-
Keyboard Issues When Setting Border ColourWelcome to the next in my series of inane 'Z80 on the Spectrum' questions! ;) Here's a minimal snippet of code for polling the keyboard until any ke…
... NOKEY: LD A,0
IN A,($FE)
CPL
OR A
... /> [CODE]
LD A,0
OUT ($FE),A[/CODE]
OUT ($FE),A
NOKEY: LD A,0
IN A,($FE)
CPL ...
OR A
... -
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…
... />
[code]keys: ld a, $df ;
in a, ($fe) ;
bit ... 0, a ; Test for 'p' key ...
bit 1, a ; Test for 'o' key
in one of 3 positions, ... -
AZIMUT / Frecuency spectrum[code]start DI LD HL,#7F40 LD D,#58 loop LD B,#00 bucle1 LD A,H IN A,[#FE] XOR A,C AND A,L J…
... br /> bucle1 LD A,H
IN A,[#FE]
XOR A,C
AND ... br /> bucle2 LD A,H
IN A,[#FE]
XOR A,C
AND ... C,#00
LD A,H
IN A,[#FE]
RRA
... -
Speccy machine code info where is it?Recently I've been trying to learn Z80 and I've managed to make limited progress (some of my routines even compile now!) but I seem to be having trou…
... br /> ld a,0111 1111 ; row #7 active
in a,($fe) ; read ... keyboard
; a = status of keys ... br /> ld bc,$7ffe
in a,(c)
- The ... display file represents 8 pixels in a particular column.
< ... -
ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…
... that gets a bit from the casette in zx81 rom, ... ; decrement the measuring timer.
IN A,($FE) ; read the
RLA ... BIT 7,E ;
LD A,E ;
JR C, ... -
Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... /> ld d,$fe ; d = max 1 keypress
xor a ; a = current key ... />
ld a,$fe ; check on CAPS key
in a,($fe)
and 1 ... ; check on SYM SHIFT
in a,($fe)
and 2
jr ... -
IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…
... they're reading from port FE?
[/quote]
Sorry ... make this check for port FE.
Well, the ROM ... read from port +7FFE
IN A,(+FE) i.e. BREAK and EAR ... EAR everytime there is an IN from FE no matter what the ... -
Saboteur - Safe or secret place?Hello. Im sure many of you played Saboteur. When you are on the 1st floor (the floor you start), you can see a blocked ladder on a screen just before…
... br /> ld a,$fb
in a,($fe)
bit 0,a
jp ... br /> ld a,$fd
in a,($fe)
bit 0,a
jp ... br />
ld a,$df
in a,($fe)
bit ... -
Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…
... /> I'll be interested in your results.
[/quote ... #1: OLDSP is a label for a DEFW
NOTE ... full src code, in case someone what to ... option --tzxbas, and testing in spectaculator 5.0
...
LD A,#FE
IN A,(#FE)
RRA
JP ... -
Capture Routine HelpData: ORG 32768 [ This Message was edited by: dalmudlee on 2005-08-10 01:57 ]
...
JR Z,J1
IN A,($FE)
RLCA
JR NC ...
JR Z,J1
IN A,(#FE)
RLCA
JR C ... /> [/code]
(Edit: using $ in the forum produces strange results ... -
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 d,$fe ; d = max 1 keypress
xor a ; a = current key ... />
ld a,$fe ; check on CAPS key
in a,($fe)
and 1 ... ; check on SYM SHIFT
in a,($fe)
and 2
jr ... -
Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …
... you want to read the 'a' key.
[code ... ; Get the key row
IN A,($FE) ; Read the 'keypress'
... BIT 0,A ; Test for the 'a' key
JP ... I wanna tell you a story 'bout a woman I know...
Key press to ASCII valueI need a bit of code that will give me an ASCII value when the key is pressed. I only really need a-z. I tried using the following code but it only s…
... />
ld a,$fe ; check on CAPS key
in a,($fe)
and 1 ... ; check on SYM SHIFT
in a,($fe)
and 2
jp ...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…
... ; check on SYM SHIFT
in a,($fe)
and 2
jp ... ; check on SYM SHIFT
in a,($fe)
and 2
jp ...Loading schemes18 years ago I hated loading schemes like Alcatraz and Speedlock because they were a b*tch to copy and became unreliable when the tape got older. Now…
... di
ld a,$08
out ($fe),a
ld hl ...
push hl
in a,($fe)
rra
and ... ret z
ld a,$7f
in a,($fe)
rra
...Spectrum audio signallingI've had a poke around in some of the docs (and my Z80 assembler-fu is so rusty it'll be a while before I grok the Complete Spectrum ROM disassembly)…
... />
[code]
LD A,#7F
IN A,(#FE)
[/code]
a pulse present, and 1 when ... pulse to 'silence'. This is a Good Thing.
