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<1…10111213141516…34>
  • 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…

    ... on "roms", read them byte by byte and interpret each value as ... am I supposed to on interrupt?" The vbSpec source code is ...
    Arjun Arjun May 2011 Emulators
  • multiple songs with savage enginesorry friends, another thread with my stupid questions. maybe wos should introduce a noob section for people like me? :oops: anyway, how does using …

    ... , and it should be one byte lower than lowest address used ... bit of memory to store interrupt vector. By default it is ...
    Shiru Shiru May 2011 Development
  • Random numbers...Hi Folks, I am not an expert when it comes to random numbers. If I have the RANDOMIZE statement the beginning of a program and then proceed to gene…

    ... . This assumes the basic rom interrupt routine is running becasue it ... necessary, by taking the lowest byte of FRAMES (the part that ... = address of the least sig byte of FRAMES.
    Alcoholics Anonymous Alcoholics Anonymous May 2011 Sinclair Basic
  • 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![…

    ... uses 64x64 map with one byte descibing two tiles (so it ... to have the display routine interrupt driven and have the non ...
    kphair kphair May 2011 Development
  • 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…

    ... cycles.

    Calculation: if interrupt occurs 50 times per second ... approx. 600 t-states per byte. If I read 32 bytes ...
    tstih tstih May 2011 Development
  • RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…

    ... .) Perhaps it relies on an interrupt being triggered at a very ... have slightly different timings per byte (like INC HL/DEC HL ... need for a well-timed interrupt? Either way... for this theory ... (R register or tstates-since-interrupt) is in a predictable state ...
    gasman gasman May 2011 Emulators
  • RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…

    ... as follows: it resets the interrupt enable flip-flop, clears the ... and R, and sets the interrupt status to Mode 0. During ... interesting to check if double-byte opcodes (such as PUSH IX ...
    Stefano Stefano June 2011 Emulators
  • Question about DivIDEHi guys, Tell me this... (please) DivIDE features an "auto-mapping feature transparently maps shadow ROM at important entry points". Depending on …

    ... error syntax
    #0038 - IM1 interrupt
    #0066 - NMI
    # ... example:
    CPU read first byte if instruction on adress #0562 ... connect external memory at first byte.

    Yet ... Example:
    CPU read instruction byte from adress #1FF8, after it ...
    velesoft velesoft June 2011 Hardware
  • Why doesn't my routine work?I have a "level" defined by 504 bytes (28 squares across x 18 squares down) I'm trying to write a routine that will take an X,Y coordinate in pixels…

    ... topic, more about how multi screen games were mapped ... ?t=34176&highlight=multi+screen+game"]http://worldofspectrum ... php?t=34176&highlight=multi+screen+game[/URL]
    byte decides how many, or ... a byte to say when to ...
    R-Tape R-Tape June 2011 Development
  • Why doesn't my routine work?I have a "level" defined by 504 bytes (28 squares across x 18 squares down) I'm trying to write a routine that will take an X,Y coordinate in pixels…

    ... INTERRUPT' ROUTINE
    ; --------------------------------
    ; This routine increments the Spectrum's three-byte ... ) ; otherwise increment FRAMES3 the third byte.

    [/code]
    Dr BEEP Dr BEEP June 2011 Development
  • 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…

    ... H is affected by high-byte addition". However, this changes the ... state explicitly that only high-byte addition affects the H flag ... about interrupts-there are 3 interrupt modes, interrupts can be either ...
    PeterP PeterP June 2011 Emulators
  • 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…

    ... H is affected by high-byte addition". However, this changes the ... state explicitly that only high-byte addition affects the H flag ... about interrupts-there are 3 interrupt modes, interrupts can be either ... and take the most significant byte for the new value of ...
    ccowley ccowley June 2011 Emulators
  • 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…

    ... state explicitly that only high-byte addition affects the H flag ... about interrupts-there are 3 interrupt modes, interrupts can be either ... memory). Let's call it byte pixels = speccy[16384+offset]. ... very specific bits in a byte array that correspond to the ...
    Arjun Arjun June 2011 Emulators
  • Fuse: what do you want to see?An open brainstorm. If you had a team of programmers working on [url=http://fuse-emulator.sf.net/]Fuse[/url], what would you tell them to work on? …

    ... anyway registering a peripheral activates its NMI and interrupt code etc. It ... "keep grafting new functionality on" peripheral model :)
    guesser guesser June 2011 Emulators
  • Port 254 emulation problem. Help, please ...Sorry, but my english is not pepfect. I have a problem and need in professional help. I have developed hard-soft emulator of ZX Spectrum 48. The link…

    ... XH,0X40 ; test if the byte reads from RAM or ROM ... /> COMDB: STS PORTF,ZERO ; Generate interrupt for videocontroller
    LDI TMPH ...
    Vasil Vasil June 2011 Emulators
  • binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…

    ... machines though.

