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<1234567…34>
  • how to reflect a byte's bit-pattern in assembly?I'm trying to use 16 pixel-wide graphics which are symmetrical around the vertical, i.e. if the left byte is 01001110 the right byte will be 01110010…

    ... . if the left byte is 01001110 the right byte will be 01110010 ... . Is there a fast way ... in assembly to generate the right byte given ... the left byte? At the moment ...
    bigjon bigjon January 2009 Development
  • How do I convert a spectrum audio tape into a spectrum file?Hi there, I have a couple of old tapes lying around with some v.old spectrum basic programs written many years ago. I'd like to digitise these for po…

    Hi there,
    I have a couple of old tapes lying ... sound card, record it as a wav and then use some ... convert the audio signal into a byte stream so it can be ...
    paynterr paynterr September 2003 Emulators
  • Idea for a new feature to compliment a debugger in an emulatorI had an idea for an emulator feature yesterday. Don't recall having seen this idea before, but I'm sure you'll correct me if it has. :) In that cas…

    ... , but it would still be a good idea and could come ... - all represented using colors in a window where each pixel is ... was used as a counter instead of a byte, to keep track of ...
    Sokurah Sokurah December 2004 Emulators
  • What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…

    ... about this, but only thought a bit more about it last ... to every screen position - a byte with just a single bit set. I ... this what is happening during a reset: the entire RAM is ... so, why? Is this just a RAM test to make sure ...
    Gwyn Gwyn February 2006 Sinclair Miscellaneous
  • A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…

    ... for a '1' bit or '0' bit within the byte ... shifts each bit in a byte so it can be ... a single 8-bit register (L) holds both the byte that ... If ZF is set, the byte has already been trasferred. If ... ;Other stuff... load next byte and so on...
    SEND_ZERO ...
    mcleod_ideafix mcleod_ideafix January 2011 Development
  • Byte Drive 500I also received a Byte Drive 500 3" floppy drive, but I don?t really know how to connect the unit to a Spectrum. From the little information on the B…

    I also received a Byte Drive 500 3" floppy drive, ... unit to a Spectrum. From the little information on the Byte Drive ... considered to be kind of a generic FDD, that could be ... the box offers two connectors: A four pin HDD style power ...
    schombi schombi April 2014 Hardware
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    ... /> I have knocked up a quick tiling routine which works ... and would like to attempt a sprite routine/engine.
    a time). Also a table to reverse a byte depending ... while coding it. A general overview if you ... backbuffer, it will be a flip screen game (also ...
    polomint polomint November 2014 Development
  • ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…

    ... - which may be quite a surprise, as they can be ... from the speed that we flip between these 0s and ... sent to tape have a longer "flip period" than 0s do ... , and so 1s sound a lower ... that 8 times gives us a byte.

    And that' ...
    Dunny Dunny September 2003 Emulators
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... other games run with a zero flip-flop):
    < ... br /> .org 0
    .byte ;I register, points to rom ... I was off by a byte.
    ; All ... a
    sla a
    sla a
    sla a
    sla a ...
    Erlstoned Erlstoned August 2004 Development
  • rom switchhow could one go about building a rom switch, to switch between +3 roms and +3e roms.

    ... (caught in the middle of a byte fetch from ROM).
    The ... way to switch is a gated flip/flop through a in/out port ...
    Marcelo Marcelo February 2006 Hardware
  • rom switchhow could one go about building a rom switch, to switch between +3 roms and +3e roms.

    ... (caught in the middle of a byte fetch from ROM).
    The ... way to switch is a gated flip/flop through a in/out port ...
    piters piters February 2006 Hardware
  • rom switchhow could one go about building a rom switch, to switch between +3 roms and +3e roms.

    ... (caught in the middle of a byte fetch from ROM).
    The ... way to switch is a gated flip/flop through a in/out port ...
    Dr BEEP Dr BEEP February 2006 Hardware
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... characters ending in a '0' byte). "strlen()" is a well-known function ... address of the terminating '0' byte in the string.
    < ... s. itoa() also appends a terminating "0" byte. In other words, ... Now suppose we want to flip a weighted coin that comes up ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Best way to organise a multi screen game?Hi All, Does anybody know ay good ways to organise large multi screen game? Or any links to useful texts on the matter? In my previous single scr…

    ... procedural map engine for a planed Adventure/RPG. This ... save 4 tiles in a byte, and after this screen ... has been written to a buffer, the procedural ... 64 or 32 Tiles. A flip-screen map of 256x256 ... I was also thinking about a fractal screen compressor (with ...
    LCD LCD May 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…

    ... line by line (or byte by byte) and redraw it at ... really easy, especially for a pre-shifted XOR routine. ... , then use EXX to flip them into the alternate register ... the new sprite. Draw a byte or line of one sprite ... can keep checking the byte at 23672 to see ...
    jonathan jonathan August 2011 Development
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ...
    Given the Z80 has a rather leisurely 280ns cycle, and ... You'll need to buffer a byte somewhere (either for the video ... complete memory reads during a Z80 M1 cycle, one ... read in an octal flip flop then the read ... an FPGA to make a system-on-a-chip, and FPGAs ...
    Winston Winston October 2012 Hardware
  • Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…

    ... the end of each line flip. The stack register (SP) is ... address. You could save a byte with a direct write to an address ... ).

