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<1234567…34>
  • RST 16 with TASMCan any body tell me what is wong when I assemble this test code with TASM : ;print a long string "help me" start .org 32000 ld a,2 call 5633…

    ... ,(de)
    inc de
    RST 16
    jr loop
    RST 16

    Is it ...
    Steve(spt) Steve(spt) April 2004 Development
  • ZX-BUS?Hmmmm..... While reading Your posts here, I have an impression that various models of ZX Spectrum have various zx-bus ports. Is that true? I knew t…

    Hmmmm..... While reading Your posts here, I have an impression that various models of ZX Spectrum have various zx-bus ports.
    Is that true?
    I knew that ZX81 and Speccy have different zx-bus ports, but various models of Spectrum too??
    Yerz Yerz May 2004 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... processor simply executes an RST 38 instruction if an ... bytes onto the data bus at random times, which ... the idle bus value (0xff), coincidentally the opcode for RST 38, ... bytes onto the data bus means a random opcode ... there is a RST n on the data bus, it takes ...
    Philip Kendall Philip Kendall July 2004 Development
  • Bus Shelter DestroyerI have just uploaded another entry for the comp.sys.sinclair crap games competition 2005 that I've knocked up in record time tonight - Bus Shelter De…

    ... up in record time tonight - Bus Shelter Destroyer!

    Once ...
    BigBadMick BigBadMick April 2005 Games
  • Where can I get a bus-splitter cable?I no longer require a bus-splitter cable.

    I no longer require a bus-splitter cable.
    chev chev November 2005 Hardware
  • question about RST 10hhow do you set the position of the text when using 'RST 10h' to print to screen?

    how do you set the position of the text when using 'RST 10h' to print to screen?
    madvanman madvanman May 2007 Development
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... memory contention and floating bus stuff in ZXDS and ... to appear on the floating bus.

    To ... as far as the floating bus is concerned, the very ... seem to appear on the bus several cycles later. The ... tech doc[/URL] about floating bus.
    Ramsoft's [URL ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…

    ... off the edge connector traps RST #8. For instance, the ... with 0x0008 on the address bus). It also traps 0x0700 ... ROM to avoid the bus being crowbarred by two ... to trap something other than RST#8. (Does the ... hardware jumper that disables RST#8 traps and instead ...
    Winston Winston October 2007 Hardware
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... most of the address bus to facilitate bus indirect mode. According to ... supports two parallel modes - bus direct mode (where the chip ... or buffers.

    Bus direct mode's advantage is ... do two LDIRs if necessary). Bus direct mode means accessing registers ...
    Winston Winston November 2007 Hardware
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... exact info about the floating bus behavior and timing. An explanation ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ... jumper is closed (allowing RST 8 traps to be enabled ... exits, except for the RST 8 trap which does an ... CALL instruction on the data bus (i.e. decode CALL ... there, and do the RST 8 style trick of ... disassembly" especially with regards to RST 8 traps.

    Winston Winston December 2007 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... wants to initiate a bus cycle that might affect ... can only read FFh (floating bus).

    Convinced ... add a,7
    PrintLN rst #10
    ret
    ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • +3 BASIC and RST 8I've been working on adding commands to the BASIC interpreter, in a similar style to how Interface 1 does it (catch the RST 8 error trap). This works…

    ... 1 does it (catch the RST 8 error trap). This works ... 48k, a 128k (in either RST 0 or in the 128 ... under 48K BASIC or in RST 0 mode.

    But ...
    Winston Winston February 2009 Development
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... than 0xff on the data bus at interrupt time, thus meaning ...
    Philip Kendall Philip Kendall March 2009 Hardware
  • Z80 Expander Bus ControllHello there my fellow forum chummies, I would like to ask a few technical questions, Now I come from an Amiga Hardware based background, and as yo…

    ... /> [list]
    [*]How is this bus regulated?
    say I have ... interfere with the Z80 expansion Bus
    [/list]

    okay ...
    Zetr0 Zetr0 June 2009 Hardware
  • Bubble Bus SoftwareI'm wondering why Infoseek has this down as "Bubblebus Software", when it's "Bubble Bus Software" on cassettes & adverts. Or, to be even more accurat…

    ... Software", when it's "Bubble Bus Software" on cassettes & adverts ... it's either "bubble bus" or "bubble bus software" in titles, and ... />
    The other Bubble Bus MIA, Curse of the Crown ... sale, probably because Bubble Bus ceased trading during that year ...
    Battle Bunny Battle Bunny July 2009 Infoseek database
  • DIVIDE PLUS - ZX bus protectorI make new ZX BUS PROTECTOR for use with DIVIDE PLUS interface. This is very small "convertor" for connection to new ZX BUS connector. PCB contain on…

