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  • 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…

    ... ]
    Maybe spectranet uses the Z80 CPU clock of spectrum then ... strikes the limits of the Z80 system. Therefore in my eyes ... to control the chip's RESET pin in software and be ...
    Winston Winston August 2012 Sinclair Miscellaneous
  • Just bought a Spectrum+. Doesn't work. Red bars on screen.Hi all, Something of a noob here. Having recently been on holiday, I came across a Spectrum+ in a box, with a collection of games in a shop, and, af…

    ... Spectrum powered on, release the reset button. Does the border ... white? If so, then the Z80 and the ROM are most ... capacitor responsbible of generating the reset pulse (C27) is damaged, ... permanently shorting RESET to ground, or being unable ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • z80 Code Profiling (RESOLVED)Hi All, Just a quick question to ask if there is any way of profiling z80 Code for the Speccy??? I'm trying to write a piece of software and I curr…

    ... -- for 'normal' emu or real z80 it's just a 8 ... things:

    trapcode == 0: reset 'tick counter'
    trapcode == 1 ...
    Ketmar Ketmar August 2012 Development
  • 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…

    ... have your board control the reset circuit on the Spectrum - of ... won't come out of reset until your FPGA is ready ... Z output is because the Z80 has already a pullup resistor ...
    mcleod_ideafix mcleod_ideafix August 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…

    ... , is much longer than the reset pulse generated by the RC ... the Z80 without a clock signal during and after the reset cycle ... to have the FPGA to reset the Z80 once it's operational ... from the FPGA to the reset line at the Z80.
    mcleod_ideafix mcleod_ideafix August 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…

    ... much longer than the reset pulse generated by the ... Z80 without a clock signal during and after the reset ... have the FPGA to reset the Z80 once it's ... FPGA to the reset line at the Z80.[/QUOTE]
    ... DONE" signal from FPGA to reset Z80. "DONE" go HI when ...
    superfo superfo August 2012 Hardware
  • How the heck do you save?I just loaded up a very old favourite, [i]The Bard's Tale[/i], and have discovered that it is such a perfect copy of the original that you have to us…

    ... works with 48k), or a Z80 memory dump. Some of them ... much in the file, then reset the emulator, destroying the team ...
    Atreyu Atreyu October 2012 Games
  • How the heck do you save?I just loaded up a very old favourite, [i]The Bard's Tale[/i], and have discovered that it is such a perfect copy of the original that you have to us…

    ... to run the snapshot and reset to the emulator to the ... 128 game instead of a .z80, it's buggered the file ... . I know you can use z80 for either, but like I ...
    dm_boozefreek dm_boozefreek October 2012 Games
  • Half dead divIDE helpHi. My divIDE boots up fine but nothing comes up when I press its NMI button. The button was tested and is ok. Any advice?

    ... not tarnished
    b) The Z80 chip on the Spectrum may ... you need to replace the Z80 (unfortunately that chip is normally ... it failed. I replaced the Z80 with some others known to ... nothing happens.

    I reset the divIDE, then it displays ...
    pkersey pkersey October 2012 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…

    ... pull-up resisistor on the reset line.
    Something to do ... with boosting the reset signal/level I believe.
    4. Replace Z80
    5. If the DivIDE ...
    bverstee bverstee November 2012 Hardware
  • Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …

    ... the Bresenham algorithm working in Z80 assembler for x,y axes ... able to find any in Z80 assembler; for example:
    [code ... addition routine
    bcf _overflow ;reset overflow flag
    movf a3 ...
    Battle Bunny Battle Bunny November 2012 Development
  • 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…

    ... , as it means that no Z80 emulation out there is actually ... make me believe that the Z80 CPU has an internal register ... the flags, this register is reset instead (or in case of ...
    Patrik Rak Patrik Rak November 2012 Emulators
  • Spectrum Playbasic EMULATORHi, Im new to the site and im writting a spectrum emulator in Playbasic :-o Its halfway complete. But i need help with emulating sound!? Anyone care…

    ... a good deal of the z80 core. Marko also wrote some ... that.

