-
30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... ; extra delay
; 16235T
XOR A ; extra delay
; 16239T ... ; extra delay
; 16293T
XOR A ; extra delay
; 16297T ... -
Adding a pause key to ArkanoidHaving rediscovered the simple pleasure of playing 1980s games on genuine 1980s hardware, I've also remembered that emulation can provide a feature m…
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…
... /> rrca ;a=CFEHGBAD
xor c
and %01100110
rrca ;a=CFEHGBAD
xor c
and %01100110
JSW2 - Game Loader DifferencesThere are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it …
There are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it incorporates a built in cheat mode. Feedback on this point is appreciated. To quote the readme:
RCS HelpThis plea for HELP is related to the RCS screen handling routines thread. To further save space in the current crop of routines its looking like the …
... a,b
A9 lp1 xor c
E6F8 and $f8 ...
A9 xor c
57 ld d ... ,a
A8 xor b
A9 xor c
07 ...LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... ; store in byte counter
xor 19 ; see if it's ...Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…
... higher byte into C
XOR A ; Prepare to test B ...Game loopJust working on my first ever Spectrum game, and am struggling to work out what the game-loop should look like. I've got interrupts enabled (mode 2)…
... right? I've decided to XOR my sprites onto the screen ...Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... /> ld l,e
xor a
ld d,a ...
ret nc
xor a
ld l,a ...
ret nc
xor a
ld l,a ...reversing an LFSRWhat's the correct way of reversing an LFSR so that it produces the same numbers but in reverse order? The little BASIC program below shows a test I …
... xor=xor AND xor2
21 LET xor=xor+VAL a$(3): LET xor=xor AND ... xor2
22 LET xor=xor ... +VAL a$(2): LET xor=xor AND ... xor2
40 LET a$=CHR$ (xor+48)+a ...Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…
... 23659)
65043: XOR H
65044: XOR L
65045: ... 65205: NOP
65206: XOR C
65207: AND 32 ... L
65374: XOR 121
65376: XOR (IY+32)
65461: XOR C
65462: AND ... A
65495: XOR D
65496: XOR D
65497 ...Venturespeak Helplooking at the code from ZX Computing, October, November & December 1986. How do I make the code do more then 3 letters say 5. and could it be made …
... RST #10
60201 AF XOR A
60202 D7 RST ... #10
60203 AF XOR A
60204 D7 RST ... RST #10
60275 AF XOR A
60276 D7 RST ...understanding machine codeHi Quick question. Am not really sure if it fits development forum as its not really development per se its more a learners question about developm…
... S_PRINT
AF START XOR A
323C5C LD (TVFLAG ... 00 by the way, from XOR A.
Am not ...Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... /> LD A,C
XOR 003
LD C,A ... br /> RL C
XOR L
RET NZ
RRA
XOR C
AND 032
LD A, C
XOR 3
LD C, A ... br /> RL C
XOR L
RET NZ
RRA
XOR C
AND 32
Which games perform checksums on the 48K ROM?I've just modified a version of the 48K Spectrum ROM designed for use on the Timex Sinclair 2068, so that a 16 bit checksum of the ROM produces the r…
... $641F and an 8 bit XOR test produces $41. These are ...They Stole a MillionI noticed that the tzx on the site is missing a Speedlock Block for Part 2. I don't own the original so cant make a perfect tzx, but I did recreate t…
... is doing LD A,69 XOR (HL) ADD A,239 so ... B,A LD A,69 XOR B to make the encryption ...z80 commands timeshi! I need site with z80 commands mashine times. I remember, I saw one as table, maybe in .cc domain, but pity forgot link. for example LDI take 16 …
... LDI take 16 machine times, XOR A - 4 e t.c ...1st interface in 30 years (update)Hi all, Just a wee update to my "1st ZX interface in 30 years" project. Main IC's: 82C55 three 8-bit port I/O (configured for 12 dig in, 12 dig out…
... - Address decoding
74LS86 - Quad XOR
So, for no ... I added a couple of XOR gates in order to tie ... .The cockroach is the Quad XOR as a temporary measure till ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... /> AND A
RRA
XOR B
AND $F8
XOR B
LD H,A< ...
RLCA
RLCA
XOR B
AND $C7
XOR B
RLCA
RLCA< ...Kempston joystick detectionIn both [url="http://skoolkit.ca/disassemblies/manic_miner/asm/34252.html#34332"]Manic Miner[/url] and [url="http://skoolkit.ca/disassemblies/jet_set…
... (which are already disabled)
XOR A ; A=0
LOOP ...LOAD "" CODE in machine code/store 128 bank dataHow do you LOAD "" CODE from machine code? I have written the following MC routine that fits into a REM statement in a basic program. I want to cal…
... ; set our screen colours.
xor a ; quick way to load ...found halfMIA - DynaStarfull tap/tzx + xor`ed final picture & inlay [url]http://rghost.ru/58944155[/url]
full tap/tzx + xor`ed final picture & inlay
[url]http://rghost.ru/58944155[/url]Pixel level collision detection[SIZE=3][FONT=Calibri]I need to do some pixel level collision detection. Assuming I have a byte of my ?player? sprite in DE and a byte of screen to t…
New version emulator ZEsarUX-2.1Hi I have uploaded a new version of my ZX80/81/Spectrum/Z88 emulator on http://sourceforge.net/projects/zesarux/ Changes are: Added Cocoa…
... expressions with "and", "or" and "xor" logical operators
-Special word ...SAM Revival magazine issue 25 now out!It's finally out! * SAM Revival issue 25 - 56 pages packed with SAM Coupe goodies for the 25th Anniversary of the computer. * Brand new SAM Robot…
... demo downloads the full game 'XOR' from the net directly to ...
