-
Struggling with this routine... Any ideas?I'm trying to write a routine that plots 3 pixels to decrease the energy bar in the top right corner by 5 units, but it just wont have it! There mus…
... clears the Screen and sets ATTRIBUTES to the value given in ... br /> ld a,(de)
xor l
and h
xor l
ld (de),a ... br /> ld (ATT),a
xor a
SET MASK TO ... ?0? using the classic ?XOR A?
ld (MASK),a ... -
generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…
... /> This one is doing the attributes 1 bit at a time ... />
ld a,l
xor $2d
ld l,a ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... />
LD A,E
XOR L
AND 7
XOR L with NOPs. So the ... /> CALL 85E4
;; load attributes into screen RAM, forwards, without ... to, say, load the screen attributes into high memory somewhere, blit ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... wrong position just before copying attributes.
Your routine can ... /> loop ld a,h
xor l
and $F8
ld d,a
xor h
xor l
rlca
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... E6F8 and $f8
A9 xor c
57 ld d ... looks different since it copies attributes first:
[CODE]; ... loop: ld a,b
xor c
and $f8
ld d,a
xor b
xor c
rlca
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... looks different since it copies attributes first:
[CODE]; HL ... /> loop: ld a,b
xor c
and $f8
ld d,a
xor b
xor c
rlca
Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... posted flip screen with attributes routine. Moved LD ... rrca ;a=GHABCDEF
xor c
and %10101010 ... rrca ;a=CFEHGBAD
xor c
and %01100110 ...display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... ]GETATTR:ld de,$5800 ;DE=attributes area base address
ld ...
ld h,b
xor a
srl h
SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... interfere with the screen attributes and as long ... /> and %00011000
xor %01000000
ld d, ... inverse character code (=CHR$ XOR $0f),
;as ... jr z,Matched
xor $0f ;change to graphic ...How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... row B column C with attributes A'
push af
xor a
srl h
ld (hl),a ;copy attributes for graphic
ld ...Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... (A) & 10 (E)
xor e
and %00000001 ;mask ... nc,SKIPDE ;skip if beyond attributes area (>=$5b00)
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... a useful complement to the attributes code.
xor e
rra
... amp; 12 (E)
xor e
rra ;align ... amp; 13 (E)
xor e
and %00000001 ; ...Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... selectively incrementing the colour attributes on each pass until ... and inc/decrement the attributes accordingly - but then ... & 10 (E)
xor e
and %00000001 ; ... 13616 ;offset to stored attributes
add hl, ...ZX Alien BreedNot sure if this has been mentioned already (I did trawl the threads but couldn't see anything :smile: ), but I've always hankered after a Speccy Ali…
... ' (collectibles) are added, with their attributes being fired straight to the ... by the aliens (with their attributes) and then the player sprite ... with their attributes. It seems long-winded, ... used a bit of fancy XOR'ing and some other logic ...Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... it does not clear the attributes. I have disassembled the MC ... )
LD B,A
XOR A
LD (HL),A ...clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…
... segment, mask the line
xor %00011000 ;if the segment is ... clear both bitmap pixels and attributes:
[CODE] di
If you want to clear attributes only, change the code above ...FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…
... different print modes available: or, xor, reset. I had to get ... is I have to apply attributes in every pixel row then ...Vertical XOR filler.. anyone?Hi, I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just tryin…
... L, X in H)
xor e
ld (hl),a ...
inc h
xor d
ld (hl),a ... whole characters, filling them with attributes.Vertical XOR filler.. anyone?Hi, I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just tryin…
... L, X in H)
xor e
ld (hl),a ...
inc h
xor d
ld (hl),a ... whole characters, filling them with attributes.
Nice. Thanks for ...Buddy 0.1 demo[url="http://wischner.co.uk/downloads/app.tap"]The tape is here[/url]. Load it, then enable kempston mouse emulation, then reload it. [url="https://g…
... to character coordinates so that attributes are lined up and the ... like line spacing, draw mode (xor, reset, or), colour, colour mask ...DEFFNder: a small library of BASIC functions written in Z80I've published a small library of 15 Sinclair BASIC functions written in Z80. I wrote it last year for a project of mine. Some of them are generic, s…
... 16 bit AND, OR and XOR bitwise functions and also
attributes are corrupted and the system ...LgK image compressorOk people, i decided to make it proper thread since i've finally got something tested & useful for everyone. Here is my "chunky" ZX image compressor …
... applies one of several useful xor-filters (not like joefish's ... 1-2 pixels shift then xor or with any already ... but maybe never).
Attributes are compressed differently, basically there ... to LgK-sfx to have attributes intermixed with tile data (as ...Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…
... Get current parity
0xEAA0 XOR L ; Update parity
... color (ROM)
0xEB28 XOR 03 ; Alternate border between Blue ... 22527 0x5000-0x57FF 01010xxxxxxxxxxx
;Attributes goes from
;22528- ...Examples of severe colour clash?I'm looking at making a video of ZX Spectrum games - both good and bad, and making it accessible for the layman. One thing I'd like to do is brief…
... places when it scrolls the attributes are mostly OK. The problem ... that the sprites are being XOR'd over detailed backgrounds, which ...Flicker-free animationTrying to create flicker-free screen update, but... Where I'm wrong? [url="https://dl.dropboxusercontent.com/s/pfywhfejfmwt2zq/test_128.sna"]Snaps…
[quote="Hikaru;883280"]Try with XOR %00001010[/quote]
Thanks, it works! But additionally I added clearing of shadow screen attributes to avoid black screen flashing.RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... Expand RLE-encoded array of attributes into multicolor area. The ... ((length = *array++) != 0) {
xor a
cp b
jr nz, paint_skip
xor a ; col = 0;
How would you do a negative image ?So I want to invert a Speccy bitmap. What would be the fastest and easiest way to this ? I've been using this a lot but I can't see how I could achi…
Invert attributes instead, i.e. swap the ...
rlca
rlca
xor e
and c
xor e
ld (hl),a< ...A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…
... (23693),a ;set ATTR_P
xor a ;BORDER = 0
call ... /> ld a,(23693) ;read current attributes
and 248 ;leave them ... ;load ATTR_T with the new attributes
call key_check ;decode ...ive found an attr scrolling routine but i want to remove the smaller scroller within it, etc.https://pastebin.com/K4nG3xbX also i would like to be able to change the colours and not have a shadow. http://www.worldofspectrum.org/pub/sin…
... ; attribute message scroll
XOR A ; FA1D AF
... C9
L_FAD6: XOR A ; FAD6 AF
LD ...
PUSH DE ; DE=attributes address
LD D, ...
