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I introduce myself and my emulator.Hi! My name is Marta, and I've been a Speccy user for 30+ years now. During the past year I decided to write my own emulator, just to see if I cou…
... I found an issue: I was sampling the interrupt line every T-state ... the beginning of the last T-state of the last M ... . In the meanwhile, I got an *almost* exact cycle-by-cycle ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
@Ast_A_Moore Doesn't the AY get it' ... and the 224 vs 228 t-states/scanline difference is a problem ... vs screen. I don't know of beeper engine that ... practise, it doesn't seem to matter an awful lot though.
an [url=https://www.ime.usp ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... CPU though? So that wouldn't actually matter.[/quote]
... the 224 vs 228 t-states/scanline difference is a ... vs screen. I don't know of beeper engine that ... practise, it doesn't seem to matter an awful lot though ... clock speeds, I don’t see how tuning would be ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... ) = 4 nullbytes = 4 nops = 16 t-states wasted.
Ok so ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... a little longer because of an extra instruction.
Emulated ... do it myself.
T state breakdown is as follows ... + 10 + 13 × 89 + 8 = 1208 T states.
48K: 3.5 ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... 2nd of the 4 last t-states of any OUT command always ... with 6th or 7th t-state of an 8 t-state cycle, counting ... -
Your favorite games remakes of which you are still waiting forMy wish list: 1) Gunfright 2) Turbo Esprit 3) Zorro 4) Alchemist 5) Custard Kid 6) Dun Darach 7) Go To Hell 8) Little Puff 9) Luna Crabs …
I know I say this every time one of these threads ... , but it wasn't very good.
An online, multiplayer remake ... -
[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... at all - each mistake is an opportunity to learn more :) That ... is useful with all the T-states on the same page, does ... and it tells you the T-states taken by each instruction and ... /spreadsheet to do it shouldn't be very hard.
Looks ... -
[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... T-states taken by each instruction and overall?[/quote]
I use an ... -
Any 'emulator + single game packaged in a ,exe file" utilities around?Morning all, I'd like to be able to create a single executable file that contains an emulator and a single game/utility that starts loading process …
... your machine to open every .TAP file with an emulator you already ... would have to contain an instruction to launch an emulator, with the ... source code of an emulator that also doesn't need any config ... distribution restrictions. And I don't know of any. -
Anti "manspreading" chair gets award.[img]https://images.immediate.co.uk/production/volatile/sites/3/2016/08/113961.jpg?quality=90&resize=620,413[/img] Margaret, come and take a look …
... real world, you can't retreat yelling an imaginary place to people ... against them don't exist. Really they don't all these people ... who scream "Phobia" just shouldn't, the people who genuinely hate ... practically running up a wall every time one of these "victims ... -
Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…
... an interrupt driven routine that syncs to screen refresh, then use t-states ... -
Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…
... left. So for 96 T-states per line there is no ... can only write one byte every 8T. So for example, ... which tick in a multi-T-state instruction the read ... . You see, you can't even rely on the interrupt ...
Nirvana etc. engine doesn't use a linear buffer of ... -
Loading Schemes > 1-bit per 2 edgesHi Guys, I'm just having another look at loading schemes again (a subject that interests me). Does anyone know if there any loading schemes t…
... As a general rule, every new game gets one in ... peripherals that don't support something an unexpanded Speccy does ... the company managers in every case to know for ... .
As an aside, I used to crack ... pressing 'ESC', it wasn't much harder than that, ... -
Need some help building a cable for Spectrum 128k +2 to US Commodore 1084S-PHello WoS users! Does anyone have a diagram detailing how to build a cable to go from the Spectrum 128k +2 (grey) to a Commodore 1084S-P (US version…
... brightness flashing just slightly brighter every other split second. The ... pixels. This isn't much of an issue as the boot ... guess that could just be an old tube, or just ... this monitor looks. Don't get me wrong, it ... and I really don't want to break anything.< ... -
Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …
... you trying to say that every emulator written for the Spectrum ... also incorrect as it clearly states on page 227 "the first ... CPU clock cycles or 14336 T-states".
My advice would ... it thoroughly, it will answer every question you can think of ... -
Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…
... . Tape leader is 8063*2168 t-states, at 3.5Mhz that's ... tape speed is an average between 855 and 1710 t-states per bit ... i.e. 11542.5 t-states per byte ... . 2.7 minutes? I don't remember it being that fast ... -
Other books worth getting as good as "Speccy Nation"?I bought this off amazon - it has reviews of fifty Spectrum games that capture the essence of the machine, and it looks good fun. I'm wondering if th…
... of books that aren't entirely dedicated to it ... 's worth every penny:
[b]Britsoft: An Oral History[/ ... the industry, but doesn't focus just on the UK ... joy to read each and every entry - even for movies ... specific book that I can't honestly recommend, even if ... -
ZEsarUX Beta 8.1Hi! I have uploaded a new ZEsarUX 8.1 BETA version. You can download compiled versions for Windows, Mac, and the source code from: https://gith…
... : IM mode 0 is 1 t-state shorter than IM mode ... the IM instructions take 8 t-states
In practice, under ... device generating the interrupt places an instruction on the data bus ... take the same number of t-states (11) as per above.
ZEsarUX Beta 8.1Hi! I have uploaded a new ZEsarUX 8.1 BETA version. You can download compiled versions for Windows, Mac, and the source code from: https://gith…
... : IM mode 0 is 1 t-state shorter than IM mode ... the IM instructions take 8 t-states
In practice, under ... device generating the interrupt places an instruction on the data bus ... take the same number of t-states (11) as per above.
What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... />
POP BC = 10 T states
An equivalent:
LD ... B,(HL) = 7 T states
INC ... ) = 7 T States
INC HL = 6 T States
Total = 26 T states
Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... loading time remaining. Don't think it's ever ... of T states would typically result in visible flickering an so ... on. And you can't afford ... group beginning with T. Can't remember or find ... each taking max.300-400 T states. There's no attempt ...Dynamite Dan II - Island 6 - HELP!Hi all, can someone possibly create a snapshot of Island 6 (car park island) on Dynamite Dan II for me please? I'm trying to work out why half the…
... the game loop about 100 t-states faster as well, as it ... straight away if 'P' isn't pressed. Before it went through ... notice any speed increase, but every bit helps.
Here ... select a level that doesn't exist now. The old tap ...Is it possible to ignore a user 100%, including topics created by such user?I know we have the option to ignore a user and skip seeing their posts, but if they create a topic it's still visible. Is it possible to block a user…
... annoying voices surely? We don't need no stinkin' confirmation-bias ... We grew up in an era when parks had a ... of parked cars). Every school day presented an array of injured ... planks or annoying ticks isn't what we do! No. ... censorship! We simply don't need it. :DIs it possible to ignore a user 100%, including topics created by such user?I know we have the option to ignore a user and skip seeing their posts, but if they create a topic it's still visible. Is it possible to block a user…
... annoying voices surely? We don't need no stinkin' confirmation- ... We grew up in an era when parks had ... parked cars). Every school day presented an array of injured ... planks or annoying ticks isn't what we do! No ... imposed censorship! We simply don't need it. :D [/ ...
