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Search Again :: Adv Search 1000 results in 0.016s
<1…10111213141516…34>
  • 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 warmed up, the OUT data went bad, and it flipped ... OUT command is having its data corrupt. This could explain the ... /> But what could cause the data bus to go bad after it ... IO, and not affect the data from the RAM to the ...
    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. …

    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
  • 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…

    ... splatter, continuity and shorts everywhere. Bus signals can be found everywhere they ...
    Falco-F8L Falco-F8L 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 …

    ... that the CPU samples the data bus.
    Winston Winston 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 memory address on the bus for quite extended time, but ... long enough time for the data bus lines to settle down before ...
    Patrik Rak Patrik Rak October 2012 Hardware
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... leaves a "residual sign" on data bus when accessing the video memory ... leaves a "residual sign" on data bus when accessing the video memory ...
    Einar Saukas Einar Saukas November 2012 Emulators
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    Just to mention:
    Somewhere I read not long ago, that while the CPU is performing internal operations (i.e. it's not using the external buses), the data bus outputs whatever it's hapenning in the internal 8-bit Z80 bus
    mcleod_ideafix mcleod_ideafix November 2012 Emulators
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    [QUOTE=mcleod_ideafix;666807] the data bus outputs whatever it's hapenning in the internal 8-bit Z80 bus[/QUOTE]

    Gah. Now I'm going to have to get out the high speed pod for my logic analyzer again to test this...
    Winston Winston November 2012 Emulators
  • 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
  • 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…

    ... of collision on data bus (we can connect data bus between CPU and ... superfo logic via resistors and data ... between CPU and ZX bus connect 1: ... new IORQGE signal on ZX bus (reserved for future)
    ...
    velesoft velesoft December 2012 Hardware
  • Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…

    ... , ROM video routines 'execute' character data in 8000-FFFFh area (A15 ... forces 0's on the data bus so that the Z80 sees ... parts of the address bus, and reads graphic data from the ROM ...
    RetroTechie RetroTechie January 2013 Chit chat
  • Spectrum +2A/B - CPU affects loading??Hi everybody, Here's something I don't understand. A +2A came in the other day, and it was working fine, but wouldn't load some tapes. OK, thinks I…

    ... colours for the loading of data?[/QUOTE]

    That's ... loading usually means that the data bus might suffer from corruption or ... any device that shares its data lines with CPU: Gate Array ...
    mcleod_ideafix mcleod_ideafix January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... 48kB then ZX can crash = data collision between internal dram chips ... chips can send different data values to same data bus and CPU can ...
    velesoft velesoft January 2013 Hardware
  • A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…

    ... .7?A !!! leakage on the data bus and 1 (one) !!! standard CMOS ...
    Dan Antohi Dan Antohi January 2013 Announcements
  • Microcontrollers and the SpectrumBeing unusually busy lately, I didn?t get a chance to comment at the time on a remark in an older thread, but I shall take the liberty of doing it no…

    ... Slave Port?, composed of: 8 data (3-state), 2 address and ... to some other system?s data bus.[/QUOTE]
    My PS/2 ... . It is capable of supplying data in just the time the ...
    mcleod_ideafix mcleod_ideafix January 2013 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... in same time send data to system bus...[/SIZE][/FONT][/QUOTE]
    data bus :sad:

    [I][B ...
    1024MAK 1024MAK January 2013 Hardware
  • Which type of Z80 cpu to use with ZX 48?Which type of Z80 cpu can I use with ZX 48? Only the 4 MHz cpu's or some with more MHz? Did not know if a 6 MHz cpu runs in a ZX 48 with 4 MHz. Mic…

    ... the video half of the data bus being separated by nothing but ...
    Winston Winston February 2013 Hardware
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... mapping between the Spectrum's data bus and the printer port is ... are marked on the Spectrum bus, too, in that schematic, but ... , D5 on the Spectrum's data bus. Bit D5 of that port ...
    zub zub February 2013 Hardware
  • Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…

    ... end up trashing all your data located before it.
    data bus colides with the Z80 data bus, as both ... a value on the data bus. What will happen if ... Z80 puts 00h (your data being written) and the ... will introduce a bus colission with every data line. For ...
    mcleod_ideafix mcleod_ideafix February 2013 Sinclair Miscellaneous
  • PlusD Mini: implementing the CPLDI am doing my first attempts on creating a CPLD to use as replacement for the PlusD's GAL (and other logic lateron). I use the Xilinx XC9500XL series…

    ... with both f17 and zxrom signals.
    I am not sure ... to the ZX Spectrum's bus signals, allthought the chip is fed ...
    bverstee bverstee February 2013 Hardware
  • PlusD Mini: implementing the CPLDI am doing my first attempts on creating a CPLD to use as replacement for the PlusD's GAL (and other logic lateron). I use the Xilinx XC9500XL series…

    ... to the ZX Spectrum's bus signals, allthought the chip is fed ...
    Winston Winston February 2013 Hardware
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... before the Z80 samples the data bus for execution at that address ... 0x0001, and found that the data retrieved by the Z80 for ...
    zub zub February 2013 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…

    ... separated inputs, form the address bus contents.

    ... high. Then the address bus content fetching is initiated ... there's no separated data bus for VRAM and Z80 ... I/O data. For the ULA to ... that time, the address bus contents are not available. ...
    mcleod_ideafix mcleod_ideafix March 2013 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…

    ... separated inputs, form the address bus contents.[/QUOTE]

    data bus for VRAM and Z80 I ... /O data. For the ULA to ... that time, the address bus contents are not available. ... complete 16 bit address bus to the ULA, and ...
    Mr X Mr X March 2013 Hardware
  • Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …

    ... bus fault. This is where there is a problem with the data ... to check that each data line from the Z80 ... 470 ohm resistors. Each data line from the Z80 CPU ... one RAM chip (the data bus uses the 470 resistors to ... line, all the other data lines. You are expecting ...
    1024MAK 1024MAK March 2013 Hardware
  • Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…

    ... interrupt set pull-up on data bus and CPU read always #FF ...
    velesoft velesoft March 2013 Hardware
<1…10111213141516…34>

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