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  • My collection for sale. Full list here!Here's the list of what I am selling. Please contact me at cheggersplayspop*@boltblue.com (remove the *) and make me an offer! TITLE PUBLISHER YEAR …

    ... Belief 1991
    Core Bug Byte 1986
    Flyer Fox Bug ... Byte 1986
    Pool Bug Byte 1983
    Pool Bug Byte 1983 ... Bulldog 1987
    Kendo Warrior Byte Back 1989
    Bionic Commando ...
    Steve B Steve B May 2004 Sales
  • Aquarius RemakeWho remembers this Bug Byte game. Was one of the earlier ones I owned. Anyway, this is just a quick plug to let you know the my remake of it is rea…

    Who remembers this Bug Byte game. Was one of the ...
    GeeKay GeeKay June 2004 Games
  • Manic Miner Tape InlaysJust a question for you, how many different inlays were there for manic miner ? I have found the Software Projects "Alien" and Bug-Byte "Miner" inlay…

    ... Software Projects "Alien" and Bug-Byte "Miner" inlays but I have ... a third inlay by Bug-Byte brown back ground with an ...
    Rapunzel Rapunzel July 2004 Games
  • Decimals, bcd etc in z80...Working bloody full-time on my Ragnar Revival game right now - just finished the basic sprite engine and before I go on coding the actual 3d engine (…

    ... 's etc) in a separate byte and then when adding and ... best be implemented as one byte for each decimal place, as ...
    ekoman ekoman July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... /> * M4: 3 tstates: read low byte from the interrupt vector.
    * M5: 3 tstates: read high byte and jump to interrupt routine ... /> * M2: 3 tstates: write high byte and decrement SP.
    * M3 ... /> * M3: 4 tstates: read high byte of 'nnnn' and decrement SP ...
    Philip Kendall Philip Kendall July 2004 Development
  • ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …

    ... : a screen and an ATTR byte). The border is 48 pixels ...
    GOC GOC July 2004 Development
  • Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …

    ... spritemove

    bit 0,(ix-126) ;Check whether sprite has ...
    ekoman ekoman July 2004 Development
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... get to receive/send the byte or do all do so ...
    GOC GOC August 2004 Development
  • Index register questionDoes anyone know whether the DD / FD prefix works on the ex de,hl instruction, ie. modifying it to ex de,ix or ex de,iy. Derek

    Does anyone know whether the DD / FD prefix works on the ex de,hl instruction, ie. modifying it to ex de,ix or ex de,iy.

    Derek
    dmsmith dmsmith August 2004 Development
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... such form: mask byte, sprite byte, mask byte, sprite byte... and so ... LD A,(DE) ;taking first byte of sprite (mask)
    ... LD A,(DE) ;taking second byte (sprite itself)
    INC ... LD B,A ;storing shifted byte for next time
    ...
    moroz1999 moroz1999 August 2004 Development
  • Calculate screenaddressWho knows where the topic about the fastest screenaddressroutine is? I can't find it in a search.. The fastest routine was to load a large table of …

    ... ,(HL) ; first part of lo-byte is X-dependent
    LD ... /> ADD A,(HL) ; Calculate Lo-byte
    INC H
    LD ... H,(HL) ; Fetch Hi-byte
    LD L,A
    Dr BEEP Dr BEEP August 2004 Development
  • 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 …

    ... , in the .SNA file format, byte 19 is designated to contain ... any other singnificance to that byte? Because in the snapshots of ... I'm using it) that byte contained a variety of values ...
    Erlstoned Erlstoned August 2004 Development
  • Character SetAlright, this may not be the right forum for this question (it does sort of relate to a game which I'm trying to get working properly - long story) -…

    ... anyone know where that 2 byte pointer is, or where I ...
    Neil^P Neil^P August 2004 Games
  • Manic MinerI was just browsing through the sinclair auctions on ebay and I came across a version of Manic Miner. It is the Bug Byte version and the seller claim…

    ... Miner. It is the Bug Byte version and the seller claims ... Rare'. I know that Bug Byte released it with two different ...
    Ian Hamilton Ian Hamilton September 2004 Games
  • Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…

    ... br /> Now take SET b, (IX+d).