    ... for connection to new ZX BUS connector. PCB contain only ... possible connect to new ZX BUS any interface (interface 1, ... for direct connection to ZX BUS on ZX Spectrum. Can ... .speccy.cz/other/zx-bus-for-divide-plus-fixed ... .speccy.cz/other/zx-bus-for-divide-plus-fixed ...
    velesoft velesoft November 2010 Hardware
  • Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…

    ... are:
    1) is floating bus present on all of 128 ...
    Fikee Fikee November 2010 Development
  • Hustler (Bubble Bus)According to an article in Pop.Com.Weekly (21.Jun.84, front page) Hustler was re-released in the UK as Minnesota Fats' Pool Challenge (although proba…

    ... are expected soon"). Apparently Bubble Bus licensed HesWare to sell the ... slightly unusual situation, as Bubble Bus were still selling the game ...
    Battle Bunny Battle Bunny April 2011 Infoseek database
  • Expansion bus questionsHi, two questions about expansion bus, sorry if they have been replied before, I tried to find replies but all my keywords lead to tons of threads O…

    ... />
    two questions about expansion bus, sorry if they have been ... /> 1) Is there any zx bus splitter hardware design avaliable? Any ... that plugs into the zx bus, and provides several connectors (same ...
    Uto Uto April 2011 Hardware
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…

    ... the main ROM, not floating bus (ULA/FFh), of a mirror ...
    ld (5cedh),hl
    rst 8
    db 32h ;CALL ...
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • SAM BUS for SAM COUPEOne PCB for SAM BUS interface for sale (only PCB + RTC 72421A) PCB is old, but unused. Price is 20 EUR + 5 EUR postage Info about SAMBUS: [url]htt…

    One PCB for SAM BUS interface for sale (only PCB + ...
    velesoft velesoft August 2012 Hardware
  • Using RST 16 and udg flickerHi there! I'm using UDGs and RST 16 to make a simple canyon bomber game. I've got the game mechanics working ( finally ) but now I'd like to make …

    ... /> I'm using UDGs and RST 16 to make a simple ...
    Atari_Jetman Atari_Jetman October 2012 Development
  • New ZX BUS PROTECTOR / +3 FIXER BOARDNew version of ZX BUS PROTECTOR: [URL="http://velesoft.speccy.cz/protector.htm"]http://velesoft.speccy.cz/protector.htm[/URL] [IMG]http://velesoft.s…

    New version of ZX BUS PROTECTOR:
    [URL="http://velesoft ... velesoft.speccy.cz/other/zx-bus-protector/IMGP6977-protector-universal-romoe1top ... php?t=31925&highlight=bus+protector"]http://www.worldofspectrum.org ... php?t=31925&highlight=bus+protector[/URL]
    velesoft velesoft August 2013 Hardware
  • Connectors for ZX BUSHere is photos of three different versions of connectors used on ZX interfaces: As you can see, each connector use different shape of contacts. Firs…

    ... /> Thickness of ZX board (system bus connector) is about 1.5 ...
    velesoft velesoft October 2013 Hardware
  • Emulating a +2A with floating bus modBefore I start hacking Fuse's source... Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.ro/html/plus…

    Before I start hacking Fuse's source...

    Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.ro/html/plus3_hardware.html#inFFport"]floating bus modification[/URL]?

    -Stephen
    stephenw32768 stephenw32768 October 2013 Emulators
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... 's placed on the address bus during execution of HALT, beyond ...
    zub zub March 2014 Hardware
  • RST hooks in OpenSE BASICHi, any possibility of OpenSE BASIC having RST vectors rewired to a small table in RAM containing jumps back to apropriate ROM locations? :grin: It i…

    ... possibility of OpenSE BASIC having RST vectors rewired to a small ...
    tstih tstih May 2014 Development
  • bubble bus[url]http://www.worldofspectrum.org/infoseekid.cgi?id=0011630[/url] was never released, that comes direct from the owner .. "we never put out any ad…

    ... , prior to being called bubble bus , it was known as "the ...
    fog fog June 2014 Infoseek database
<1234567…34>

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  • ZX-BUS?Hmmmm..... While reading Your posts here, I have an impression that various models of ZX Spectrum have various zx-bus ports. <br /> Is that true? <br…
  • Bus Shelter DestroyerI have just uploaded another entry for the comp.sys.sinclair crap games competition 2005 that I've knocked up in record time tonight - Bus Shelter De…
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