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  • Cant DecideI have had a lot of spectrums in my time from the 16k to the +3 and as we all know they all have flaws. I am thinking about buying another and wanted…

    ... with each issue.
    Partial decoding of Kempton port causes incompatibility ... it up to use full decoding. There is no ULA in ...
    chev chev August 2010 Hardware
  • Seeking alternatives to DATA statementsAnyone know of any memory saving alternatives to storing a list of numbers, other than using DATA statements or poking data into addresses?... Im ti…

    ... are slower due to the decoding process to be performed both ...
    mcleod_ideafix mcleod_ideafix August 2010 Sinclair Basic
  • Spectrum +2 wantedLooking for a fully working Spectrum +2 Dont need any games but if you got them then they are always welcome addition. I Will need the psu and the o…

    ... crashing when you read port #7FFD. It also isn't wired ...
    chev chev August 2010 Wanted
  • ZX48K 128K modHas anyone make this mod to the ZX48K? Does it work? [URL]http://hw.speccy.cz/128krebuild.html[/URL] Micky

    ... using the spare bits in #7FFD to 512K, or even 1MB ...
    chev chev August 2010 Hardware
  • DivIDEI just missed the Ebay listing of some DivIde`s that were available ! :( I`ve contacted the seller if there are any more but have had no replies - so…

    ... lack of the joystick interfaces decoding port 31 fully.
    rwap rwap August 2010 Wanted
  • DivIDEI just missed the Ebay listing of some DivIde`s that were available ! :( I`ve contacted the seller if there are any more but have had no replies - so…

    ... lack of the joystick interfaces decoding port 31 fully.[/QUOTE]
    Alien 8 Alien 8 August 2010 Wanted
  • ZX48K 128K modHas anyone make this mod to the ZX48K? Does it work? [URL]http://hw.speccy.cz/128krebuild.html[/URL] Micky

    ... using the spare bits in #7FFD to 512K, or even 1MB ...
    velesoft velesoft August 2010 Hardware
  • Seeking alternatives to DATA statementsAnyone know of any memory saving alternatives to storing a list of numbers, other than using DATA statements or poking data into addresses?... Im ti…

    ... slow bit (3 conditions), the decoding done on Speccy (one condition ...
    kgmcneil kgmcneil August 2010 Sinclair Basic
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... Pentagon machines use only port 7FFD + modern Pentagon 1024 ... 2[/B]
    [U]port 7FFD: (adressation 0xxxxxxx xxxxxx0x )[/U]
    [U]port 7FFD: (adressation 01xxxxxx xxxxxx0x )[/U]
    [U]port 7FFD: (adressation - 01xxxxxx xxxxxx01 )[/U ...
    velesoft velesoft August 2010 Hardware
  • Using Interface II joystick in kempston-only gamesHi everyone! It's me again, bothering you with new crazy ideas :) I have recently acquired an Amstrad +2A Speccy with a joystick and built-in Interf…

    ... for games that use lazy decoding
    * in most cases you ...
    chev chev August 2010 Hardware
  • Using Interface II joystick in kempston-only gamesHi everyone! It's me again, bothering you with new crazy ideas :) I have recently acquired an Amstrad +2A Speccy with a joystick and built-in Interf…

    ... for games that use lazy decoding
    * in most cases you ...
    velesoft velesoft August 2010 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... 128 = same function as OUT 7FFD,1/5/7. Adressation of ... port 7FFD is identical with ZX Spectrum ... both paging ports 1FFD and 7FFD then will better use access ... 1FFD as first and OUT 7FFD as second. It's good ...
    velesoft velesoft August 2010 Hardware
  • SpecOS progressOk, As you can all see, I'm back - and I've been working away on SpecOS for a while now. There's a few videos, which you can see on my blog: [url]h…

    ... down by the partial port decoding? In fact, how do ports ...
    Arjun Arjun August 2010 Sinclair Miscellaneous
  • SpecOS progressOk, As you can all see, I'm back - and I've been working away on SpecOS for a while now. There's a few videos, which you can see on my blog: [url]h…

    ... down by the partial port decoding? In fact, how do ports ...
    Dunny Dunny August 2010 Sinclair Miscellaneous
  • Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …

    ... expect that would have involved decoding address lines looking for certain ...
    guesser guesser August 2010 Hardware
  • Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …

    ... . Bit D4(rom) on port 7FFD will yet compatible with orig ... of bit D4 on port 7FFD.
    velesoft velesoft August 2010 Hardware
  • MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…

    ... also rom paging on port 7FFD)
    - zx rom switching (connect ...
    velesoft velesoft September 2010 Hardware
  • it's only an electrical item.. but stillafter MANY years (maybe 18?) , my tv just popped.. when I say many years, I've had this tv since the days of Snes.. just prior I remember playing mad…

    ... say you can see encoding/decoding issues with corrupt groups of ...
    ZnorXman ZnorXman September 2010 Chit chat
  • it's only an electrical item.. but stillafter MANY years (maybe 18?) , my tv just popped.. when I say many years, I've had this tv since the days of Snes.. just prior I remember playing mad…

    ... say you can see encoding/decoding issues with corrupt groups of ...
    dm_boozefreek dm_boozefreek September 2010 Chit chat
  • ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…

    ... like:
    [QUOTE]The Memory decoding for the high memory isnt ...
    spodula spodula September 2010 Hardware
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... 6502 did all its instruction decoding using nothing other than combinatorial ...
    Winston Winston September 2010 Chit chat
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... 6502 did all its instruction decoding using nothing other than combinatorial ...
    Matt_B Matt_B September 2010 Chit chat
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... 6502 did all its instruction decoding using nothing other than combinatorial ...
    BloodBaz BloodBaz September 2010 Chit chat
  • DIVIDE games crashingMy DIVIDE arrived today complete with 512K CF Card, ready to go. First impressions, really good - simple file browser works fine & games load no prob…

    ... + R - software reset (without OUT 7FFD)
    SS + T - eject selected ...
    velesoft velesoft September 2010 Hardware
  • DIVIDE games crashingMy DIVIDE arrived today complete with 512K CF Card, ready to go. First impressions, really good - simple file browser works fine & games load no prob…

    ... #00 to memory paging port #7FFD on ZX128/+2/+2A/+3 ...
    velesoft velesoft October 2010 Hardware
  • DIVIDE games crashingMy DIVIDE arrived today complete with 512K CF Card, ready to go. First impressions, really good - simple file browser works fine & games load no prob…

    ... #00 to memory paging port #7FFD on ZX128/+2/+2A/+3 ...
    daznic daznic October 2010 Hardware
  • Alien8 will not run on Divide?I can't seem to get Alien8 running on my 128+ with Divide. I have the original tape and have loaded into an emulator to create a snapshot, (.z80) an…

    ... #00 to memory paging port #7FFD on ZX128/+2/+2A/+3 ...
    velesoft velesoft October 2010 Hardware
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... bits wide to simplify instruction decoding and the pipeline.
    * Pipelined ...
    Winston Winston October 2010 Development
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... im working on the instruction decoding and control, its comming along ...
    IF control
    Instruction decoding/ signal control
    Memory
    Robin Robin October 2010 Chit chat
<1…14151617181920…34>

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