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  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... "production board" shown here, and test if my -somewhat cheap and ... DMA engine, to assist the CPU in block moving, or sprite ...
    ANDREW RYALS ANDREW RYALS August 2012 Sinclair Miscellaneous
  • Successfully updated Issue 2 48k to 128k?Thanks to the donation by PMSR and through the very patient teachings of Velesoft, I have updated the Issue 2 to work with 128k. However. I have yet …

    Board with circuitry wired to CPU and logic as well as ... 128K (except IK+ 128). Tbios test with DivIDE says everything is ...
    Johan1973 Johan1973 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…

    ... the circuit of test #1 to test whether the CPU CLK signal generated ... will be seen by the CPU (of course, this one is ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... timesaver!) it was time to test it on the real hardware ... Spectrum and sent to the CPU). This output from the ULA ... in phase with what the CPU sees, and also clean up ... too. A more complete test will be to count the ... what's expected. This test is a little while off ...
    Winston Winston September 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... please confirm that we can test higher ram in 16K mode ... address range of the Z80 CPU is available regardless of what ... can PEEK and POKE to test the higher RAM :)

    1024MAK 1024MAK October 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... situation. I created the memory test program that I recently posted ... data. I confirmed that that CPU's clock was still present ...
    Zorn Zorn October 2012 Hardware
  • MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…

    ... /> OK, I decided to test it myself, so I finally ... loaded the Woody's test and surprisingly everything passed. ... so I modified my test and indeed, after these ... more thorough test tomorrow.

    Regarding the CPU, I ... is a genuine Zilog CPU. I'll verify that ...
    Patrik Rak Patrik Rak November 2012 Emulators
  • MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…

    ... specs if this additional internal CPU state is to be preserved ... his hands could write a test to prove this thoroughly. I ...
    Patrik Rak Patrik Rak November 2012 Emulators
  • 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…

    ... register of the ZiLOG Z80 CPU[/URL]
    [URL="http://www ... .z80.info/z80arki.htm"]Z80 CPU architecture[/URL]

    So ... a tool to improve ZEXALL test results in case
    RetroTechie RetroTechie November 2012 Emulators
  • 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…

    I'm also following with interest but don't have any capability to run software on a real machine to test.

    My impression is that the predominant CPU people mention finding in Speccies are NEC ones?
    Fred Fred November 2012 Emulators
  • 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…

    ... to fill in all the test vectors.[/QUOTE]

    The ... test vectors took quite some time ... finally finished. The test now features about 150 test vectors and thoroughly ... core to match the real CPU behavior.

    Patrik
    Patrik Rak Patrik Rak December 2012 Emulators
  • New Z80 CPU emulation testerI have finally wrapped up the new [URL="http://zxds.raxoft.cz/taps/misc/z80test-1.0.zip"]Z80 tester package[/URL] I have previously announced in [URL…

    ... CPU, the results are:

    NEC 780
    - Z80 FULL TEST ... br />
    - Z80 FLAGS TEST:
    - FAILS:
    - ... />
    -Z80 MEMPTR TEST
    - All tests passed.< ... br /> -Z80 CCF TEST:
    - 000 SELF TEST FAILED
    CRC ...
    zx81 zx81 December 2012 Emulators
  • New Z80 CPU emulation testerI have finally wrapped up the new [URL="http://zxds.raxoft.cz/taps/misc/z80test-1.0.zip"]Z80 tester package[/URL] I have previously announced in [URL…

    ... accepted this and adjusted their CPU core accordingly, and life ...
    In case of Zilog CPU, the operations are either copy ... OR. In case of NEC CPU, apparently, the operations are ... br /> -Z80 CCF TEST:
    - 000 SELF TEST FAILED
    CRC ...
    Patrik Rak Patrik Rak December 2012 Emulators
  • Operation Wolf grenadesRecently bought Operation Wolf for playing on 128k with Kempston joystick - Firtsly, it seems weird to have to press 3 for kempston AND fire at the s…

    ... in kempston joystick controll. Not test any keys/buttons for grenage ... grenade.