    This is ... (3T) [i.e. the IX offset]
    M3: InternalOperation ... memory address, based on IX and the read offset]< ... down ?

    LD (IX+d), n

    ... DD-CB instructions, every (IX+d) instruction is exactly ...
    GOC GOC September 2004 Development
  • Checksums in Hobeta filesDoes anyone here have any experience with working with the internals of the Hobeta (aka .$b, .$c ...) file format, or failing that, checksum algorith…

    ... /> There's a checksum at byte 0x0e, which, according to [url ...
    gasman gasman September 2004 Development
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... inc hl ; Goto next byte in table
    ld ... e,(hl) ; Fetch 'last' byte in table
    prbyte ld ... a,(hl) ; Fetch byte for print
    rst 16 ... br /> jr prbyte ; Print byte from screen
    table ...
    Dr BEEP Dr BEEP September 2004 Development
  • Index register subtractionHi, Just wondering if there a way to perform SBC HL,BC on the IX or IY registers. I can't find an op code for it, and my assembler doesn't recognise…

    ... SBC HL,BC on the IX or IY registers. I can ...
    dmsmith dmsmith September 2004 Development
  • The original MaziacsThis is probably old news to most of you, but never mind! I was flicking through an old magazine (C & VG, June '82) when I noticed an advert for a Z…

    ... a ZX81 game by Bug Byte called 'MAZOGS'.

    The ...
    Blunderbuss Blunderbuss October 2004 Games
  • Claim to Speccy fameHas anybody had their name in print in a Spectrum magazine? Either on a letters page, giving a hack/cheat or printing of a type in. By the way I've…

    ... /Nov 1983 which reveals Bug Byte are releasing a new prog ...
    rich_chandler rich_chandler October 2004 Sinclair Miscellaneous
  • Star Tip 2 - Tim Follin's 3 Channel Sound - info reqd.Hello there, I've decided to throw myself in at the deep end and decipher Tim Follin's "Star Tip 2", which produced some incredible 3 channel sound …

    ... difference, #04 in the 4th byte rather than #02, so I ... an educated guess that this byte is the "speed" controller.
    nickunt nickunt October 2004 Development
  • Manic miner (yes MORE!!!!)you can also do the manic miner cheat from the retro gamer your sinclair 94 on both the css and jils 3 screen april fool versions of the game too, ji…

    ... be based on the bug byte version too
    mel the bell mel the bell October 2004 Games
  • 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…

    ... a counter instead of a byte, to keep track of menory ...
    Sokurah Sokurah December 2004 Emulators
  • Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…

    ... out to: LD B, RLC (IX+d)

    But using ... document I get RLC B, (IX+d). In the section titled ...
    vreddy vreddy December 2004 Development
  • Screen AttributesNot sure if this is a devolopment question but here goes... In my limited understanding, the 'attribute file' of a speccy is 5800h to 5AFFh and each…

    ... 5800h to 5AFFh and each byte coresponds to each character position ...
    Saboteur Saboteur January 2005 Development
  • Can anyone help?Got a bit of a recurrent problem here when it comes to duplicating the Cronosoft tapes, i was wondering if anyone can help. I'm getting loads of ret…

    ... ) until the very last bit/byte.

    I know the ...
    chaosmongers chaosmongers January 2005 Sinclair Miscellaneous
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ... LD HL,22528
    LD IX,MAP

    LD ...
    LOOP2 LD A,(IX+0)
    LD DE,COLOUR ... /> INC HL
    INC IX
    DJNZ LOOP2
    ...
    Mr Millside Mr Millside February 2005 Development
  • Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…

    ... LD C,9
    LD IX,MAINMAP
    DI
    ... PUSH DE
    LD A,(IX+0)
    LD (MAPLUMODIFY + ... /> INC E
    INC IX
    DJNZ PRTTILELOOPX
    ...
    Mr Millside Mr Millside February 2005 Development
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