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Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... in DOCK bank
xor a ; select the DOCK bank ...
push af ; $1907
xor a ; $1908
jr l1905 ... -
First steps in Z80 machine codeI never got into machine code much back when I had a speccy, as I didn't have any development tools at the time. The only machine code I'd previousl…
... routines (e.g. an 8x8 xor sprite routine), make simple sounds ... -
SPIN's breakpoints - an overviewAs quite a few people have been asking how to set breakpoints on memory write etc. in SPIN, here's a description of the way the breakpoints work. Get…
... supports | for OR and ^ for XOR, or you can use the ... words AND / OR / XOR.
The conditions you ... -
New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…
... b,28
fillscreen
xor a
ld (hl),a ... hl ;save road posn
xor a ;print new road
So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…
... AF ; save old lowerscreensize
XOR A
LD (23659),A ...Q on overflow on subtraction of 2 numbers.I came across this bit of code (paraphrased for clarity) that set the overflow flag on subtracting two numbers: result = A - B; overflow = (((A ^ B)…
... ; (A ^ result) & 0x80) != 0); //^ = xor operator
I understand ... the xor operation but I can't ...Unoriginal Unimaginative UnplayableOK, never mind all those great games, what were the worst? Keep it to games you (or someone you know) actually paid money for back in the days when 8…
... are drawn up with an XOR, so that two on top ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... this takes 2 bytes whereas 'xor a' takes only one. ... Insert line 6, 'xor a'
xor compares the chosen register ... 32 ;new carposn
xor a ;set carry flag to ... ;save road posn
xor a ;print new road
xor a ;set carry flag to ...Obfuscated code ideaThe instructions [b]SUB A[/b] and [b]XOR A[/b] both have the effect of setting the accumulator to zero. The only difference between them is that [b]…
... ]SUB A[/b] and [b]XOR A[/b] both have the ... the N flag, while [b]XOR A[/b] resets it.
XOR A
PUSH AF
A tidy loader for minigamesThe minigame competition doesn't permit the use of separate loaders like [code]10 LOAD "": RAND USR 32768[/code] The loader must be included in the b…
The minigame competition doesn't permit the use of separate loaders like
[code]10 LOAD "": RAND USR 32768[/code]
The loader must be included in the byte count.
In an attempt to save as many bytes as possible, people have written ...Assembler Shortcuts Reference?Can someone please refer me to a page of assembler shortcuts; ie. concise ways of doing things in a few bytes which might not be immediately obvious?…
... ? Two very simple examples are XOR A to reset the A ...Printer Printing Problem (assembler)I've a program that outputs to the lower screen at various places, using a combination of calls to RST $10 plus OUT-NUM-1 and PR-STRING. It also call…
A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…
... br />
__DRAW_SETUP1:
xor a ; nop
ld ( ...
ld a, 0AEh ; xor (hl)
__DRAW_START ... br /> inc b
xor a
scf
...
; DE = -dX
xor a
sub c
Moving to Oz, need to sell my stuff :(Let me know if you are interested in any of this or ALL of it. Hardware ? Spectrum + 3 including PSU(Keyboard works fine but can?t get the drive to …
... /> World Cup Football - Artic
XOR - Logotron
Yogi Bear - Alternative ...Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…
... CURRENT DATA VALUE)
XOR C ;XOR THE CURRENT VALUE (TOGGLE ... CURRENT DATA VALUE)
XOR C ;XOR THE CURRENT VALUE (TOGGLE ... CURRENT DATA VALUE)
XOR C ;XOR THE CURRENT VALUE (TOGGLE ... DATA VALUE)
XOR C ;XOR THE CURRENT VALUE (TOGGLE ...saving part of a BASIC programHere's a short routine to save part of a BASIC program. The idea is that it can be merged into a program and then used to save sub-routines, etc. to …
Here's a short routine to save part of a BASIC program. The idea is that it can be merged into a program and then used to save sub-routines, etc. to be combined or merged into other programs. It's sort of a slow version of copy & paste. The two line ...And Another one!The lists keep coming! Good to get plenty of response on these so far, thanks. Box 4 Star Wars ? Domark Stars on the 128 (compilation) ? Ocean (Inte…
New SpecBAS available - v0.710Been a while, but I've just uploaded the latest build of SpecBAS. This one now supports tilemaps (with rotation and scaling) and added OVER mode (XO…
... scaling) and added OVER mode (XOR) to many of the graphics ...Incorrect joystick decoding in Fuse & SpectaculatorAccording to a test that a fellow member ([B]utopian[/B]) at the [url=http://www.speccy.org/foro/viewtopic.php?f=6&t=2475]speccy.org[/url] forum has …
... if and only if A11 xor A12 = 1, so the condition ...A 30th Anniversary ProjectHappy new year (belatedly...) So with the 30th anniversary approaching, I've decided to do a hardware project to celebrate it. Something hands-on (o…
... outputs are combined by an XOR gate. The output - basically a ... series of pulses - from the XOR gate is run through a ... are combined by a 4070 XOR gate, and then re-inverted ...
