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"ZX80 Brain" RPN CalculatorIt is at times like [url=https://www.worldofspectrum.org/forums/discussion/54176/depression]when threads such as this are posted[/url] that I get the…
... not trying to divide by zero
- the stack won't ... values or empty beyond a zero stored at the bottom
flag gets stuck on and it ... -
Chequered Flag needs a remake!I don't know about the rest of you guys but I always thought Chequered Flag was great. There was speed and challenge of trying to master the cars an…
... but I always thought Chequered Flag was great. There was speed ... -
Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
Pity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the ZX Spectrum 48K. It was for a text/graphic adventure I'm working on. The algorithm is based on [url="http ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> inc a ; clear z flag
ret
.somethingpressed ... .only1halflinepressed
xor a ; zero A
.shiftand1otherlinepressed
ld ... /> or a ; clear carry flag
rra ; rotate right ... case we return with Z flag clear
neg ; ... -
TZX format updateHi folks. Following the private communication with Andy I would like to start a discussion on changing the TZX format to reflect new needs and improv…
... /> 05+2N 2 Length of ZERO bit 1st pulse [855]
07+2N 2 Length of ZERO bit 2nd pulse [855]
For speedlock-like flag bytes
0e+2N 1 ... 1 Various flags - bit 0 flag byte present
bit 1 ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... IFF2 to the P/V flag) is interrupted, then the P ... /V flag is reset, even if interrupts ... (23728) if it was non-zero. Unfortunately, the test was reversed ... and only if it was zero (thus causing a reset). However ... -
Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…
... Byte is used as a flag for whether sprite is on ... of sprite collided with or zero
if no collision. All ... -
Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
... Byte is used as a flag for whether sprite is on ... of sprite collided with or zero
if no collision. All ... -
Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... ,hl,af'
; exit : carry flag set: key is registered, a ... ,0
ld (state),hl ; zero state AND count
xor ... -
New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... INPUT. It starts off at zero but may be changed. Any ... send to the printer. A zero would mean it is to ... pressed.
Bit 7: Syntax flag.
These will be ...
Specifies cursor. Values zero, one, two or four specify ... -
Preservation QuestionsHi, I went reminiscing of the past recently and found this site, and firstly can I say thank you VERY much, this is by far one of the best Spectrum s…
... Action Pack, it has Mission Zero and Q's Message on ... I think, they have load "flag" "example" and "vu3d" on them ... -
Lots of Speccy games / hardware for saleGot a lot of tapes/unboxed tapes, hardware for sale (not sure what all the hardware is !) Any ideas on a rough price for it all ? Also any help iden…
... Safari
Skooldaze
Chequered Flag
Hungry Horace
Flight ... -
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…
... ,hl,af'
; exit : carry flag set: key is registered, a ... ,0
ld (state),hl ; zero state AND count
xor ... -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... the peaks well above the zero crossing. Not a problem for ... has its own initial polarity flag.
At this point ... -
Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…
... flags, and creates a spare flag:
&5C6A FLAGS2 ... /b6/b5 holds tokeniser flags, zero by default.
The ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... /> [/LIST]
The flag byte passed to "sp1_Initialize()" as ... set, an existing non-zero pointer in the tile array ... with some flag bits.
Possible flag bits are ... occluding by using the SP1_TYPE_OCCLUDE flag. An occluding sprite character ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... ) I also add the SP1_TYPE_BGNDCLR flag so that SP1 will clear ... visited. The count starts at zero and is incremented for each ... -
In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…
... /> ld e, 0 ; reset swap flag
bubble: ld a, (hl ... next
ld e, 1 ; flag we swapped bytes
push ... e ; check flag
jr z, sort ; if zero, swap occurred so ... -
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... SORT8 LDY #$00 ;TURN EXCHANGE FLAG OFF (= 0)
STY ... /> LDA #$FF ;TURN EXCHANGE FLAG ON (= -1)
STA ... BIT $32 ;YES. EXCHANGE FLAG STILL OFF?
BMI ... by using page zero for the flag on the 6502 ... -
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... /> ld e, 0 ; reset swap flag
bubble: ld a, (hl ... next
ld e, 1 ; flag we swapped bytes
push ... e ; check flag
jr z, sort ; if zero, swap occurred so ... -
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... nz,sort ; if not zero we did a swap< ... sort LDY #$00 ;TURN EXCHANGE FLAG OFF (= 0)
... 2 LDA #$FF ;TURN EXCHANGE FLAG ON (= -1)
3 ... BIT $32 ;YES. EXCHANGE FLAG STILL OFF?
2/3 ... -
Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... is a flag-bit which can be used for zero / non-zero tests ... , you only need to setup the flag register ... -
Totally unrelated to Speccies...But fun, nevertheless. [url]http://homepage.ntlworld.com/paul.dunn4/Letters.rar[/url] Have a go, lemme know if there's any ways you can think of to…
... /h, as there is none, zero, nada, zilch, you pay absomututely ... the only way to actually flag a letter as discarded, they ... -
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…
... that LDD sets a flag when BC reaches zero so the djnz ... since this affects P/V flag
push hl ; save column ... -
DivIDE and RWAP's DiwIDE*Opps, sorry, wrong forum, this thread must be in hardware topic.* I was planning to get a divide from Rwap, but I'm too afraid of long way the devi…
... needed, we propose that this flag combination will be used for ... that "ext" bits are undefined (zero) and that two "val" bits ...