    Writing the z80 core is at once a ... , aim for just a proper reset sequence.

    Keep coming ...
    Dunny Dunny December 2012 Emulators
  • Code execution logging/profilingAs revealed in [url="http://www.worldofspectrum.org/forums/showthread.php?t=41666"]this thread[/url], I'm adding support for reading code execution l…

    ... /> Z80 map file: JP $8000 -> 100 (one set bit, two reset ...
    SkoolKid SkoolKid December 2012 Emulators
  • Spectrum Playbasic EMULATORHi, Im new to the site and im writting a spectrum emulator in Playbasic :-o Its halfway complete. But i need help with emulating sound!? Anyone care…

    [QUOTE]Writing the z80 core is at once a ... reset sequence. ][/QUOTE]

    Hi Dunny, Ive written a little Z80 ...
    baggey baggey December 2012 Emulators
  • Psion 5 Spectrum Emulator probsI picked up a second hand Psion 5MX as I have gotten the text adventuring bug once more. I installed the Sinclair Spectrum Emulator version 4.0 by Pa…

    ... . Anyway I did a hard reset of the Psion and installed ... . For example when loading a z80 of ghouls and ghosts in ... I get the error message 'Z80 page out of range. Try ... load Game Over z80 I get a message 'Z80 v300. SAM RAM ...
    yadster yadster December 2012 Emulators
  • Psion 5 Spectrum Emulator probsI picked up a second hand Psion 5MX as I have gotten the text adventuring bug once more. I installed the Sinclair Spectrum Emulator version 4.0 by Pa…

    ... . Anyway I did a hard reset of the Psion and installed ... . For example when loading a z80 of ghouls and ghosts in ... I get the error message 'Z80 page out of range. Try ... load Game Over z80 I get a message 'Z80 v300. SAM RAM ...
    snigfarp snigfarp December 2012 Emulators
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... ROM in other than a reset or an NMI... Is this ... to be visible by the Z80 as its sole memory address ... space), retrieves whatever values the Z80 registers had when the snapshot ...
    mcleod_ideafix mcleod_ideafix January 2013 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... ).
    Rebooting using the SPECTRA reset switch worked fine; booted solidly ... in snapshots. Performed a few reset/load cycles. The NMI button ... FATWARE). Again loaded tap and z80 files directly.

    All ...
    BloodBaz BloodBaz January 2013 Sinclair Miscellaneous
  • 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). …

    ... also very particular about the reset signal, and I know ... through the buffer the reset signal has a very ... the Z80 starts running before the CPLD sees reset being ... no longer held in reset by the time the ... boot it's because reset has remained asserted on ...
    Winston Winston February 2013 Hardware
  • Difference between brands of 4164 chips?I have gotten my hands on a batch of several brands of 4164 chips. Examples are NEC D4164C-3 and Mitsubishi M5K4164ANP-15. Anyone knows if any type …

    ... machine's reset signal. Since /RAS cycles result from Z80 memory requests ... condition is met after the Z80 runs through a few ROM ...
    RetroTechie RetroTechie 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…

    ... of it, the Z80 must be out of reset - the stripes you ...
    Winston Winston 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…

    ... of it, the Z80 must be out of reset - the stripes you ... or CPLD do not use RESET, but do control ROMCS.
    bverstee bverstee 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…

    ... ROM0 will be executed upon reset, and the instruction in ROM1 ... RAM be paged out upon reset, then I appear to get ... all passed straight from the Z80 to the expansion bus.
    zub zub 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…

    ... is:
    [LIST]
    [*]Reset by a reset of the machine.
    reset and their values therefore ... /> [LIST]
    [*]Set by a reset of the machine — although perhaps ... should be reset instead?
    [*]Set by code in the Z80 emulation ...
    zub zub February 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 …

    ... /> Now press and hold the reset switch (for at least five ... ? and which of the two z80 that i have?
    i ... show with all chips on (z80 native is on board i ... ram chips on the working z80 from 48k/NEC D780C-1 ...
    xaris_sm xaris_sm March 2013 Hardware
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