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Search Again :: Adv Search 1000 results in 0.013s
<1…16171819202122…34>
  • Test screens for ZX PrismNot sure that this is *really* the right section for this request, but it's relating to new hardware I'm developing so let's start it off here - a mo…

    ... VRAM is presented to the CPU at 0x4000 (16384) ... VRAM is presented to the CPU at 0x6000.

    CPU writes to the memory ... br />
    Having a selectable "CPU write mask" such as this ... . The data required to test if a pixel is ' ...
    JeffB JeffB July 2014 Hardware
  • New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…

    ... , it looks like the Z80 CPU and ROM are okay, and ... we can't currently fully test it).

    [B][I ...
    1024MAK 1024MAK July 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... rail, I think either the CPU and/or the ROM might ... parts over with for a test? You'd obviously need to ... pin DIL sockets for the CPU and ROM respectively.

    balford balford August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... the golden rule - "Thou shall test voltages". Seems to me that ... it fails, then upper RAM, CPU/ROM can be swapped out ...
    DEATH DEATH August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... the golden rule - "Thou shall test voltages". Seems to me that ... it fails, then upper RAM, CPU/ROM can be swapped out ...
    Spekkie Spekkie August 2014 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... have failed. A supply rail test as Zorn suggests should confirm ... ). Less likely would be a CPU or ROM failure.

    balford balford September 2014 Hardware
  • Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…

    ... /> [*]The ULA clock (and the CPU clock that is derived from ... any other PSU's to test with?

    Some of ...
    1024MAK 1024MAK September 2014 Hardware
  • Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…

    ... /> I'd bet that the CPU clock signal is interfering with ... is displayed, and if the CPU enters contention, the ULA halts ... contention.

    A quick test: if your Spectrum has a ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • 48k Stops loading and resetsI've just fixed the problem I had with my Issue 2 Spectrum only showing 16k memory by replacing all of the upper ram. With that job done I've done a …

    ... 've tried swapping ULA, ROM, CPU and lower RAM to see ... /> I'll try the other test program also, but I have ...
    retrogamemart retrogamemart September 2014 Hardware
  • 48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…

    ... of variations on using a test ROM.
    The easiest is ... /EEPROM.

    The ROM test program (there are at least ... , as long as the Z80 CPU, the address, control and data ... , it should be able to test the RAM and indicate what ...
    1024MAK 1024MAK September 2014 Hardware
  • New PC - OpinionsDearly beloved wants a new PC for her birthday so bearing in mind that I am a tight git and she needs something that will fly on Win 7 and Office, no…

    ... and built it on my test bench.

    Using the ... lot of the time the CPU underclocks itself when it can ...
    ADJB ADJB September 2014 Chit chat
  • New PC - OpinionsDearly beloved wants a new PC for her birthday so bearing in mind that I am a tight git and she needs something that will fly on Win 7 and Office, no…

    ... />
    EDIT: Ran a CPU stress test (Prime 95) which toasted the ... CPU up to 67C and as ...
    Vampyre Vampyre September 2014 Chit chat
  • Weird 1982 Copyright message after cap change.Hello All, As mentioned before I had a busted Issue 6 48K Spectrum+, one of the capacitors had leaked, and trashed the keyboard membrane ribbon. Us…

    ... . The speed of the Z80 CPU is controlled from the clock ... the result of the memory test)?

    [B][I]Mark ...
    1024MAK 1024MAK October 2014 Hardware
  • Weird 1982 Copyright message after cap change.Hello All, As mentioned before I had a busted Issue 6 48K Spectrum+, one of the capacitors had leaked, and trashed the keyboard membrane ribbon. Us…

    ... . The speed of the Z80 CPU is controlled from the clock ... the result of the memory test)?

