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Search Again :: Adv Search 1000 results in 0.012s
<1…11121314151617…34>
  • Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…

    ... RAM control signals and a fault in these or the associated ... watch what happens during the ROM code's RAM test and ... the point it finds a fault. I could give you some ...
    Macc Macc August 2012 Hardware
  • Tape problemsI have finally got round to resurrecting my 16K Spectrum, but cannot get any success in loading software. I am plugging it into the headphone port o…

    One other possibility is a memory fault, so that the available RAM is less than 16k. The ROM startup routine sets P_RAMT to the address of the last good byte, so on a 16k Spectrum PEEK 23732 + 256*PEEK 23733 should give 32767.
    Battle Bunny Battle Bunny September 2012 Sinclair Miscellaneous
  • 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…

    ... 16K Spectrum.

    The fault is most likely with one ... simple check done by the ROM routine doesn't discover the ...
    Zorn Zorn October 2012 Hardware
  • Query about memorySo I know this has been asked a lot and I beg your brief indulgence. I have scanned through a lot of old threads already but I'm trying to improve m…

    At startup the code in ROM carries out a simple test ... there is almost certainly a fault with one or more of ...
    Zorn Zorn October 2012 Hardware
  • Query about memorySo I know this has been asked a lot and I beg your brief indulgence. I have scanned through a lot of old threads already but I'm trying to improve m…

    ... ]At startup the code in ROM carries out a simple test ... there is almost certainly a fault with one or more of ...
    EightBitTony EightBitTony October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... :

    1) The service ROM is the one found at ... 7 white lines, showing a fault of bit 6, but instead ... strip, which translates to a fault in line A0. Just to ... routine reported correctly a D6 fault (blue border and 7 white ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... of all, it was my fault. After pulling ALL the IC ... it back together, the diagnosis ROM greeted me with a properly ... Jan and burn a diagnostic ROM, and from Mark, Roko et ... putting together such great diagnostic ROM.

    Really many, many ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... needed (to fix a "timing fault" for the keyboard reading?).
    The ROM code also shows signs of ...
    1024MAK 1024MAK October 2012 Hardware
  • IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…

    ... you assume it's your fault (which 99% of the time ... service routine, ZX BASIC, various ROM routines etc. or whatever. This ...
    Marko Marko November 2012 Development
  • How to check the whole memory on a +2 greyHi everybody!!! I suspect that i have a bad memory chip on my +2 Grey. Does anybody know if exist any utility to check the whole memory? Thanks a …

    ... 't do much with the ROM other than the checksums, which ... x" (ULA paging error)
    [*]"ROM fail: address 0000, page [0 ... 1]" (ROM checksum error)
    [*]It crashes, indicating a probable fault in ...
    Battle Bunny Battle Bunny January 2013 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... run.
    My divIDE Plus ROM contains the BAZE FATWARE which ... -okay.

    Ran without fault for about an hour in ...
    BloodBaz BloodBaz January 2013 Sinclair Miscellaneous
  • Fuse branchingHi Guys, Although I am a developer, I'm not that experienced with coding under linux and am very out of touch with coding C (not done so for years).…

    ... , I have a bunch of ROM and SZX files (three bmp ... valid.
    [/QUOTE]
    My fault. Fuse has recently updated its ...
    serbalgi serbalgi February 2013 Development
  • Strange behavior of program compiled with HiSoft BASICA while ago I experimented with HiSoft BASIC 128 (1.2) and compiled [URL="http://www.worldofspectrum.org/forums/showpost.php?p=683349&postcount=140"]…

    ... the compiler directly accessing the ROM. I guess this means bye ... 's not due to a fault of my Spectrums.
    Alessandro Grussu Alessandro Grussu March 2013 Development
  • 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…

    ... "page" the existing Spectrum ROM's into memory, so ... ROM failure is rare. Much more common is a bus fault. ... system (like the RAM or ROM chips).

    ... the correct information from the ROM. The Z80 will then ... the contents of the ROM. You can then compare ...
    1024MAK 1024MAK March 2013 Hardware
  • 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…

    ... "page" the existing Spectrum ROM's into memory, so ... ROM failure is rare. Much more common is a bus fault. ... system (like the RAM or ROM chips).

    ... the correct information from the ROM. The Z80 will then ... the contents of the ROM. You can then compare ...
    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 …

    ... br /> i complete remove the ROM chip and nothing change on ... [QUOTE=csmith;688219]The rom in a 48K machine will ... ROM failure is rare. Much more common is a bus fault ... correct information from the ROM. The Z80 will then ... or you have a bus fault.
    Note that ...
    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…

    ... program in the ROM / EPROM / EEPROM (in the ROM socket, IC 8 ... Z80 CPU (IC9) and the ROM socket (IC 8 ). It is ... />
    If it is a fault RAM chip, it is not ...
    xaris_sm xaris_sm March 2013 Hardware
  • Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …

    ... ]

    That suggests a fault in the upper RAM, not ... test carried out by the ROM code and so it gets ...
    Zorn Zorn April 2013 Hardware
  • Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…

    A ULA fault is fairly unlikely, I'd check the CPU and ROM next.
    guesser guesser May 2013 Hardware
  • Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…

    ... pattern suggests a typical fault in the lower RAM ... firmware held in the ROM it should instruct the ... suggests a fault with the CPU or ROM or ULA ... .

    3. ROM: Usually very reliable, but you ... from communicating properly with the ROM and ULA. This can ...
    Zorn Zorn May 2013 Hardware
  • Opus discovery problemTook delivery of another of these today, bad drives but I got one working, a further issue developed after I plugged a Multiface into the Opus's expa…

    ... lost it for me. The ROM that was fitted was a ... , i'll report back the fault when I hear back
    Macc Macc May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... also like to compare your fault symptom picture with those on ... run a test program in ROM that will test the RAM ...
    1024MAK 1024MAK May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... well made transformer or a fault in this part of the ... , I would use a test ROM first, as you can then ...
    1024MAK 1024MAK May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... than buzzing being a RAM fault. :) I don't have the ... -really and run a test 'ROM' that way? I shall have ...
    Trafferth Trafferth May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... pretend to be the Spectrum ROM, (a Divide Plus maybe ... /> [*]Try to fault find without a ROM based test program,
    ROM (it has to include ... build a test ROM (I myself use a ROM cartridge in ... work :-(

    The ROM that I use is the ...
    1024MAK 1024MAK May 2013 Hardware
  • ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…

    ... M1 when paging the shadow ROM.

    Only a vague ... we used when diagnosing the fault.
    JeffB JeffB June 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... , the ROM, the RAM combined that process keyboard inputs. Any fault that ... /> Not a ULA fault :)
    Not a membrane fault :)
    No corruption ... Interface 2 with a game ROM
    [*]to measure the resistance ...
    1024MAK 1024MAK June 2013 Hardware
  • ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…

    ... have moved (although a modified ROM could, perhaps, rearrange the page ... 't work together, does the fault follow the Speccy, or the ... like the Spectrum is at fault, but I think you would ... the ENABLE input of the ROM chip in the spectrum?
    u6c87 u6c87 June 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... from the search for the fault.

    Recommendations, anyone? :S ... : any chance of a test ROM? Happy to pay for materials ...
    Trafferth Trafferth June 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... capacitors.

    A test ROM should help to either clear ... you more information on the fault.

    If you have ... to check for a bus fault, power down, remove the RAM ...
    1024MAK 1024MAK June 2013 Hardware
<1…11121314151617…34>

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