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  • Beepola v1.08 AvailableA new version of Beepoa, v1.08, is now available for download from:- [url]http://freestuff.grok.co.uk/beepola/[/url] (1.76MB zipped exe, no installe…

    ... any z80 machine at any cpu speed.

    I've ... stuff like this just to test things, not to look pretty ...
    Alcoholics Anonymous Alcoholics Anonymous April 2014 Announcements
  • New version emulator ZEsarUX 0.6Hi I have uploaded a new version of my ZX Spectrum/ZX80/ZX81 emulator. Changes are: Added ZX Spectrum smp tape loading (raw audio) Added Image stab…

    ... cpu time on my system (Core2Duo 2,5GHz). As a simple test ... development! If you need to test some concrete things, just let ...
    ellvis ellvis April 2014 Emulators
  • New version emulator ZEsarUX 0.6Hi I have uploaded a new version of my ZX Spectrum/ZX80/ZX81 emulator. Changes are: Added ZX Spectrum smp tape loading (raw audio) Added Image stab…

    ... cpu time on my system (Core2Duo 2,5GHz). As a simple test ... development! If you need to test some concrete things, just let ... />
    Thanks
    Yes, the CPU in Spectrum is not yet ... tell you If you can test some features... As I said ...
    chernandezba chernandezba April 2014 Emulators
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... /> Do you have a different CPU to check? (as there was ... signal and even a new CPU could have a problem with ... to substitute the z80 to test the M1 line but I ...
    Pluto63 Pluto63 April 2014 Hardware
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... . I have also tried the test using some wire to disable ... to white, the ROM and CPU worked for that bit at ... when trying the Upper RAM test the border always appeared white ... with the ROM and the CPU.

    Please Help
    CornishManicMiner CornishManicMiner May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... message appears, as the memory test will have completed at that ... on the other side.
    CPU pin 18 now shows 5 ...
    Brian Brian May 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... />
    Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) pin ... 20 (/IORQ).

    Test between IC1 (ULA ... and IC2 (Z80 CPU) pin 11 (+5V). Do this test twice, swapping ... test.

    Test between IC1 (ULA) pin 12 and IC2 (Z80 CPU ...
    1024MAK 1024MAK May 2014 Hardware
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... IC2 (Z80 CPU) pin 20 (/IORQ).

    Test between IC1 (ULA ... ) pin 33 and IC2 (Z80 CPU) pin ... 11 (+5V). Do this test twice, swapping ... test.

    Test between IC1 (ULA) pin 12 and IC2 (Z80 CPU ...
    1024MAK 1024MAK May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... IC2 (Z80 CPU) pin 20 (/IORQ).

    Test between IC1 (ULA ... ) pin 33 and IC2 (Z80 CPU) pin ... 11 (+5V). Do this test twice, swapping ... test.

    Test between IC1 (ULA) pin 12 and IC2 (Z80 CPU ...
    1024MAK 1024MAK May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... /> Answers:

    Test between IC1 (ULA) pin 33 ... /> Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) ... /> Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) ... pin 11 (+5V). Do this test twice, ... /> Test between IC1 (ULA) pin 12 and IC2 (Z80 CPU) ...
    Brian Brian May 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... /> Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) pin ... /> Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) pin ... 11 (+5V). Do this test twice, ... around after the first test. [COLOR="Red"]--> ... /> Test between IC1 (ULA) pin 12 and IC2 (Z80 CPU) pin ...
    schombi schombi May 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... PCB. If you did test the underside contact, your ... 767251]Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) ... ]Test between IC1 (ULA) pin 33 and IC2 (Z80 CPU) ... pin 11 (+5V). Do this test twice, swapping ... ]Test between IC1 (ULA) pin 12 and IC2 (Z80 CPU) ...
    1024MAK 1024MAK May 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... the board. I repeated this test, but it stays at [COLOR ... ) pin 33 and IC2 (Z80 CPU) pin 11 (+5V) and swapped ... leads around after the first test
    [COLOR="Red"]--> 18 ...
    schombi schombi May 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... the board. I repeated this test, but it stays at [COLOR ... normal keyboard from working. This test was done to confirm that ... ) pin 33 and IC2 (Z80 CPU) pin 11 (+5V) and swapped ... leads around after the first test
    [COLOR=Red]--> 18 ...
    1024MAK 1024MAK May 2014 Hardware
  • DivMMC and K-Mouse Turbo incompatibilityToday I tested a setup someone wants to use, but of which he can't get the K-Mouse Turbo working. The setup contains of: - ZX Spectrum 128K (toastra…