    Grenade button test is at adress #A514 but ... kempston joystick controll is active, CPU not jump here :-(
    velesoft velesoft December 2012 Games
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... is no longer working. The CPU and ULA are pretty much ... the chips you need to test. You should see +5v, -5v ...
    Winston Winston January 2013 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…

    ... to load some program and test the machine did not worked ... /> You have a faulty Z80 cpu (M1 line), replace it and ...
    gtsamour gtsamour January 2013 Hardware
  • The Official Crap Games Competition 2013 Thread!Just to announce that the 2013 CGC is OPEN! [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/cgctitle2_zps77591934.jpg[/IMG] And for th…

    ... ] just as a static sprite test at the moment but hopefully ... code to free up enough cpu time for them to actually ...
    guesser guesser February 2013 Games
  • The Official Crap Games Competition 2013 Thread!Just to announce that the 2013 CGC is OPEN! [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/cgctitle2_zps77591934.jpg[/IMG] And for th…

    ... ] just as a static sprite test at the moment but hopefully ... code to free up enough cpu time [B]for them to ...
    R-Tape R-Tape February 2013 Games
  • 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 …

    ... it, which (much like a CPU) needs some cycles to initialize ... ' before it does a RAM test.
    RetroTechie RetroTechie 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 …

    ROM to test RAM [URL="http://www.fruitcake. ... we don't want the CPU looking at an un-programmed ...
    1024MAK 1024MAK 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 …

    [QUOTE=1024MAK;687086]ROM to test RAM [URL="http://www.fruitcake. ... we don't want the CPU looking at an un-programmed ...
    xaris_sm xaris_sm March 2013 Hardware
  • Just a curiosity of mixing synth with samplesThis is really a proof of concept, I made for the idea of playing simultaneously two ZX Spectrum computers, where one is playing chiptune music and t…

    ... sample track requires almost all CPU time... if the interrupt routine ... easy. However I didn't test this format is the tempo ... (this one I didn't test).
    I played the trackers ...
    Yerzmyey Yerzmyey March 2013 Sinclair Miscellaneous
  • Spectrum 128k +2 grey and EPROMhi all, i am try to fix my spectrum, right now i am little on dead end... i think a good idea is to test RAM/ROM on the Spectrum so i will try to c…

    ... control lines between the Z80 CPU and the rest of the ... circuit) will prevent the Z80 CPU from reading the correct information ... to the eprom the ram test bin and put it on ... rom base and run the test?
    xaris_sm xaris_sm 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 …

    ... control lines between the Z80 CPU and the rest of ... ) will prevent the Z80 CPU from reading the correct information ... anything. If the Z80 CPU is okay, this can ... If you have a multimeter, test using a low resistance range ... to allow the Z80 CPU and the ULA to ...
    1024MAK 1024MAK March 2013 Hardware
  • Announcing MetroSpec: ZX Spectrum 16/48K Emulator for Windows Phone 7 / 8Hi All, I'm the author of MetroSpec, a ZX Spectrum 16/48K emulator for Windows Phone 7 / 8. MetroSpec V1.3 was actually launched in September 2012, …

    ... Omnia 7 that was my test device, the performance analysis tool ... using around 64.7% of CPU time. That's pretty high ...
    GlennEdwards GlennEdwards March 2013 Emulators
  • 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 …

    ... and Atari ST days as CPU caches would cause problems so ... as a learning exercise to test your skills with assembler... spend ...
    ASM ASM 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 …

    ... *obsessively* optimizing assembler when CPU's hit the 800mhz mark ... 't even bothered to test the power of the ... code directly for a CPU takes complete advantage of ... example... The faster the CPU, the more you can ... she uses to control the CPU!!! type in hex, ...
    ASM ASM March 2013 Development
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... communication channel between the CPU and the memory is ... chips which memory location the CPU wants to access.

    The RAM test program gives a red border ... " line between the Z80 CPU (IC9) and IC10 ( ... address information from the CPU to the RAM chips ...
    1024MAK 1024MAK March 2013 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... "A0" line between the Z80 CPU (IC9) and the ROM socket ... "A0" line between the Z80 CPU (IC9) and IC10 (Amstrad 40058 ... track (trace), so check and test for open circuit and short ...
    xaris_sm xaris_sm March 2013 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... communication channel between the CPU and the memory is ... chips which memory location the CPU wants to access.

    The RAM test program gives a red border ... " line between the Z80 CPU (IC9) and IC10 ( ... address information from the CPU to the RAM chips ...
    xaris_sm xaris_sm March 2013 Hardware
<1…12131415161718…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
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  • Celebrity deaths...
    mel the bell on April 20

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