely on ROM calls ... of text that don't span lines then there' ... at the end
jr nz,p_start ;of a line. ...
and 31
jr nz,p_start
ld c,a ... b
inc b
jr p_start
;
p_print: ...FMV on +3eOK, so about 6 months ago i posted here that i got full motion video on +3e, with a bunch of scr files called passion. I added the glider rider music…
... for 8bit sample. I didn't try it in real, please ... /> deloop:
dec a
jr nz,deloop
cpi
jp ...Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…
... T
inc bc ; 6 T
jr loop ; 12 T
; 25 T-states ... (24+32) = 56 T-states, as opposed to 50 T for non-contended ...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…
... /> ret
;don't print character if > 191 ... br /> dec d
jr nz,p_print2
;Rotate the ... br /> and 31
jr z,p_print4
;Increment ... br /> dec a
jr nz,p_print0
;get the ... write if we haven't reached the end yet ...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. …
... (ix),a ;one item (can't be less), we'll count ... , don't move
dec (hl) ;move up otherwise
jr showCursor ... ;if 'cursor down' key
jr nz,.loop1
ld a,(itemsAll ... , don't move
inc (hl) ;move down otherwise
jr showCursor ...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…
... b
cp 200
jr nz,loop1
ret
; ... /> ret
;don't print character if > 191 ... br /> dec d
jr nz,p_print2
;Rotate the ... br /> dec a
jr nz,p_print0
;get the ... write if we haven't reached the end yet ...Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…
... have become stuck with the JR NZ instruction. My little test program ... FFh
DEC BC
JR NZ,F9h
RET[/FONT][/INDENT ... seems that [FONT="Courier New"]JR NZ[/FONT] is not recognising the ... missing something? My book simply states that it will branch to ...Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…
... Decrement counter 3 15
JR NZ,LOOP ; Loop back -6 bytes ... ; Decrement counter 2 0D
JR NZ,LOOP ; Loop back 20F1
JR NZ,LOOP ; Loop back 20E5
t mind, you are learning... the ...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…
... signature.
It doesn't eat much.
t play your sna ... white ink + bright
jr putcol1
whitekey1 ...
dec c
jr nz, loop1
ld ...
dec c
jr nz, loop2
ret ...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…
... occasional, and I wasn't intially sure whether it was ... + WHITE INK + BRIGHT
JR PUTCOL1
WHITEKEY1: ... />
DEC C
JR NZ, LOOP1
LD C ... />
DEC C
JR NZ, LOOP2
NEXTPIXEL: ...Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…
... your example you probably won't need to explicitly clear the ... . *Just make sure you don't need to worry about the ... 's auto DEC B & JR instruction - which is:
[code]DEC B
JR NZ,LOOP1[/code]
Z80 ...IF and control flow in machine codeHi everyone, Basic has a nice control flow like if statements. How can these be done in machine code since i cant find anything thanks
... actual value in A doesn't really change.
Anyway ... these flags with commands like JR Z, JR NZ, JP NC, etc.
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…
... /> PRINT t;":Finish : ";ft't;":Duration : ";ft-st:
LET t(t)=ft-st ... ) ;A=l$ cp (hl)=v$(t)
jr c,NEXTS1
NEXTS2: dec b
jr nz,FORS
ld a,1 ...logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…
... as BASIC doesn't evaluate expressions within ... is not ":"
jr nz,Exit ;then, exit. It ... then exit.
jr nz,Exit
rst ... If not...
jr nz,Exit
rst 20h ...The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …
... than Z80 but it doesn't hurt to have a working ... 'bank' directive but I don't know how to use it ... ,(254)
and 1
jr nz,$loop
jp zx232 ...
