-
Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…
... way of doing it in two instructions at least:
t preserve the sign for negative ... instead of one and 16 t-states instead of 11, so it ... make even if I didn't actually state it like that ... -
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... /> exx ; 57600 BAUD (61.57 T-states)
dec de ; Length -1 ... port adaptor (?10) and one two meter male to female null ... -
Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
... to the left in 11 T-states (cycles) but you will have ... add instructions.
Two 18 T-state instructions exist to rotate ... Tip:
Pair up two rotate instructions that use the ... -
emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... />
As PUSH is 11 T-states - that will be the reason ... last night to badly solder two female phono connectors to the ... work, my X girlfriend, a two day headache, emulators not doing ... 1993...
Here are two other problems:
PlayTZX ... -
looking for a tap2wav coded in Python, Perl, Ruby or Luasince some months i started this project - [url]http://nitrofurano.altervista.org/experimental/webcampictureson8bitcomputers/index.html[/url] the pr…
... - 2168 T-states at 0x0 followed by 2168 T-states at 0xFF per wave.
[*]Sync Pulse - 667 T-states at ... 0x0 followed by 735 T-states ... -
looking for a tap2wav coded in Python, Perl, Ruby or Luasince some months i started this project - [url]http://nitrofurano.altervista.org/experimental/webcampictureson8bitcomputers/index.html[/url] the pr…
... - 2168 T-states at 0x0 followed by 2168 T-states at 0xFF per wave.
T-states at 0x0 then 1710 T-states at 0xFF.
# * Zeros are 855 T-states ... at 0x0 then 855 T-states ... -
Trying to like Black Books, perhaps I'm deadI'm a massive fan of Father Ted and as such I thought it time I started to watch Black Books as it seems to have a pretty good reputation. I'm 4 epis…
... Vic Reeves, I just don't see anything funny, yet ... work, but it doesn't make me laugh. Whereas ... sometimes poignant, but it doesn't make me laugh.
... tend to see maybe two funny jokes per episode. Yes, it ... ), but it just doesn't make me laugh. To ... -
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…
... ,0" (except when you don't want to clear the carry ... code seems to remember two key presses per pass in order to ... have it now this won't necessarily be the result (you ... -
50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
Actually, Pentagon does not have more t-states in a frame, it just has longer frames, because it has 320 scanlines per frame (48.8 Hz framerate). Clock frequency and scanline length in t-states are the same. -
enJine: a fast tilemap enginetile engine based on excellent work by Joffa Smifff. here you can download first tech demo. [url=http://ketmar.no-ip.org/tmp/enJine.tap]Get It Now![…
... the demo, engine itself doesn't care. port #FF used for ... of action to compensate unused t-states.
[i]>Will ... able to squeeze logic in two parts: 'before crt ray' and ... -
Musician needed!An old "classic" game had a tune in it which didn't sound too good. The beeps below should give you a clue as to which program I'm talking about... […
... bytes are pairs (one note per 2 bytes). The first byte ... = (L*16)+(H*4105)+33 T states
freq = 3500000/((74T+delay ... work to the nearest 16 T states, as far as I can ... has a resolution of 4 T states), then either:
- piggyback on ... -
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... can take from one to two bit times. this code is ... ) |8 t-states
nop ; nothing | 4 t-states
; exactly 30 t-states!
t-states
nop ; nothing | 4 t-states
nop ; adjustment to 31 t-states ... -
enJine: a fast tilemap enginetile engine based on excellent work by Joffa Smifff. here you can download first tech demo. [url=http://ketmar.no-ip.org/tmp/enJine.tap]Get It Now![…
... is that i can't start screen output when ... have to wait ~14000 t-states (i can do some game ... , oh, why we can't have two separate page banks?! %-)
t overlap at all).
< ... gt;Fingers crossed this shouldn't be necessary[/i]
... -
enJine: a fast tilemap enginetile engine based on excellent work by Joffa Smifff. here you can download first tech demo. [url=http://ketmar.no-ip.org/tmp/enJine.tap]Get It Now![…
... is that i can't start screen output when ... i have to wait ~14000 t-states (i can do some game ... but then i can't use page switching for code ... , oh, why we can't have two separate page banks?! %-)[/QUOTE ... ]>Fingers crossed this shouldn't be necessary[/i]
... -
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... 50 times per second this gives us 70.000 t-states (i've ... .08 Hz.
