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  • Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…

    ... .

    As to the fault. Without some further work and ... running the code from the ROM. There is nothing new to ...
    1024MAK 1024MAK November 2017 Hardware
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    ... machines, to see if the fault stays the same, or if ... try the same with the ROM (EPROM) chips.

    [b ...
    1024MAK 1024MAK November 2017 Hardware
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    ... machines, to see if the fault stays the same, or if ... try the same with the ROM (EPROM) chips.[/quote]
    I ...
    The Mighty Dopethrone The Mighty Dopethrone December 2017 Hardware
  • Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …

    ... if there was a fault with CPU, SCLD, ROM then would 16K ...
    Renegade Renegade December 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... between the Z80 and the ROM and/or ULA. Swapping the ... the ROM. Either there is an address/control/data bus fault (short ... circuit or broken connection), or either the CPU or ROM ...
    1024MAK 1024MAK December 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... ROM. Either there is an address/control/data bus fault ... (short circuit or broken connection), or either the CPU or ROM ... continuity checking between the ROM and Z80 and ... original and a GoshWonderful ROM images installed, maybe ... a C64 with a fault I can't ...
    dozey_dustman dozey_dustman December 2017 Hardware
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... needs to be checked for fault too:

    [ ...

    ; Enable 48k ROM

    di
    ... : disk motor off, 48k rom selected, normal paging
    ... out (c),a ; 48k rom selected, bank 00 at top ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Development
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... the pins on the Dual Rom board have pushed out the ... ) Should I put the Dual Rom Socket back? Answer :- Well ... three chips so the Dual ROM board gets in the way ... PCB with just one new ROM in it to minimize risk ... that the fault may not be with the Dual ROM PCB - ...
    harriusherbartio harriusherbartio April 2018 Hardware
  • help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …

    ... quickest and easiest way of fault finding suspect RAM problems, is ... a test diagnostic program from ROM.

    Do you have ... that can take a ROM chip or a ROM image file?

    Is the ROM chip on your Spectrum in ...
    1024MAK 1024MAK July 2018 Hardware
  • help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …

    ... quickest and easiest way of fault finding suspect RAM problems, is ... a test diagnostic program from ROM.

    Do you have ... file?

    Is the ROM chip on your Spectrum in ... interface 2!
    No other rom stuff unfortunately.
    I think ...
    redfiat redfiat July 2018 Hardware
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    ... the test will report a fault, and other times it passes ... IC's in and the fault continues.

    I can ... to mind is could the rom be faulty? Still also thinking ...
    Your Spec-chum Your Spec-chum July 2018 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... has a built-in diagnostics rom that can still be booted ... diagnostic rom will identify which IC is faulty making fault finding a ... that would indicate a typical fault with 1 or more lower ... would need a bit more fault finding, my first guess though ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... machine is working. So the fault could simply be a defective ... could still be a RAM fault.

    If you don ... ROM are okay, but that there is a lower RAM fault.
    fault was a faulty keyboard membrane ...
    1024MAK 1024MAK August 2019 Hardware
  • The Diagnostic PCBIt arrived in the post today so this is my first go with the Diagnostic PCB. (bought on Ebay) This item , I think , does the same job as Retroleu…

    ... " machine auto-detection meaning that ROM paging doesn't work correctly ... with a faulty machine. When fault finding, you want as close ...
    1024MAK 1024MAK March 2020 Hardware
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…

    Either the Z80 has crashed due to memory problems (ROM or RAM) or address bus problems, or the Z80 is faulty.

    If it won’t run a diagnostic ‘ROM’, then it’s less likely to be a RAM fault.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK July 2020 Hardware
  • Speccy 4A board problemHi all. I was hoping for some help with my Speccy (with 4A Board) before I send it off for repair. When I power it on all looks fine (i.e. copyright …

    ... It could be a RAM fault, most likely the ‘lower’ ... and easiest method of fault finding, is to use ... tester that runs from ROM. Either ROM on an interface ... place of the BASIC ROM (assuming that this is ...

    If the fault is then still present, you ...
    1024MAK 1024MAK September 2020 Hardware
  • How to apart a 16K from a 48K?How can I understand that if i have a 16K or 48K? Thanks

    ... />
    The ZX Spectrum BASIC ROM sets a system variable that ... that if there is a fault with the ‘upper’ / extension DRAM ...
    1024MAK 1024MAK April 2021 Sinclair Miscellaneous
  • how can we load +3dos files in assembly?is there some way to load +3dos files in assembly, like calling bios routines somewhere? (like defining in registers the filename string address in m…

    ... fault), try this one:
    [code]di
    ld a,$07 ; ROM ... , but a must be $10 (ROM 1 / RAM 0).