    [CODE]Full screen flip

    attrs ld hl ... ,(hl)
    ld (hl),a
    ld a,(bc)
    ld (de ...
    jamorski jamorski September 2013 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... on
    LD A,(BC) ; read map data byte
    LD HL ... jumptable data
    LD L,A ; flip A to L
    JP (HL ...
    MatGubbins MatGubbins March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ...
    LD A,(BC) ; read map data byte
    LD ... jumptable data
    LD L,A ; flip A to L
    JP ... the jump table is high-byte aligned. However, that ...
    bobs bobs March 2014 Development
  • Edge Connector InformationHi Everyone, Hope I'm posting in the correct forum. I've recently been playing with an Arduino and got to thinking it would be fab if I could do so…

    ... if the CPU is writing a data byte on the data bus ... or input device must supply a byte of data on the data ... a single byte. There are a number of names for this, including "latch", "flip ... , or the CPU writes a different data byte to it. Not only ...
    1024MAK 1024MAK April 2014 Hardware
  • Edge Connector InformationHi Everyone, Hope I'm posting in the correct forum. I've recently been playing with an Arduino and got to thinking it would be fab if I could do so…

    ... about making a connector that would latch a byte on a chip like ... another Speccy as inputs via a couple of joystick connectors. ... even use a FIRE bit as a flip-flop alongside each byte written ... .

    Question - on a 48K joystick interface, the joystick ...
    joefish joefish April 2014 Hardware
  • ANNOUNCE: SPECSAISIE 1.2 released!SPECSAISIE is a Java system which enables one to perform surgery on SNA and TAP files, and various other gubbins (some functions relate to Spectrum e…

    ... br /> + Peek: Print the byte-value(s) stored in an ... br /> + Poke: Write a byte-value into a specified address.
    - Compare ... : Compare two SNA files byte-by-byte ... add up all the byte values between specified intervals.
    andrewbroad andrewbroad January 2003 Emulators
  • ANNOUNCE: SPECSAISIE 1.2 released!SPECSAISIE is a Java system which enables one to perform surgery on SNA and TAP files, and various other gubbins (some functions relate to Spectrum e…

    ... br /> + Peek: Print the byte-value(s) stored in an ... br /> + Poke: Write a byte-value into a specified address.
    - Compare ... : Compare two SNA files byte-by-byte ... add up all the byte values between specified intervals.
    andrewbroad andrewbroad January 2003 Games
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... the Z80 reads a byte b from the data ... 3 tstates: read low byte from the interrupt vector.
    byte and jump to interrupt routine ... M2: 3 tstates: write high byte and decrement SP.
    * ... : 4 tstates: read high byte of 'nnnn' and decrement ...
    Philip Kendall Philip Kendall July 2004 Development
  • Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…

    ...

    LD A,(DE) ;The leftmost byte of each
    OR ... .

    LD A,(DE) ;The leftmost byte of each background
    LD (HL),A ;byte of the previous one.
    dmsmith dmsmith September 2004 Development
  • 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…

    ... /> buclebmp2: ld c, a
    ld a, (hl) ; bring a byte
    dec hl ... ; move back
    ld (hl), a ... /> bucleattr2: ld c, a
    ld a, (hl) ; bring a byte
    dec hl ...
    na_th_an na_th_an November 2006 Development
  • Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …

    ... 2 Tile Editor incorporating a byte mirror table. The ... the contents of a single byte
    xor a ; to fill the ... /> zoom_attributes:
    ld a,($6008) ; 1st byte
    ld hl,$6000 ... /> ; ------------
    ;
    ; A 256 byte lookup table to mirror the ...
    chev chev January 2007 Development
  • IF1 Networking for GamesI'm wondering if there is some interest in coming up with some kind of if1 networking protocol for games. This would have to be a custom protocol as…

    ... medium that can function a lot like ethernet. The ... existing if1 protocol transmits a byte in 505T consisting of ... bit for eight bits, and a 145T stop period.
    ... to be running on a single network. If this ... game is managed by a master that is responsible ...
    Alcoholics Anonymous Alcoholics Anonymous March 2007 Development
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