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  • 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 …

    only one new ram chip onboard on position ic32, working z80/NEC D780C-1 onboard (only things removed now are the remain ram chips)

    when i press the reset for 5 sec i get the following


    [url]http://aijaa.com/rUySBB[/url]
    xaris_sm xaris_sm March 2013 Hardware
  • Fully-addressed devices initiative (FADI)I would like to introduce an initiative for those who create new pieces of hardware containing legacy devices with well-known addresses. It says that…

    ... has, and identical behaviour for Z80 and ULA as the real ... composite video mod, or a reset button, or whatever. Won't ...
    mcleod_ideafix mcleod_ideafix March 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 …

    ... almost immediately after power up/reset, before accessing any RAM. I ... short circuit) will prevent the Z80 CPU from reading the correct ... oscilloscope that the /RESET signal on the Z80 CPU on pin goes ... back to +5V when the reset button is pressed and released ...
    1024MAK 1024MAK March 2013 Hardware
  • Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …

    ... off doing anything serious in Z80 back in my teenage years ... and rudimentary assembler (and soft reset).

    Sometimes I still ...
    snigfarp snigfarp March 2013 Development
  • Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …

    ... 5K assembly and assemble it, reset the machine, load generated code ... getting old when you know Z80 machine codes by heart (check ...
    RetroTechie RetroTechie March 2013 Development
  • FBZX Wii ReleasedJust tried this out on my Wii and it seems pretty good. 128K AY sound not very good but the emulator is highly configurable. Not bad for a first rele…

    ... rewind on reset
    * Option to ignore joystick configuration of z80 files ...
    * Tape stops on reset
    * Fixed ...
    Oibaf Oibaf March 2013 Emulators
  • 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…

    ... the code the z80 is doing from the reset to the first ...
    Severino Severino April 2013 Hardware
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... ://homepage.ntlworld.com/bad_beard/corsarios.z80]Here[/url] is a snapshot ... is the 48k, and then reset it or leave the whole ...
    Ivanzx Ivanzx April 2013 Infoseek database
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... if the Z80 unsuccessfully is trying to perform a reset.
    If ... only and via resistors to Z80 + ROM + higher RAM ...
    roko roko May 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... if the Z80 unsuccessfully is trying to perform a reset.
    If ... only and via resistors to Z80 + ROM + higher RAM.[/QUOTE]
    deadeye deadeye May 2013 Hardware
  • TZX emulation and implementing pausesHello. I'm developing a small Spectrum emulator in my spare time and I'm currently in the process of hooking up tape emulation to my code. I have a r…

    ... some timing issues in my Z80 core :(
    [/QUOTE]

    reset pulse phase between blocks if ...
    Oibaf Oibaf June 2013 Emulators
  • Trailblazer - mapped?Anyone mapped Trailblazer yet? I'd kind of like to get hold of the maps. D.

    ... .

    * Make Trailblazer-dumps.Z80 from Trailblazer to create Trailblazer ... bytemap
    + $8796-$87B3
    + reset counters, fill Zone A bytemap ...
    Battle Bunny Battle Bunny June 2013 Games
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... output of T2 and the /RESET signal
    - Adding a current ... resistors between matrix array and Z80.
    Maybe there is still ...
    bverstee bverstee June 2013 Hardware
  • Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…

    ... files (loading 128K .z80 creates an instant reset). But 128K games in ...
    Hernán Pablo Álvarez Hernán Pablo Álvarez June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    How about use 1 diode, Anode connect to reset pin of Z80 and cathode connect to microcontroller.
    superfo superfo June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... current flow, EXCEPT when a reset is required, then this pin ... logic 0 at the RESET pin of the Z80). The problem is ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…

    ... ?n;705700](loading 128K .z80 creates an instant reset).[/QUOTE]

    That is because 128k .Z80 snapshots ...
    Dan Antohi Dan Antohi June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... current flow, EXCEPT when a reset is required, then this pin ... logic 0 at the RESET pin of the Z80). The problem is ... increase the length of the reset pulse? Or have you done ...
    1024MAK 1024MAK June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... current flow, EXCEPT when a reset is required, then this pin ... logic 0 at the RESET pin of the Z80). The problem is ...
    superfo superfo June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... resetting the Spectrum must pull RESET to GND, then disconnect ... itself from the reset circuitry to not interfere with ... the rear port implementing a reset circuit like yours, the ... so to stabilize? Z80 needs only 3T to fully reset itself (less ...
    TK90XFan TK90XFan June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... so to stabilize? Z80 needs only 3T to fully reset itself (less ... its working point for the Z80 to start working:

    Z80 can start ROM execution. Until ... has to be held in reset state. Stages 1, 2 and ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Games/Programs making use of DivIDE featuresHello :) I have a question: I may be wrong, but it looks like the DivIDE and similar interfaces for the ZX Spectrum are almost exclusively used for …

    ... , and double-clicking on SNA/Z80 files load the snapshots or ... done with the program you reset the machine, esxDOS boots and ...
    chev chev July 2013 Development
  • DivMMC clock bufferI have completed the first DivMMC EnJOY today: [url]http://www.worldofspectrum.org/forums/showthread.php?t=44238[/url] But there is a problem with t…

    ... that's used for the Z80). I wouldn't usually worry ... also there to buffer the reset signal which is very slow ... happily prevent the Z80 from ever coming out of reset if you ...
    Winston Winston July 2013 Hardware
  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... can take control of the Z80 CPU via a NMI routine ... be able to interrupt the Z80 CPU.
    Now if BASIC ... be accessed). So if the Z80 CPU tries to read from ... ) appears to be via the RESET button, which also resets the ...
    1024MAK 1024MAK August 2013 Hardware
  • New hardware for Spectrum from ShaosI have some ideas for new ZX-peripherals and quickly designed a prototyping board for experiments: [URL=http://nedocon.com/store/speccy/][IMG]http:/…

    ... SNA-file (and may be Z80-file) to 32K image for ... I probably should add a RESET button...
    Shaos Shaos September 2013 Hardware
  • Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …

    ... describe below. It allows z80 asm code to call C ... very inefficient type on the z80 but your idea of ... NUL in string
    ; carry reset no errors
    ; error : (*) ... entrypoint is "utoa_callee" and the z80 entrypoint is "asm_utoa". You can ...
    Alcoholics Anonymous Alcoholics Anonymous September 2013 Development
  • Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …

    ... very inefficient type on the z80 but your idea of using ... "scf" or "or a" (to reset carry). Ie- you are returning ...
    u6c87 u6c87 September 2013 Development
  • .z80 files load faster than .tap or .tzxHello again, I was wondering why the majority of games can be downloaded as .tap or .tzx but not as snapshots (.z80 or .sna). It takes about 5 minut…

    ... loads .tap and .z80 files. Has hotkeys for reset and pause. No ... files, only .z80 files. It has hotkeys for reset and pause but ...
    Zerg Zerg October 2013 Emulators
  • SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…

    ... signal sync.
    [*]Fast reset.
    [*]Four channel sound ... with LOAD "" CODE 16384: RESET.
    [*]Lower 16K ROM ... 5,5.
    [*]Reset ULAplus palette from buffer: RESET.
    [*]Retained ... divIDE and divMMC.
    [*]Z80 LDIR block copy: PUT 49152 ...
    chev chev October 2013 Sinclair Basic
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    Renegade on April 21
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    John Elliott on April 21
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