-
Timex 80 column display driverI subsequently wrote an 80 column font driver for 512x192 mode.
... />
.xoutofrange
xor a
ld (xcoord),a ... br /> jr c, yok
xor a
.yok< ... jp (ix)
.col0 ; shift right 0 pixels
ld a,#20
xor h
ld h,a ... -
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…
... d = max 1 keypress
xor a ; a = current key ... ret
ExitNoKeySet: xor a
ret
SHIFT and SYMBOL SHIFT
defb ... -
tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... bits are already set
xor $85
rrca
rrca ... />
ld e,l ; now shift attributes
ld d,h ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... the number of pixels to shift the mountain right within the ... wide, anything larger than a shift of 16 pixels would draw ... . The number of pixels to shift the graphic right within the ... />
[code]
// bit 6 = xor flash in plot
Bubble Bobble EditI thought I might have a go at editing Bubble Bobble myself after reading this... [url]http://www.worldofspectrum.org/forums/showthread.php?t=15452[…
... nz,#82df ;not yet
xor a ;yes we are level ... /> ld (hl),0
rla ;shift bit 7 into carry
rl (hl) ;and shift into 860c
;(is it ...ANNOUNCE: BASin r14 is up. New SCREEN$ paintbox included.Hi all, Well, I can't sit on this any longer - so I've released it. Let's all get a good testing session going, eh? You can get the new BASin [url=…
... selection unless you add/subtract/xor with the current. If it ... using CTRL as a symbol-shift would get in the way ...Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... and 8 cycle variety of shift compared to "rla" which gets ... -byte 4 cycle variety of shift.
In the LFSR ... calculation, you do a "XOR A; RR D" at the ...Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... and 8 cycle variety of shift compared to "rla" which gets ... -byte 4 cycle variety of shift.
In the LFSR ... calculation, you do a "XOR A; RR D" at the ...Help with hi-res 40 column fontI have created a 12x8 pixel font for use with Timex hi-res (Mode 6).
... around this would be to XOR the msb of the display ... /byte routine would have to shift everything 4 bits to the ...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
A combination of R register, Shift and Xor usually does the trick
LD HL,seed
LD B,(HL)
LD A,R
RLA
XOR B
LD (HL),A
something as simple as this may do the trick...or maybe not...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... I don't think xor and shift is any worse than the ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... SaveRamtopValue
Detected_48K
XOR A ; Set 48K RAMTOP value ... charcater
ADD A,A ;Shift A leftwards
DJNZ ...
LD A,B
XOR C
LD (FailedBits),A ...+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…
...
ld bc,0x1ffd ;
xor a ; clear bit 4 when ... /> ld a,0xfe ; test for shift
in a,(0xfe) ;
The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…
... the file menu, press caps shift and T to open a ... project...
[code].calc_checksum
xor (hl) ; merge data byte into ...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…
... nicely.. the [B][I]paradigm shift[/I][/B] in computer programming ... LOTS OF TIMES
;
xor a
ld (5C3Ch),a ... example or [i]why[/i] XOR A is the same as ...How to insert special characters in Basic and ASM ?Look the next picture. [IMG]http://img25.imageshack.us/img25/9479/scode.jpg[/IMG] I dont know how to insert these black and diagonal characters. No…
... . 8 bytes in memory
xor a ;first line into A ... the horizontal line
rra ;shift A to the right, inserting ...How to insert special characters in Basic and ASM ?Look the next picture. [IMG]http://img25.imageshack.us/img25/9479/scode.jpg[/IMG] I dont know how to insert these black and diagonal characters. No…
... . 8 bytes in memory
xor a ;first line into A ... the horizontal line
rra ;shift A to the right, inserting ...How to insert special characters in Basic and ASM ?Look the next picture. [IMG]http://img25.imageshack.us/img25/9479/scode.jpg[/IMG] I dont know how to insert these black and diagonal characters. No…
... 8 bytes in memory
xor a ;first line into A ... the horizontal line
rla ;shift A to the right, inserting ... 8 bytes in memory
xor a ;first line into A ... the horizontal line
rla ;shift A to the right, inserting ...How to insert special characters in Basic and ASM ?Look the next picture. [IMG]http://img25.imageshack.us/img25/9479/scode.jpg[/IMG] I dont know how to insert these black and diagonal characters. No…
... . 8 bytes in memory
xor a ;first line into A ... the horizontal line
rla ;shift A to the right, inserting ...Sprite RotatingI was looking (actually at Everyone's a Wally), and noticed that all the graphics for the main characters are left facing, and two characters wide. …
... either, just the core Shift\Rotate equivalent, but if ... of sprite is unmirrored
xor a
loop
... /> ld d, mirror_table
xor a
loop
ld ... combinations are
shift 0px ... do nothing
shift 2px ... call 2 ...Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…
... for nr of bits
XOR A ;clear A and C ... /> ;-------
div1 ADD HL,HL ;shift dividend 1 to left,
shift a valid bit into oblivion ...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) …
... two generators mixed together through XOR, which allows to get different ... frequency, but with phase shift, the phase shift defines width of the ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... />
; Draw all sprites using XOR method.
draw_sprites ... /> call xor_sprite ; Now print (XOR will print/unprint)
ret ... /> ; 254 V C X Z SHIFT
; 253 G F D ... high and low
xor a,(hl) ; XOR with screen
ld ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... />
; Draw all sprites using XOR method.
draw_sprites ... /> call xor_sprite ; Now print (XOR will print/unprint)
ret ... /> ; 254 V C X Z SHIFT
; 253 G F D ... high and low
xor a,(hl) ; XOR with screen
ld ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... />
; Draw all sprites using XOR method.
... /> call xor_sprite ; Now print (XOR will print/unprint)
ret ... /> ; 254 V C X Z SHIFT
; 253 G F D ... both high and low
xor (hl) ; XOR with screen
ld ...Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …
... ).
[QUOTE]3. A shift from algoritm-driven code (ie ... I simply want to shift many sprites in xor-mode for pure ...yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... " rather than "cp 0" and "xor a" rather than "ld a ... in order to catch one shift with one key. If the ... would suggest that caps+sym shift should be tested outside the ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... store it in col
xor a ; set a to ... ret
err_b:
xor a ; set a to zero ... br />
do_cr:
xor a ; set A to zero ... jr nz, zend ;
xor a ; reset if so
rrca ; shift right
rrca ; four ...
