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<1234567…34>
  • ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…

    ... level encoded. If the ZX81 loader is edge-triggered, we really don ...
    Philip Kendall Philip Kendall September 2003 Emulators
  • RealXThis may be a dumb question but will RealX ever get released?

    ... ULA immediately after the rising edge of the Z80, which is ... moved the trigger on the falling edge of the clock. Could this ...
    Luca Luca August 2006 Emulators
  • RealXThis may be a dumb question but will RealX ever get released?

    ... moved the trigger on the falling edge of the clock. Could this ...
    Woody Woody August 2006 Emulators
  • for a stupid: what?s NMI?erhm, yes, I?m not familiar with it... :rolleyes: I know the function of a hardware ?snapshot? button from Didaktik M/Kompakt, but I?m not familiar…

    ... several books.

    The edge triggering is a subtle difference ... flop is triggered on the falling edge of the /NMI pin and ...
    Alcoholics Anonymous Alcoholics Anonymous August 2006 Hardware
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... we have marko's universal loader, which doesn't do ... all - it examines the loader to see what it [ ... If a loader cannot be fastloaded, it reverts to edge mode, ... .

    Both Edge and Fast utilise a faster ... br />
    The loader that edge mode can't pick up ...
    Dunny Dunny November 2006 Emulators
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... DRAM in sight. On the falling edge of RFSH, you are guaranteed ...
    Winston Winston March 2007 Sinclair Miscellaneous
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... ), can be triggered by a falling edge on another z80 pin and ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Development
  • Making your own joystick interfaceJust spied the diagram for the kempston joystick interface in the docs section. For someone who has only made up cables, what is involved in constru…

    ... , and data latched on the falling edge of enable, which is exactly ...
    Winston Winston June 2007 Hardware
  • Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…

    ... NMI is triggered by a falling edge). When you let go of ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Hardware
  • Problem with replacing all upper memory with 4164 chipsGuys, i have a problem with the high memory of a 4B issue. At first the board had OKI chips for high memory and one of them was faulty. Since its ea…

    ... for one T-state (the falling edge of the clock at T2 ... to the falling edge of the clock at T3 ...
    Winston Winston December 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…

    ... instruction decoder on the rising edge of the 3.5 ... memory fetches, latches on the falling edge of the system clock ( ... are deasserted just after the falling edge of the 3rd T- ... time between the clock edge and RD+MREQ's ... rising edge is shorter than the ...
    Winston Winston December 2007 Hardware
  • RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…

    ... goes low just after the falling edge of the clock in T4 ...
    kphair kphair July 2011 Emulators
  • Challenge Sprint 4x tape recorderHi, I noticed a [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000051"]Challenge Sprint[/url] on eBay, and checked out the WoS entry for it…

    ... waits until the next positive edge. A polarity correction circuit ... is playing, the next positive edge will happen long before the ... after a positive to negative edge has ocurred

    ... at the precise moment a falling edge
    ;happens, the monostable ...
    mcleod_ideafix mcleod_ideafix August 2011 Hardware
  • ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …

    ... change only at the rising edge of the CPU clock; this ... both on the rising edge and the falling edge of the CPU clock ...
    adorigatti adorigatti September 2011 Hardware
  • Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?

    ... a change in state means edge-sensitive to folks who know ... .
    *** It in fact is falling edge sensitive and the state of ...
    Alcoholics Anonymous Alcoholics Anonymous October 2011 Development
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... actually triggered 22us after the falling edge of the horizontal sync pulse ... shows that shortly after the falling edge of the INT signal, the ... shows a zoom at the falling edge of INT, showing the CAS ... falls about 80ns before the falling of CAS. The upper trace ...
    mcleod_ideafix mcleod_ideafix December 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... shows how 22us after the falling edge of the horizontal retrace ... horizontal counter starts with the falling edge of the sync signal, ... there, 36 clocks to the falling edge of the INT signal. ... these numbers: from the falling edge of the horizontal sync signal ...
    mcleod_ideafix mcleod_ideafix December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... board I made. Following a falling edge at the input, it takes ...
    Zorn Zorn December 2011 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... the new latch at the falling edge of /CAS and retained until ... the next falling edge. This means the column portion ...
    Zorn Zorn March 2012 Hardware
  • Another BUG play tapes, in ALL EMULATORs when press STOP1 FOR n=1 TO 20 : PRINT IN 254 : NEXT n : PRINT AT 0,0 : GOTO 1 RUN Type this simple code, load a TZX, pres PLAY, when ear input change between 191 …

    ... loading routine (it detects the falling edge), all the double pulses must ...
    Z80user Z80user March 2012 Emulators
  • ROM switch on NMIHello! Please, help me or point in the right direction. I am building a project for 48k spectrum which must activate its rom (actually static ram) …

    ... datasheet i see that M1 edge and PC on the address ... , sampling address bus at M1 falling edge seems to be unreliable. I ... to stabilize so that the falling edge of MREQ can be
    ArtemKuchin ArtemKuchin April 2012 Hardware
  • ROM switch on NMIHello! Please, help me or point in the right direction. I am building a project for 48k spectrum which must activate its rom (actually static ram) …

    ... datasheet i see that M1 edge and PC on the address ... , sampling address bus at M1 falling edge seems to be unreliable. I ... words before the actual leading edge of M1. It's really ...
    Winston Winston April 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…

    ... that line (11us after the falling edge of the hsync signal), they ...
    mcleod_ideafix mcleod_ideafix October 2012 Hardware
  • Spectranet updateHi all It's been a busy summer, and in any case I've wanted a little bit of a break from doing Speccy stuff to avoid it getting old (pun intended). …

    ... the CPU gets, since the edge connector signal is actually the ... a 48K has the rising edge slightly delayed with respect to ... the schmitt trigger, but the falling edge is very close to what ...
    Winston Winston 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…

    ... period (7MHz clock) after the falling edge of RAS, the ULA reads ...
    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…

    ... period (7MHz clock) after the falling edge of RAS, the ULA reads ... ". If stored on the rising edge of CLK when IORQ is ...
    Mr X Mr X March 2013 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... only a good and sharp falling edge is needed..

    [QUOTE ...
    Mp Mp September 2013 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... the right place and the falling edge was delayed. Somehow both the ... the position of the rising edge is more important... I'm ...
    jimre jimre June 2014 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ...synchronising to the Z80 /MREQ pin on falling edge.
    HZJ HZJ June 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... the Z80 /MREQ pin on falling edge. This is done as follows ...
    HZJ HZJ June 2015 Hardware
<1234567…34>

Latest Posts

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