-
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 …
A lot of the code mentioned ... bad for speed. Here's a very small piece of code ... to wait until a key is pressed which doesn ... ]
_WAITFORNOKEYS
xor a
in a, ($fe)
cpl
and %00011111 ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
[QUOTE=bobs;348510]A lot of the code ... for speed. Here's a very small piece of code ... to wait until a key is pressed which ... ]
_WAITFORNOKEYS
xor a
in a, ($fe)
cpl
and % ... I can see this being a real pain for bigger ... -
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 …
... 's a good point - just about everything in my post needs a good ... keyboard (QWERT, ASDEF etc)
in a, ($fe)
; Invert each bit of ... important as only five keys in a section.
and %00011111
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... your explanation! Just in case I still have ... are in my semi-confused state :)
A ... overwrite it with [COLOR=Blue]IN A, ($FE)[/COLOR] ?
... [B]EDIT[/B]: A bit more research indicates that ... the accumulator are put in the high order ...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 …
...
Often in games you need to display a screen after some ... which might others who are in my semi-confused state :)[/ ... overwrite it with IN A, ($FE) ?[/QUOTE]
On a spectrum, ports ... call itself. So in clearing A, and then using $FE, the port ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... =szeliga;348536]
A quick question though: why ... it with IN A, ($FE) ?[/QUOTE]
IN A,($FE) places $FE on the ... the contents of the A register goes on the ... the port read. Port $FE selects the keyboard and ... is being read. Since A=0, the top 8 ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
[QUOTE=bobs;348510]A lot of the code mentioned ... bad for speed. Here's a very small piece of code ... to wait until a key is pressed which doesn ... ]
_WAITFORNOKEYS
xor a
in a, ($fe)
cpl
and %00011111 ...+3 Centronics port: How does it work?I've been trying to follow the code with Fuse's debugger and I can't see it writing anywhere except to port 0x1ffd. It also jumps through some fairly…
... busy bit
221d ed78 in a,(c)
221f cb47 bit ... /> 2c6b 3e7f ld a,#7f
2c6d dbfe in a,(#fe)
2c6f 1f ... /> 2c71 3efe ld a,#fe
2c73 dbfe in a,(#fe)
2c75 1f rra ...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 …
... ; Save return state
LD A,(BORDCR) ; Get border colour
RRCA
OUT (&FE),A ; Set border colour
POP ... error
LD A,&7F
IN A,(&FE) ; Scan B-SPACE ...Creating a Spectrum game that won't load...Dear All, I have recently been using my ZX Spectrum as a reference for the production of a new body of art work and something I keep coming back to …
... SALEAD DJNZ SALEAD
OUT ($FE),A
XOR %00011111 ;toggle between ...
OUT ($FE),A
LD A,%00001101 ;MIC off, brd ... B,$31
LD A,$7F
IN A,($FE)
RRA
... RET NC
LD A,D
INC A ...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…
... row 'P-Y'
IN A, ($FE) ;
BIT 0, A ; Test for 'P ... A, $FD ; Keyboard row 'A-G'
IN A, ($FE) ;
BIT 0, A ; Test for 'A ... row 'SPACE-B'
IN A, ($FE) ;
BIT 0, A ; Test for 'SPACE ...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 ' ... ld a, $df ;
in a, ($fe) ;
bit 0, 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]
ld a, $df ; 7 (7)
in a, ($fe) ; 11 (18) ; ... /> [/code]
So that 'a' = 1,2,4,8 or ... de and b. Loading b in the keystates with the low ... byte of a table, which holds the low ... . This also doubles as a check to see if the ...zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…
... with it but there are a few (obviously with their own ... than you're anticipating. "XOR A : IN A,($FE) : AND $1F ..." and variations thereof ...zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…
... than you're anticipating. "XOR A : IN A,($FE) : AND $1F ..." and variations thereof ... is not going to remain in it's present state, infact ... ZXS has only been in development for a few weeks and is ... written Z80 core. It is in this area that I really ...Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …
... is PreCalculated & now Stored in M3
; M0 seems ... />
CheckKey:
xor a
in a, ($fe)
cpl
and %00011111 ... /> ; Assembled Duration = INT(Basic duration in Sec / (1/51) )
; ...Using Interface II joystick in kempston-only gamesHi everyone! It's me again, bothering you with new crazy ideas :) I have recently acquired an Amstrad +2A Speccy with a joystick and built-in Interf…
... some luck to find a solution to my first ... for read joystick port - XOR A,IN A,(1F)
-replace this ... PUSH AF
LD A,EF
IN A,(FE)
CPL
... POP AF
LD A,E
POP DE
in register A emulated kempston joystick state.Games hacked to be played with Sinclair Joystick #1 (67890)I have mentioned a few of these in other threads, but I think they kinda deserve their own... I have been hacking a few of my favorite games which ha…
... always use IN instructions on port $FE, something like ... (they could use any other IN instruction, not just IN A ... ,(NN)):
LD A ... , $DF ; Keyboard row 'P-Y'
IN A, ($FE ...Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …
... on all entry points used in DIVIDE.
adress #0000 ... HL,#1F80
adress #0562: IN A,(FE)
Some modified 48roms ...Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …
... on all entry points used in DIVIDE.
adress #0000 ... HL,#1F80
adress #0562: IN A,(FE)
Some modified 48roms ...Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…
... ; it still crashed after a few iterations using WinZ80. ... worked all the time in Fuse I presumed that ... /> Anyhoo, I've experimented a bit more with WinZ80 and ... 23
in a, ($fe) ; 7f62 db fe
bit 6, a ; 7f64 ...Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…
... 23
in a, ($fe) ; 7f62 db fe
bit 6, a ; 7f64 cb 77 ... Ear bit is bit 4 in 0xfe. The mic bit is ... you're sampling bit 6 in the above code.Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…
... you're sampling bit 6 in the above code.[/QUOTE]
FE; bit 6 of IN-port FE is the EAR ...
L_7F5E: IN A, ($FE) ; 7F5E DB FE
BIT 6, A ; 7F60 CB 77 ... use for the returned value in BC), so the loop limit ...Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…
... port $7FFE with LD A,$7F / IN A,($FE). On checking the Z80 ... bus to the current value in A and the low order ... to the value n from IN A,(n), so the two ... A, $7F ; 7F5E 3E 7F
IN A, ($FE) ; 7F60 DB FE
BIT 6, A ...Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…
... : LD A, $7F ; 3E 7F
IN A, ($FE) ; DB FE
BIT 6, A ; CB ... , disabling IRQs while in a timing loop is essential in order to have ... a more constant loop time ...Zombie Zombie Loading SchemeA quick check of the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0005866"]Zombie Zombie[/URL] loader identifies it's the RAPID LOADING SYS…
... $07ts
out ($fe), a ; 5d74 d3 fe $0bts
ld hl ... 04ts
out ($fe), a ; 5d85 d3 fe $0bts
ld a, $7f ; 5d87 ... 3e 7f $07ts
in a, ($fe) ; 5d89 db fe $0bts
l_5d8b: ... l_5dcc: jr l_5dcc ; 5dcc 18 fe $0cts
l_5dce: defm " ...Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
...
; ******************************
xor a ; 4t - a=0
in a,($FE) ; 11t - read all keyboard ... ; 4t - next mem
in a,($FE) ; 11t - read in the keyboard half row ...
