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Search Again :: Adv Search 1000 results in 0.045s
<1…21222324252627…34>
  • Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…

    ... . Do the same for each data bus line from the CPU to ...
    Zorn Zorn August 2012 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... (I'm afraid that the data bus lines of this ULA might ... : accurate timmings as per Chris data, Timex HiColour mode, and ULAPlus ...
    mcleod_ideafix mcleod_ideafix August 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... (I'm afraid that the data bus lines of this ULA might ... : accurate timmings as per Chris data, Timex HiColour mode, and ULAPlus ...
    ANDREW RYALS ANDREW RYALS August 2012 Sinclair Miscellaneous
  • Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…

    ... least, every part of the data bus including the DRAM chip inputs ...
    1024MAK 1024MAK August 2012 Hardware
  • Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…

    ... off the data bus is just the undriven bus (which is ... hardware (to supply any data) with any Spectrum that ... " the two parts of the data bus.

    If ... each line on the data bus goes to a different ... would have expected some data lines to work correctly.< ...
    1024MAK 1024MAK August 2012 Hardware
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    ... that it's in the data bus. This would explain the bizarreness ... the IORQ line and a data line but it all seems ...
    Spirantho Spirantho August 2012 Hardware
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    ... that it's in the data bus. This would explain the bizarreness ... expect any problems with the data bus to stop anything working at ...
    guesser guesser August 2012 Hardware
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    It may not be the data bus or the Z80 I/O ... 2, maybe it is the data bus pins here you need to ...
    1024MAK 1024MAK August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... ULA's half of the data bus when looking in from the ...
    Winston Winston September 2012 Hardware
  • Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …

    ... on-board.
    * All ZX bus digital signals routed to CPLD ... />
    For the XC9572XL, the data bus and upper half of address ... bus goes to the CPLD's ... lower half of the address bus and CPU control signals go ...
    Winston Winston October 2012 Hardware
  • Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …

    ... on-board.
    * All ZX bus digital signals routed to CPLD ... />
    For the XC9572XL, the data bus and upper half of address ... bus goes to the CPLD's ... lower half of the address bus and CPU control signals go ...
    Black_Cat Black_Cat October 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... bursts of activity on the data bus, which must have been due ... 's reading of the display data. I confirmed that that CPU ...
    Zorn Zorn October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... coloured vertical stripes for each bit, starting with D0 and ending ... to that particular bit (in my case, bit 6 and probabily bit 7).
    bit 6, but instead the border becomes ... between a write failure of bit 6 and a missing RAM. Any ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... outputs with their own data: a 137 bit sequence that configurates a ...
    mcleod_ideafix mcleod_ideafix October 2012 Hardware
  • 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 …

    ... , the Z80 only samples the bus right at the end of ... the Z80 actually samples its data bus. (I have some simple LCD ...
    Winston Winston October 2012 Hardware
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... not very reliable anyway, because bit 6 may change value in the ...
    Einar Saukas Einar Saukas November 2012 Sinclair Basic
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... in bit 6.
    [code]
    IN: Reads keys (bit 0 to bit 4 ... 0xeffe 0, 9, 8, 7, 6
    0xfdfe A, S, D ...
    ub880d ub880d November 2012 Sinclair Basic
  • Cycle exact emulation?I was just reading the thread about +3 emulation having different results on different emulators, and it made me wonder if any Spectrum emulators hav…

    ... think of is the magic bus effect. As far as I ... values on the address and data bus are read from one location ... as are present upstream on bus.
    Again, this is something ... actual signals at the bus level so data doesn't just get ...
    guesser guesser November 2012 Emulators
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... 664294][LIST][*]Input port $FE bit 6 (when there's no ... /> [*]"TK90X model 1": "floating" bit, usually value "1";
    [*]"TK90X ... using a TK95 indicate that bit 6 from input port $FE ... is followed by IN returning bit 6 equals 0), and this interference ...
    Einar Saukas Einar Saukas November 2012 Emulators
  • HxC Floppy Drive Emulator - help neededHi! I?m really having difficulties with my new HxC SD card floppy emulator on a Spectrum +3. It?s REV C cased light gray, with no labels on it, so I…

    ... /> [CODE]

    2 4 6 8 10 12 14 16 ... /> 5 READ DATA 22 GND
    ______________
    6 D4 23 DRIVE ...
    __________
    13 WRITE DATA 30 GND

    14 ...
    1024MAK 1024MAK November 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... +,KEMPAY,...) or connect kempston data with ZX data bus via resistors 100-150 ... output signal /RESET on system bus (reset will only output, external ...
    velesoft velesoft December 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... +,KEMPAY,...) or connect kempston data with ZX data bus via resistors 100-150 ... output signal /RESET on system bus (reset will only output, external ...
    antoniovillena antoniovillena December 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... .. If you connect kempston data with ZX data bus via resistors, then will ...
    velesoft velesoft December 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... .. If you connect kempston data with ZX data bus via resistors, then will ...
    antoniovillena antoniovillena December 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... both devices send different data values on Z80 data bus = data collision.

    data bus

    Good way can ... be - connect internal AY data to Z80 data bus via resistors (this enable ...
    velesoft velesoft December 2012 Hardware
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... because on +2a/+3 models, bit 6 read from port #FE is ...
    Metalbrain Metalbrain December 2012 Games
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