    [B][I]Mark ... of anything else I can test, I'm wondering if it ...
    Korinel Korinel October 2014 Hardware
  • Weird 1982 Copyright message after cap change.Hello All, As mentioned before I had a busted Issue 6 48K Spectrum+, one of the capacitors had leaked, and trashed the keyboard membrane ribbon. Us…

    ... :
    If I switch the CPU and ULA from another 48k ... a waste given the joystick test :( ) as I couldn't find ...
    Korinel Korinel October 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... is actually a weird Z80 CPU fault or a weird RAM ... the ULA and the Z80 CPU). Also if you renew it ... it is out of circuit, test R24 and R25 on the ... all Spectrum ULA's). Also test the resistance of R27.
    1024MAK 1024MAK October 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... ]Is there a way to test the capacitors in place?[/QUOTE ... is not really possible to test the important electrolytic capacitors in ... clock signal to the Z80 CPU was good or bad.
    1024MAK 1024MAK October 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... excellent choice for a quick test of something, or for ... hardware *around* the ULA - CPU, extra video RAM, extra RAM ... It's on-FPGA CPU is the T80 softcore ... generated at 50Hz (for CPU speeds derived from original ... 28MHz) or 60Hz (for CPU speeds derived from the ...
    JeffB JeffB November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... there is a CPU clock variation all CPU cycles would be affected ... input. This then enables the CPU timing/speed to be checked ... . But both the CPU clock and the 50Hz interrupt ... />
    For a true timing test, a real external clock is ...
    1024MAK 1024MAK November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... indicates either that the CPU is no longer receiving ... added a new interrupt test mode to my diagnostics ... , It'll enter a ULA test mode.

    ... zx-diagnostics/wiki/Firmware#ula-test"]here[/URL] for more ... Winston, the ROM checksum test will always fail as ...
    balford balford November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... indicates either that the CPU is no longer receiving ... added a new interrupt test mode to my diagnostics ... , It'll enter a ULA test mode.

    ... zx-diagnostics/wiki/Firmware#ula-test"]here[/URL] for more ... Winston, the ROM checksum test will always fail as ...
    Korinel Korinel November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... up as a failed memory test.

    I'd examine ... and pin 16 of the CPU - check for any shorts to ...
    balford balford November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... multimeter then, using the diode test mode check that there's ... relevant pins of the ULA/CPU and either side of R26 ...
    balford balford November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... multimeter then, using the diode test mode check that there's ... relevant pins of the ULA/CPU and either side of R26 ... board hole just below the CPU near C4.
    [/LIST]
    CPU and doing the tests with ...
    Korinel Korinel November 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... would likely fail such a test as there'd be noticeable ... and control signals from the CPU to the rest of the ...
    mcleod_ideafix mcleod_ideafix November 2014 Hardware
  • Pixel level collision detection[SIZE=3][FONT=Calibri]I need to do some pixel level collision detection. Assuming I have a byte of my ?player? sprite in DE and a byte of screen to t…

    ... perform the pixel perfect colission test and save some T-states ... with it using box colission test. As I draw the enemy ... byte I have in the CPU.
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... ]very[/I] sensitive to the CPU in the machine being tested ... (Zilog Z84C0006PEC 0438 ) - 1 failed test
    Issue 6A (SGS Z8400AB1 ... /> I found a z80 flags test that I think came from ...
    balford balford November 2014 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... then perhaps have one additional test for IN/OUT added which ... useful if a test which is supposed to test contention requires getting ... too. Or that a documented CPU flags tests don't require ... getting the undocumented CPU flags including MEMPTR and SCF ...
    Patrik Rak Patrik Rak November 2014 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... then perhaps have one additional test for IN/OUT added which ... useful if a test which is supposed to test contention requires getting ... too. Or that a documented CPU flags tests don't require ... getting the undocumented CPU flags including MEMPTR and SCF ...
    Richard_Butler Richard_Butler November 2014 Emulators
  • +2 DIAGNOSTICSIs there a diagnostics test available for the spectrum 128 (+2) in tzx format? I've just obtained a spectrum +2 Grey and all looks fine with it on f…

    ... okay. You could save a test file (program or data) to ... 0 "mode", it restarts the CPU using only the 16k/48k ...
    1024MAK 1024MAK December 2014 Hardware
<1…16171819202122…34>

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