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<1…22232425262728…34>
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... really have to count every instruction.

    16T for writing ... - that's one byte every 8T, or one byte for every opening ... because of contention the PUSH instruction is extended out to 24T ... tried to do an EXX instruction between PUSHes. Though the result ...
    joefish joefish June 2013 Development
  • Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…

    ... frequent operations (e.g. one byte instructions) last 1 clock cycle ... connect and use whatever Spectrum peripheral that exists, and load and ...
    Alone Coder Alone Coder June 2013 Development
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... difficult to make an orthogonal instruction set. There's just not ... and it has a huge instruction set that doesn't leave ... POP that uses a post byte to determine which registers are ... it did better.
    The instruction prefetch makes everything faster.
    JamesD JamesD June 2013 Development
  • Storing strings in minimum spaceIn the game I am planning there will be a number of text strings. I am looking into different ways of encoding the strings so that they use the minim…

    ... thought is don't use multi-dimension string arrays unless all ... the token technique and single byte values $A5-$FF to replace ...
    Battle Bunny Battle Bunny June 2013 Development
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... been a very nice instruction for a quick byte copy without the ...
    MatGubbins MatGubbins June 2013 Development
  • Microdrive Serial ProtocolGentlemen, I've been dreaming for a long time to develop a Microdrive emulator, where an SD card loaded with .MDR cartridge images can be accessed t…

    ... . Especially if you determine what byte is being sent or received ... start shifting in the next byte. Not owning an IF1, I ... going to have a one byte buffer at most at a ... stay in sync with the instruction that's running enough to ...
    Winston Winston June 2013 Hardware
  • Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…

    ... /> instruction read
    RAM read (by byte)
    RAM write (by byte)

    For istance with the instruction:

    DJNZ n pc ...
    Oibaf Oibaf June 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... mistake in interpretation of this byte :)

    Could you explain ... using different way to interpret byte 19...
    Very strange... So ... in the bit 2 of byte 19... It was too long ... stack so that a RETN instruction can restart the program"
    Korinel Korinel July 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... 0 of the interrupt flags byte. It can be found at ... .8.1. Its interrupt flag byte is 4; it's been ... bit 0 of the flag byte as IFF1, I suspect it ... hang on encountering the HALT instruction.
    John Elliott John Elliott July 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... 0 of the interrupt flags byte. It can be found at ... .8.1. Its interrupt flag byte is 4; it's been ... bit 0 of the flag byte as IFF1, I suspect it ... hang on encountering the HALT instruction.[/QUOTE]

    On ZXMAK2 ...
    ZXMAK ZXMAK July 2013 Emulators
  • esxDOS v0.8.5 released (with TR-DOS emulator)Yup, you read right! Now with TR-DOS emulation! More info and download here: [url]http://www.esxdos.org/[/url] Enjoy :)

    ... /> etc...

    Read one byte from ZXI port to ZX ... possible read one byte per 16T (one INI instruction)

    Max ...
    velesoft velesoft July 2013 Announcements
  • SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…

    ... just a 64K array - one byte per memory location (so 48K ... the moment).

    Each byte is:
    // bit 0 -> ... code is is on an instruction boundary
    // (start of ... an instruction)
    // bit 2 -> ...
    Jon Needle Jon Needle July 2013 Announcements
  • SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…

    [QUOTE=Jon Needle;710993]Each byte is:
    // bit 0 -> ... code is is on an instruction boundary
    // (start of an ... may be accessed sometimes as byte and sometimes as word, thus ... even store sometimes the first byte in a word, and sometimes ...
    Einar Saukas Einar Saukas July 2013 Announcements
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... at 867B. Prior to that instruction, the accumulator contains a load ... derived from E (the low byte of the counter that counts ...
    stephenw32768 stephenw32768 July 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... nop ; placeholder for one instruction
    endm
    ... nop ; placeholder for one instruction
    endm
    ... ; placeholder for two-byte instruction
    nop
    stephenw32768 stephenw32768 August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... nop ; placeholder for one instruction
    endm
    ... nop ; placeholder for one instruction
    endm
    ... ; room for a one-byte instruction
    and 7 ...
    stephenw32768 stephenw32768 August 2013 Development
  • Hardware description - PLUS D interfaceThis new thread will contain onformations of different ZX devices. Some devices contain manuals, schematics or firmware for some chips, but some peop…

    ... external memory if CPU read instruction byte from adress #8,#3A or ...
    velesoft velesoft August 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... (ix+0),a ; store byte
    ifdef loader_advance_pointer
    byte

    .verify_checksum:< ... nop ; room for one-byte instruction
    ld sp,(.sp) ...
    stephenw32768 stephenw32768 August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... /> nop ; placeholder for one instruction
    endm
    < ... /> nop ; placeholder for one instruction
    endm
    < ... ; room for a one-byte instruction (4T)
    .border_mask: ...
    stephenw32768 stephenw32768 August 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... for saving the extra byte in the instruction stream, the distance to ...
    u6c87 u6c87 August 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... false, is the offest byte or new PC actually fetched ... php5?title=Contended_memory#Instruction_breakdown]The instruction timings table in the FAQ ... with memory contention. If the byte(s) is/are actually ... contention is limited to 1 byte rather than 2.[/QUOTE]< ...
    gasman gasman August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... /> in f,(c) ; 12T undoc instruction - yes, that is the flag ... read? Does setting the high byte of the port address to ... /> in f,(c) ; 12T undocumented instruction
    call po/pe,exit ...
    stephenw32768 stephenw32768 August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... ; I even left the XOR instruction in (as XOR 0) so ... the first bit of each byte (as LD-BYTES does). But ...
    stephenw32768 stephenw32768 August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... (we didn't copy the byte
    ; when we saw it ... better if you eliminate this instruction above and "compensate" this in ...
    Einar Saukas Einar Saukas August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... better if you eliminate this instruction above and "compensate" this in ... on there being such a byte that doesn't exist anywhere ... whole class of them (any byte representing the ink and the ... won't contain any such byte. On the other hand, some ...
    stephenw32768 stephenw32768 August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... -state required by every single instruction executed. This is what I ... replace it with a two-byte checksum along the lines of ... update by XORing a single byte in the display file. I ...
    stephenw32768 stephenw32768 August 2013 Development
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... otherwise its such a spartan instruction set and to have somthing ... changes the bits of the byte at that address.

    byte of the screen display.
    Pobbit Pobbit August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... and c ; combine with byte being loaded (4T)
    ... and h ; combine with byte being loaded (4T)
    ... ld a,(.read_edge_test); place test instruction in accumulator, 13T
    ...
    stephenw32768 stephenw32768 August 2013 Development
<1…22232425262728…34>

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