Of ...Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
... ; (-20)
l8c51: xor a
in a,(#fe)
cpl
and #1f ... br /> xor b
sbc a,a
sub (hl)
adc ... 1 ; (3)
add a,a
adc a,c
l8ceb:
a
adc a,l
add a,c
adc a,l ...NEW games for you chaps (and girls too) ;-)Okie, did some .TAP versions of NEW original games that were only released on TRDOS disk format. Some of you might have seen some (one or two are eve…
...
wait: LD A,$7f
IN A,($FE)
RRA
JP ... B is number of sectors in trdos, one sector = 256 ... br /> JP $556 ; load in the headerless block
A LOT of free space to put your own tape loader in ... .
A lot of the ...New Game - JustinA new isometric 3D Game for ZX Spectrum, Justin: [url]http://cpce.emuunlim.com/justin.tap.zip[/url] It can be played in spanish and english languaj…
... of putting it into a magazine-style type-in hack (the CALLs ... game code
keypress:
IN A,($FE) ;get keyboard
AND $01 ... A,B ;put B into A
OUT ($FE),A ;send B to port $FE ...
LD A,B ;put B into A
OUT ($FE),A ;reset border ...How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... $xxFE
inc hl
in a,($fe)
and (hl) ; select which ... key in row to pay attention to ... keys with one IN instruction and save yourself a few tens of ... there is almost zero difference in execution speed.
[ ...Splitting Images tzx maybe not perfectI've been hacking this game and its loader. Also the save routine is intact in this game. It saves a block with a pilot length of 801 pulses. Test…
... /> di
ld a, $0f
out ($fe), a
in a, ($fe)
rra
ret z
ld a, $7f
in a, ($fe)
rra
xor ... b, $31
ld a, $7f
in a, ($fe)
rra
ret ...DarkStar.tzx in Spectaculator 6.25Hi all I think I have found a bug in Spectaculator. Darkstar.tzx(OriginalRelease) wiil not not load. DarkStar.tap loads The DarkStar Re-release t…
... happily stand corrected for a better explanation which I ... error in the loader is here: $fc7d (set a breakpoint ... clears the EAR bit in C. This is okay ... the actual data coming in (since it misses the ... 7F LD A,$7F
FD2C DB FE IN A,($FE)
...New (easier) speccy games testI've created a new speccy games test: [url]http://www.sometests.com/tests/Gaming/ZXSpectrumGamesTest_EasierVersion_.html[/url] Again it's 20 questi…
... see it all before in a previous game. Taking the ... ; it is "optimised" in Knight Lore onwards. To ... to a port and then read in from a port. In ... pentagram, etc), they use it in a subroutine.
A
IN A,(#FE)
BIT 0,A
RET ...New (easier) speccy games testI've created a new speccy games test: [url]http://www.sometests.com/tests/Gaming/ZXSpectrumGamesTest_EasierVersion_.html[/url] Again it's 20 questi…
... out a byte and then read it in to ... OUT (#FD),A
IN A,(#FE)
BIT 0,A
RET ... will be significant differences in the draw code between ... in the game... oh and in the menu... oh and wait for a ... with a decent keyboard reading routine sometime in its ...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... going to get overwritten by IN A, (0xFE) - why are they setting ... ]
Wiith IN A,(value) and OUT (value),A, it uses the ... /> So LD A, &7F : IN A,(&FE) acts effectively as IN A,(&7FFE ... the 16 bit address when IN x,(C) and OUT (C ...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... /> So LD A, &7F : IN A,(&FE) acts effectively as IN A,(&7FFE ... of the address bus for IN/OUT instructions. (Slaps head ...Was Knight Lore Really Written Before Sabre Wulf?Was Knight Lore really written before Sabre Wulf or was this a clever form of self promotion by the Stamper brothers? It was a great piece of journa…
... see it all before in a previous game. Taking the ... ; it is "optimised" in Knight Lore onwards. To ... to a port and then read in from a port. In ... pentagram, etc), they use it in a subroutine.
... OUT (#FD),A
IN A,(#FE)
BIT 0,A
RET ...VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
... true - I did that in the Galaksija emulator, but ... probably saves less than a second in the 2-3 ... abort the keyscan if XOR A; IN A,($FE) ; CPL; AND $1F ... ll be including this fix in the next release then ... also include this improvement in the UK101 emulator as ...VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
... abort the keyscan if XOR A; IN A,($FE) ; CPL; AND $1F returns ... t expecting such an increase in speed (>10%).[/quote]
In particular, replacing the key scanning ... that uses keyboard control takes a large speed hit from the ...Help: OUT (port), A[deleted]
... the port... examples (using IN) show ports as having ... /> There is no connection in the code used. OUT ... whereas OUT (port),A/IN A,(port) as in the example uses the ... />
OUT (BC)/IN (BC) uses the BC register ... 8 bits. So, LD A,7F:IN A,(FE) reads from 7FFE, ...
