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  • 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, ... the return address of the interrupt handler. Firstly, if the ... would seem simpler in the interrupt acknowledgement not to deal ...
    For NMI and maskable interrupt acknowledgement, it contains:

    zub zub March 2014 Hardware
  • InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…

    ... 256+1 to store its interrupt service routine address. A ... z80 reads whatever is floating on the bus at the time, ... odd peripheral ids means that interrupt service routine addresses overlap ... call address $fefe whenever an interrupt occurs in im2.
    < ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... simply stating each machine's floating point representation in a ... compared to the thousands of floating point operations inside the ... may also suffer from some bus contention caused by video ... regular code. And basic's interrupt routine consumes another 1.4 ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Sinclair Basic
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... the Spectrum.
    When an interrupt occurred the Z80 would jump ... 255 is used the bus is left floating and will pick up ...
    Jimmy Jimmy June 2008 Games
  • 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…

    ... level, or are some floating?[/QUOTE]
    Original old ... Do they all use bus mice with a 9 ... , Amiga and BBC Micro bus mice)?[/QUOTE]
    Russian ... br /> AMX MOUSE make interrupt for CPU, driver must ... small and fast routine under interrupt.
    K-MOUSE drivers ...
    velesoft velesoft March 2013 Hardware
  • Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…

    ... data on the address bus connections is floating (unconnected), but when ... not inadvertently respond during an interrupt (the Z80 CPU drives ... it is responding to an interrupt).

    Some ... from the bus), neither low or high, but “floating”, hence ...
    1024MAK 1024MAK January 2014 Hardware
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... , Kempston mouse and joystick schematics floating around which are not the ... the upper part of the bus), but there are clearly exceptions ... joystick line is on a “bus” and shares a pullup resistor ... the role of /M1 for interrupt acknowledgement. I gather there’s ...
    zub zub June 2015 Emulators
  • New Version of MAME Emulator out with enhancements on Spectrum-EmulationNew Version 0.216 of MAME Emulator out with enhancements on Spectrum Emulation: [url="https://www.mamedev.org/?p=476"]https://mamedev.org/?p=476[/…

    ... ; spectrum.cpp: Improved emulation of bus contention. [holub]
    - 9622: ... ]
    - 9637: spectrum48.cpp: Fix “floating” interrupt. [holub]
    - 9640: spec128.cpp ... br /> - 9670: spec128.cpp: Completed bus contention emulation for Spectrum 128 ...
    Luzie Luzie May 2022 Emulators
  • ANN: Write Spectrum Games in C with speclib121 Announcing the sprite pack C library for the z88dk C cross compiler available from: [url="http://justme895.tripod.com/main.htm"]http://justme895.tr…

    ... . The second is ten windows floating around). The third is a ... experiment in registering a C interrupt service routine. The final one ...
    Alcoholics Anonymous Alcoholics Anonymous January 2003 Announcements
  • 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…

    ...
    * An interrupt cannot occur immediately after ... M1: 7 tstates: acknowledge interrupt and decrement SP.
    * ... bus, it takes 19 cycles:

    * M1: 6 tstates: acknowledge interrupt ... retriggered interrupt.

    Non-maskable interrupt (NMI ...
    Philip Kendall Philip Kendall July 2004 Development
  • Interrupt driven code at overclocked pace....Is it possible for a MC coder to do a routine (i.e. interrupt music player, for within/during Basic)if he knows said machine is running at 400 percen…

    ... do a routine (i.e. interrupt music player, for within/during ...
    CKay CKay August 2004 Sinclair Miscellaneous
  • Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?

    How long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
    Philip Kendall Philip Kendall February 2005 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
  • Floating point representationI'm planning on picking up the [url=http://matt.west.co.tt/category/spectrum/openzxrom/]OpenZXRom[/url] project from where I left off a few months ba…

    ... the Speccy ROM's floating point routines is welcome ... in)...

    Normally, floating point numbers on the Spectrum ... represented in the standard floating-point notation with complete ... is converting integers to floating-point notation immediately on ...
    gasman gasman October 2006 Development
  • Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…

    ... because I already have a bus breakout board for breadboarding, and ... can be used as an interrupt controller, and it has a ...
    Winston Winston November 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
  • 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…

    ... *our* device has caused an interrupt (otherwise ignored)
    - 0x0066 - only ... CALL instruction on the data bus (i.e. decode CALL plus ...
    Winston Winston December 2007 Hardware
  • "Floating" AY registersWhile I was working on some AY sample-related stuff, it occurred to me that with the AY port not being completely decoded, it would be a handy CPU-ti…

    ... written to the data/address bus are ignored, but can be ...
    gasman gasman December 2008 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
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... 3 years at least floating round the toyroom taunting ... ... the first test was a bus test, this tells the pseudo ... A14 error. With the bus test passing I moved on ... that the databus and address bus were fine, or at ... least the address bus up to the lines required ...
    Womble Womble August 2010 Hardware
  • BASin floating point issue...Hi Folks, I have been very happy with BASin and found it to be an excellent tool. However, in the last few days a strange error has started to occu…

    ... that there has been "Invalid floating point operation". This is not ...
    Paddy Coleman Paddy Coleman September 2010 Emulators
  • BASin floating point issue...Hi Folks, Reposting here as I think I put it in the wrong section before - sorry. I have been very happy with BASin and found it to be an excellent…

    ... that there has been "Invalid floating point operation". This is not ...
    Paddy Coleman Paddy Coleman September 2010 Sinclair Basic
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... there was weakness driving the bus, in other words that ... the ULA puts on the bus wasn't sufficiently strong ... ULA's side of the bus). The buffer connects KB0 ... goes out onto the data bus.

    To make ... me to put the circuit "floating" on top of whatever ...
    Winston Winston October 2010 Hardware
  • 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
  • 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
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