    Zup Zup August 2021 Development
  • I just bought a second hand BBC MasterI have had the notion for a while to get myself a old Beeb - maybe a scrappy one and fix it up - recap its PSU or whatever. Well I gave in yesterday …

    ... when there is a hardware fault). For example, the Memotech MTX ... takes the operating system in ROM to do some checks/tests ... be inhibited if a sideways ROM takes control. So some systems ...
    1024MAK 1024MAK September 2022 Chit chat
  • I just bought a second hand BBC MasterI have had the notion for a while to get myself a old Beeb - maybe a scrappy one and fix it up - recap its PSU or whatever. Well I gave in yesterday …

    ... when there is a hardware fault). For example, the Memotech MTX ... takes the operating system in ROM to do some checks/tests ... be inhibited if a sideways ROM takes control. So some systems ...
    dmsmith dmsmith September 2022 Chit chat
  • DISCOVERY ...Hi, I have just bought a DISCOVERY drive for Spectrum, but i have not the documentation with it... Do you think that i can find it on this "marvelous…

    ... know how to transfer some "ROM" from this site to Discovery ...
    P.MERCIER P.MERCIER February 2002 Emulators
  • Roms for Yase2?I was wondering if anyone knows where to get the rom-files that is needed for running Yase2. They weren't included in the zip-file, and I can't find …

    ... knows where to get the rom-files that is needed for ...
    neffuM neffuM September 2001 Emulators
  • Sound emulation...I recently souped an 486 I had with some memory, a Soundblaster 16 and CD-ROM drive. It would have been a monster just a few years ago [img]/__forums…

    ... , a Soundblaster 16 and CD-ROM drive. It would have been ...
    Fuzzbucket Fuzzbucket September 2001 Emulators
  • Currah MicroSourceThis is an interesting one for the experts to mull over. I've got (and love) a MicroSource interface from Currah which consisted of an 8K ROM provid…

    ... which consisted of an 8K ROM providing assembly (excellent), forth (v ... to page in the ROM and "grab" the ROM contents but it ... PC register passes a particular ROM address when you type
    ROM and if so, have they ...
    Chris Chris August 2001 Emulators
  • UNI-DOSDoes anyone know where I can get a ROM image file of the UNI-DOS operating system . Is it freely available , or is it under copyright still ? I would…

    Does anyone know where I can get a ROM image file of the UNI-DOS operating system . Is it freely available , or is it under copyright still ?
    I would like to use it in Real Spectrum .
    Dean Lowery Dean Lowery February 2001 Emulators
  • Shadow of the UnicornI've written a program to run Shadow of the Unicorn on a +2A/+3. Is there anywhere it can be put to be available to anyone wanting to play the game?…

    ... work its best with any rom. At the least I can ...
    Anonymous Anonymous December 2001 Games
  • 48K protectionWhich games were 'protected' by loading a full 48K block of code so that no copy program could fit in to memory? I know of 2 by heard. Pole Positio…

    ... reloaded the screen over the ROM and the rest on
    Dr BEEP Dr BEEP August 2001 Games
  • Connect a Discman o soundcard into a ZX to play games without TapesDavid Madrid / Spain Hi: I like to use more my ZX machines but the load times drives my crazy and I dont like to damage the zx cassete player and t…

    ... a PC soundcard and play Rom files from PC with some ...
    David David January 2002 Sinclair Miscellaneous
  • Pentagon128I need the shematics of subj and ROM image. Does somebody have ?

    I need the shematics of subj and ROM image. Does somebody have ?
    Konstantin Konstantin November 2001 Sinclair Miscellaneous
<1…15161718192021…34>

Latest Posts

  • Minor British Sports that did become games on the ZX Spectrum
    dmsmith on 11:22PM
  • I bought an accoustic guitar. How do you play it?
    Maroc's Other Projection on 9:55PM
  • Goodbye Z80
    moggy on 9:07PM
  • Happy 40th Birthday to the Amstrad CPC464!
    AndyC on 6:29PM
  • Another Birthday! The Game Boy Is 35!
    dm_boozefreek on 6:17PM
  • I am currently watching.....
    Antiriad2097 on 5:05PM
  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21

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  • Is it possible to run a single BASIC line via a ROM CALL of the Standard ZX 48k ROM?On: https://cygnus.speccy.cz/popis_trdos-assembler.php<br /> <br /> I found the following code:<br /> [code]<br /> CHADD equ 23645 ; Location of…
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