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<1…9101112131415…34>
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... CPU (the CPU data bus side, not the ULA data bus side).
    ... 16 = D1 ; /* Lines from Z80 data bus */
    PIN 17 = D2 ; /* ... tristate buffer to supply keyboard data and EAR state */
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... putting EAR and keyboard data on the CPU data bus when the "ULA ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • I/O port adress map of Spectrum and interfacesI'm looking for an adress map of all the used and unused I/O ports for the ZX-Spectrum. Many years ago I designed an I/O board for the Spectrum that…

    ... alert the speccy to new data being ready it could generate ... appropriate port number on the data bus when the "control register" address ...
    guesser guesser April 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... !

    In step c data bus line D7 was high when ... something was interfering with the data bus and suspecting that an upper ...
    Zorn Zorn April 2012 Hardware
  • The most powerful 8-bit machine, and CPU?Further to the discussion in: [url]http://www.worldofspectrum.org/forums/newreply.php?do=newreply&p=621787[/url] What actually is the best 8-bit ma…

    ... and has an 8-bit data bus. Whereas the TMS9900 from the ...
    chev chev April 2012 Chit chat
  • Spectrum +3, Issue 2...I have just had plonked on my desk a nice issue 2 Spectrum +3. I'm not sure if its 100% working yet, as I have not plumbed it into a telly. So, assu…

    ... real read from the video data bus, by means of three-state ...
    BiNMaN BiNMaN April 2012 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /Amiga joystick.
    Data bus is connect with ZX bus via resistors (protection ... port return full 8 bit data value.[/QUOTE]

    During ...
    velesoft velesoft May 2012 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /Amiga joystick.
    Data bus is connect with ZX bus via resistors (protection ... port return full 8 bit data value.

    [B]This ...
    velesoft velesoft May 2012 Hardware
  • GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…

    [QUOTE=weesam;632794]a single processor can execute a single task at a single instant.[/QUOTE]

    Modern processors are somewhat more complicated than the colourful diagram an ALU and data bus in the ladybird book of computers :p
    guesser guesser June 2012 Development
  • 4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…

    ... the two halves of the data bus (the ULA half and the ... of the data bus to the ULA side of the data bus, and thus ... the two halves of the bus.

    If the ... ULA's side of the bus from the CPU (or ... the ULA half of the bus from stuff happening on the ...
    Winston Winston June 2012 Hardware
  • Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…

    ... 128K toastrack, basically the bus is much longer in the ... some extra chips on the bus) causes timing issues (some ... on the Spectrum's bus to mean that the ... t reliably drive all 8 data bus lines high by the ... time the Z80 sampled the bus (compounded by the W5100 ...
    Winston Winston June 2012 Hardware
  • Is there a DD40 instruction?On this page: [URL="http://mdfs.net/Software/Z80/Exerciser/Spectrum/zexall.src"]Z80 instruction set exerciser for Spectrum[/URL] I noticed the belo…

    [QUOTE=Patrik Rak;634506]The contrary is not entirely true, though, see EX DE,HL. :)[/QUOTE]EX DE,HL doesn't access DE or HL, it toggles a bit that directs the internal data bus to either the DE or HL register.
    Jonathan Harston Jonathan Harston June 2012 Emulators
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... CPU reads from the data bus during an INTA bus cycle. Useful, for ... interfaces that put garbage on data bus, or clones under suspect for ... not adding pullups on data bus lines ;) (you may guess why ...
    mcleod_ideafix mcleod_ideafix June 2012 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... CPU reads from the data bus during an INTA bus cycle.[/quote]Oo ...
    Jonathan Harston Jonathan Harston June 2012 Development
  • Jelly-Vision!As threatened in the "'Spectrum Play' Error" thread, here's a ruff'n'reddy interrupt driven full screen wobbling routine which has no practical use w…

    ... . Jelly-Vision relies on the data bus holding $FF when there are ...
    Battle Bunny Battle Bunny June 2012 Sinclair Basic
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... something is messing with the data bus lines and prevents the CPU ...
    mcleod_ideafix mcleod_ideafix July 2012 Hardware
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... IM2 interrupt cycle pull-up data bus via 100 Ohm resistors for ...
    velesoft velesoft August 2012 Development
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... IM2 interrupt cycle pull-up data bus via 100 Ohm resistors for ...
    Alcoholics Anonymous Alcoholics Anonymous August 2012 Development
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... Russian clones having a unstable data bus during INTA cycles, or DividePlus ...
    mcleod_ideafix mcleod_ideafix August 2012 Development
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... in same time to data bus different value (data collision)...
    Test this ... />
    So there's no data colission between the Messenger and ... affect operation because the only data bit connected to I/O ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... LED)

    The Speccy bus has an awful lot of ... 't actually drive the Spectrum bus reliably on anything but a ... with a big long winding data bus that must add a fair ...
    Winston Winston August 2012 Sinclair Miscellaneous
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... br />
    The Speccy bus has an awful lot of ... actually drive the Spectrum bus reliably on anything but ... a big long winding data bus that must add a ... that the CPU adress bus is connected using diodes ... that the CPU adress bus is now not directly connected ...
    ingo ingo August 2012 Sinclair Miscellaneous
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... actual order of address and data bus wiring for all RAM does ... /> [*]Don't mix address with data lines!
    [*]For DRAM the ...
    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…

    ... . Do the same for each data bus line from the CPU to ...
    Zorn Zorn 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…

    ... 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
<1…9101112131415…34>

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