    4. Multi-dimensional arrays? It'd be ... flags to have their own byte. :)
    Timmy Timmy July 2011 Development
  • binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…

    ... ).

    [quote]
    4. Multi-dimensional arrays? It'd be ... flags to have their own byte. :)[/QUOTE]

    C99 has ...
    Alcoholics Anonymous Alcoholics Anonymous July 2011 Development
  • Speccy screen display novice: What am I missing?[deleted]

    ... ]

    [QUOTE]After an interrupt occurs, [B]64 [/B]line ... timings) pass before the first byte of the screen (16384) is ...
    Ralf Ralf July 2011 Development
  • New WIP underway - 'Dingo'.Hi, Prepare for a long post. Perhaps I can even challenge ewgf here. :razz: Anyway, I've been meaning to get into Z80 programming and making a game…

    ... sprite line by line (or byte by byte) and redraw it at ... the new sprite. Draw a byte or line of one sprite ... . Assuming you're using an interrupt routine which increments the FRAMES ... you can keep checking the byte at 23672 to see how ...
    jonathan jonathan August 2011 Development
  • automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …

    ... been destroyed by an intervening interrupt by the time you read ... have to wait for an interrupt to occur. There is a ... simple compression applied, using one byte if relocation data is less ...
    Alcoholics Anonymous Alcoholics Anonymous August 2011 Development
  • 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…

    ... really important? Some other byte informs about Spectrum issue ( ... consider different Spectrum models, interrupt frequencies or video synchronization types ... puzzled by inconsistencies in byte order. First of two ... here as two different byte orders appear in one ...
    PeterP PeterP August 2011 Emulators
  • 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…

    ... /> [QUOTE]
    Some other byte informs about Spectrum issue (whether ... consider different Spectrum models, interrupt frequencies or video synchronization ... puzzled by inconsistencies in byte order. First of two ... here as two different byte orders appear in one ...
    ccowley ccowley August 2011 Emulators
  • Sinclair Programs uploaded.I've just uploaded a ZIP containing all the 'Sinclair Programs' programs and the instructions for each one. (Well all the ones from 'The Type Fantast…

    ... Osborne - Apr'84
    Free Byte - FJ Tew - Mar'84
    Multi Coloured Pyramid - Steven Day - Apr ...
    Neil L Neil L August 2011 MIA/STP/SDP
  • BUZZSAW+ Demo No. 3Right, another demo of BUZZSAW+. [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_3.tap"]Joefish_Buzzsaw_Demo_3.tap[/URL] The default con…

    ... top of memory, and an interrupt table in the page below ... . In between is a 176 byte buffer which contained my border ... an OUT 254 with one byte from a buffer, so I ...
    joefish joefish August 2011 Development
  • 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…

    ... most of those that used interrupt mode 2. Luckily one of ... actual problem was when an interrupt came and PC's value ... operand should be located one byte further. In this case "one ... byte further" is supposed to mean ...
    PeterP PeterP August 2011 Emulators
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... limitations like a 256 byte stack, 256 byte wrap on indexing, fastest ... to things like operating systems, multi-user environments, etc that the ...
    Alcoholics Anonymous Alcoholics Anonymous August 2011 Sinclair Miscellaneous
  • 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…

    ... you mean. If every interrupt service routine enabled interrupts directly ... interrupts in interrupt handlers. If we start interrupt handlers with ... decide to enable an "interrupt within interrupt". If we do it ... chips were of the 512 byte, 1k, 2k, 4k variety. ...
    Alcoholics Anonymous Alcoholics Anonymous September 2011 Emulators
  • 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…

    ... are so that the last byte in RAM can be poked ... attached or any standard z80 peripheral (CTC, PIO, SIO) that depend ... consequences. I suppose saving one byte and four cycles in said ...
    Alcoholics Anonymous Alcoholics Anonymous September 2011 Emulators
<1…10111213141516…34>

Latest Posts

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