    ... by replacing the Z80 CPU.
    Let's test if that works ...
    bverstee bverstee May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... (IC25 &IC26) convert the CPU address bus from 16 bits ... " your switch) and repeat the test.
    Finally, remove IC23 and ... test once again (on the socket ...
    1024MAK 1024MAK May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... (IC25 &IC26) convert the CPU address bus from 16 bits ... " your switch) and repeat the test.
    Finally, remove IC23 and ... test once again (on the socket ...
    Brian Brian May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... and A15 from the CPU to work out what ... part of memory the CPU is trying to access.< ... copy of the schematic, test on resistance every PCB track ... pin. If this test is okay. Next test on resistance for ... caused by solder splashes, test between each and every pin ...
    1024MAK 1024MAK May 2014 Hardware
  • Issue 4S differencesI decided to buy an Issue 4S PCB after reading much about them on here. It was originally in a plus case which didn't come in the sale. I've been run…

    I have one 4s with replaced CPU to work correctly with divIDE. I am using it now to test Z80s with divIDE on 48k. Probably should do the same with DRAM.
    kpuchatek kpuchatek May 2014 Hardware
  • Issue 4S bad M1Never ever seen a 4S with a bad M1 line before today [url=http://postimg.org/image/o2yrigdb1/][img]http://s14.postimg.org/o2yrigdb1/IMG_1291.jpg[/img…

    ... me, and I replaced the CPU.
    The DivIDE works fine ... rumors say Dixons used a test cartridge or something which killed ... the M1 line from Z80 CPU's from different brands.
    bverstee bverstee May 2014 Hardware
  • Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…

    ... the following:

    - Faulty CPU
    - Faulty ROM
    - Faulty ... fault interfering with communications between CPU/ROM/ULA.

    Faulty ... on electronics and some basic test equipment. Otherwise, I recommend you ...
    Zorn Zorn May 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…

    The power supply is at 13.40v with no load and 10.40v plugged into the spectrum, if that helps?

    Spirantho do you have any tips on how to test the CPU ? It's not socketed so I can't just swap it out.
    darylw357 darylw357 May 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…

    ... CPU is doing is rather hard without the right test ... In order of the test gear that is most useful ... br />
    Putting general test gear to one side, the ... diagnostic tool is a test ROM. Easiest is to ... be programmed with a RAM test program. If the Spectrum ...
    1024MAK 1024MAK May 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…

    [QUOTE=1024MAK;770825]What test equipment do you have?
    ... the CPU is doing is rather hard without the right test equipment ... .
    In order of the test gear that is most useful ...
    darylw357 darylw357 May 2014 Hardware
  • 128+ grey screen faultneed help diagnosing this picture,this is not my machine but a picture found online but this is exactly what i found on this +2grey i just picked up.…

    ... .do you know if ula/cpu etc from a +2a are ... i have i could borrow test chips from other than my ...
    zedexspectrum zedexspectrum June 2014 Hardware
  • 128+ grey screen faultneed help diagnosing this picture,this is not my machine but a picture found online but this is exactly what i found on this +2grey i just picked up.…

    ... .do you know if ula/cpu etc from a +2a are ... i have i could borrow test chips from other than my ... white, this means the Z80 CPU is not working. It may ... [/I]ULA. But the Z80 CPU can be swapped if it ... EPROM chips that have a test routine.

    [I][B ...
    1024MAK 1024MAK June 2014 Hardware
  • Spectrum+ keyboard issueHi I have a spectrum+ (issue 4s board) where the 1-5 keys do not work. I have replaced the membrane and checked for continuity. I have also tested …

    ... address pin on the Z80 CPU?

    Oh, and to ... confirm that the CPU address pin output is working ... to do the simple memory test when keys 1 to 5 ...
    1024MAK 1024MAK June 2014 Hardware
  • Spectrum+ keyboard issueHi I have a spectrum+ (issue 4s board) where the 1-5 keys do not work. I have replaced the membrane and checked for continuity. I have also tested …

    ... you may want to check / test these, but as the rest ... .

    Try a resistance test between Address line A11 and ... .

    Is your Z80 CPU soldered in? If it is ...
    1024MAK 1024MAK June 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... /> To be sure, test between the D7 CPU pin and the DRAM ...
    1024MAK 1024MAK June 2014 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…

    ... out later, that the NEC CPU has some issues and it ... !, so I can't test it after the CPU replacement. I've ... ! + SPECTRA) and it loaded the test program every time without errors ...
    jimre jimre June 2014 Hardware
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