Doesn't really affect your calculations, but ... -
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... JP (HL) spending just 4 t-states would make detection very quick ... t-states if no flag is set thus reducing the spread between two ... />
Best case:
11 t-states
Worst case:
t-states to fall into 28-49 t-state. Adding cca. 7 t-states ... -
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
two words. 1.it, 2.works. :) ... to msb (e) |8 t-states
nop ; 4 t-states
in ... to msb (e) |8 t-states
nop ; 4 t-states
in ... /> ld a,e ; 4 t-states
cpl ; 4 t-states
ld (hl ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... case: addition of these two numbers gives us a carry ... s manual and Zaks don't state explicitly that only ... start (although I don't think there is any mention ... to execute them every 69888 t-states - for IM 0 or ... now - this should take 19 t's). EDIT: Actually, to ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... , because you don't run exactly 69888 t-states every frame. Instead do ... was working properly (it didn't. bah). Then, I implemented ... I'm using 32-bit per pixel for RGBA value. Yours ... /> [/quote]
Snapshots don't require any loading routine because ... -
Speccy screen display novice: What am I missing?[deleted]
... ]64 [/B]line times (14336 T states; see below for exact timings ... />
3)
The bottom two lines where you type instructions ... , whre you can't PLOT and DRAW and which ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... (and very serious) bugs in two remaining games. Particularly, in both ... also invisible, but there are two more visible bugs:
... message in Manic Miner) and two remaining games work well. I ... for a considerable number of T-states no other instruction but DJNZ ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... redraw screen once every 69888 T-states. Isn't that the right thing ... :
- it can't be display_screen() routine, otherwise at ...
- it can't be snapshot loading routine, otherwise ... Fuse debugger). I didn't compare all locations in RAM ... -
which zx-spectrum games uses 1bit sound samples?hi! I'm looking for zx-spectrum games using 1bit sound samples. Compairing with msx, which has far less games available than zx-spectrum, there are f…
... these is OUTed for 45 T-states)
01 = 100100100
two 4-bit samples in ... longer than the current two or three seconds. The ... bit limited as 105 T-states are spent with the ... the exact timings-- 159 T-states instead of 135 would provide ... -
which zx-spectrum games uses 1bit sound samples?hi! I'm looking for zx-spectrum games using 1bit sound samples. Compairing with msx, which has far less games available than zx-spectrum, there are f…
... would be to have two 3-bit samples per byte, but as ... of eight 3-bit samples per three bytes, meaning some samples ... at 26.3kHz or 133T-states per cycle (76+38+19 for ... -
Rebelstar 2 - hints and tipsI'm somewhat depressed as my games console broke the first day of this holiday period and getting a replacement is not so easy and taking time. I wan…
... the droids.
- Don't bother using aimed shots, you ... a cost of only two action points per shot.
[b ... (relatively) clear.
- Don't waste combat droids' blast torch ... be good shields, they aren't invulnerable and you need them ... -
Faster CLS...Hi Folks, Looking at the CLS command in the Spectrum ROM disassembly it seems rather complex. Does anyone know of a simpler/quicker routine that wi…
... can an LDIR at 21 T-states (plus contention, so 24T a ... in less than 100,000 T-states?[/QUOTE]
I did ... " ... that's referring to the T-states counter in the Registers window ... it even goes backwards between two consecutive commands. -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... , i.e. multiples of 4 T-states. So unless you calculate the ... need, run at particular T cycle, with T cycle accuracy. See the ... worldofspectrum.org/forums/showthread.php?t=17551&page=10#post215794 ... to, i.e., between the two instructions.
Patrik -
Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…
... NOPs - that takes exactly 32 T states to operate. So I know ... into contended memory, counting between two interrupts, to see if I ... which Speccy. See the first two messages here (and try not ... .worldofspectrum.org/forums/showthread.php?t=24242[/url]
...
