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<1…24252627282930…34>
  • +2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…

    ... Contended Memory (64k bytes of RAM).
    IC17 to IC24 form ... uncontended Memory (64k bytes of RAM).

    Spectrum +2 memory ... disassembly the IC's bases, check the lines under bases, put ... new bases and new ram IC's

    thanks
    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…

    ... ]check and re-check all the connections/lines from all ram ... ? he said the contended ram ic's
    and ... have one or both RAM banks removed and socketed. ... all those chips, then check with a continuity tester ... at a time, and check for solder bridges under them ...
    Falco-F8L Falco-F8L 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…

    ... already have one or both RAM banks removed and socketed. You ... remove all those chips, then check with a continuity tester between ... , one at a time, and check for solder bridges under them ... clean and check them, put new bases and new ram ics on ...
    xaris_sm xaris_sm March 2013 Hardware
  • Dataline check on Spectrum 128k +2 greyhi all according with this [url]http://tcg.speccy.cz/zoom/pics/plus2sch.png[/url] R22 pin goes to A14 wich is pin 43 of ULA and pin 4 of Z80 bu…

    ... clean and check them, put new bases and new ram ics on ... contended ram ics 25-32 ...
    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 …

    ... clean and check them, put new bases and new ram ics on ... contended ram ics 25-32 ...
    xaris_sm xaris_sm March 2013 Hardware
  • Dataline check on Spectrum 128k +2 greyhi all according with this [url]http://tcg.speccy.cz/zoom/pics/plus2sch.png[/url] R22 pin goes to A14 wich is pin 43 of ULA and pin 4 of Z80 bu…

    ... clean and check them, put new bases and new ram ics on ... contended ram ics 25-32 ...
    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 …

    ... it successfully checks the lower RAM?[/QUOTE]

    ... doesn't identify upper RAM as faulty and then ... either if the upper RAM interferes on the data ... .

    A quick check of the results suggests problems ... 7 in the upper RAM and I believe those ...
    Zorn Zorn April 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 …

    RAM can fail in all sorts ... rudimentary RAM chip, and unless you do a test where you check ...
    Winston Winston April 2013 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    Probably you did it, but:
    - use RGB cable for display to have direct ULA signals
    - check all voltages to see if there are any drops
    - double check if you have Z80/ULA, RAM chips working ok
    kpuchatek kpuchatek April 2013 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    ... have direct ULA signals
    - check all voltages to see if ...
    - double check if you have Z80/ULA, RAM chips working ok ...
    xaris_sm xaris_sm April 2013 Hardware
  • SAM Coupe - a video problemHi mates. Lately I managed to acquire a SAM Coupe 512K. There are, however, certain problems that - I thought - You might help me with, in a mome…

    ... />
    > Can be bad ram (too slow dram chips) or ... remember what You said and check it out later.

    Yerzmyey Yerzmyey April 2013 Hardware
  • 2013 projects: new PlusD, DivIDE and MultifaceI have written about this before, but as I want to let these project be influenced by your opinions, I thought to create a separate topic about it. …

    ... was able to use a RAM Turbo between ZX Spectrum and ... may be mistaken; shall I check it again?
    bverstee bverstee April 2013 Hardware
  • 2013 projects: new PlusD, DivIDE and MultifaceI have written about this before, but as I want to let these project be influenced by your opinions, I thought to create a separate topic about it. …

    ... for joystick logic - I will check available schematics. Nothing related to ... /> Why do you need more RAM ? To use ResiDOS.
    kpuchatek kpuchatek April 2013 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    ... the RAM IC's

    also very important is to check ... regulator 78S05 and TR8/TR9 (replace them)

    critical RAM ... IC's 25-32 (contended RAM) if these IC's works ...
    xaris_sm xaris_sm April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... to measure voltage for the RAM chips, will this be correct ... makes the connection).

    Check on the pins of the ...
    1024MAK 1024MAK April 2013 Hardware
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    What says now RAM test program ? It is ok ?
    I guess you are using RGB output for test, so assuming ULA is ok, it has to be something around CPU/Z80. But you may check ROM too.
    kpuchatek kpuchatek April 2013 Hardware
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    ... had a bridge connection on RAM ic's pins
    ... (i used the same RAM tester ROM from Paul farrow ... also you can remove all ram ic's from 17-24 ... and conflict with the good ram ics main ics 25- ... program will work

    check PCF pins also for continuity
    xaris_sm xaris_sm April 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... very hot...
    Two ram chip (IC28 and IC30) ... now want remove the two ram chips... but with my ... replacement for the two dead ram...
    thanks to all ... and then change the hot RAM chips, WITHOUT TRYING TO ... of the holes, then check with a magnifying glass ( ...
    Falco-F8L Falco-F8L April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    did you check this page here?

    [ ... " ?
    how did you check the RAM ic's ULA, CPU and ...
    xaris_sm xaris_sm April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    [QUOTE=xaris_sm;696669]did you check this page here?[/QUOTE]
    ... the reply. Yes I did check the page, but the ... ?
    how did you check the RAM ic's ULA, CPU and ... etc. as with a lower RAM failure.

    I ... tested the RAM IC's, ULA, CPU and ...
    Pierre Pierre April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... be present at the 4116 RAM chips for example.

    RAM chips.

    When you ... 's 3 clock signals to check: 14 MHz ULA xtal, 3 ... that. And perhaps measure connections / check IC socket board contacts etc.
    RetroTechie RetroTechie April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... /> - Quit upper ram
    - Power on.
    - Check that it has ... Check +12v in LM1889. Check +5v, +12v, -5v in lower ram.< ... br /> - Check TR6, TR3.
    - Check romcs signal.
    - Check address bus ... tester.

    - Check address bus from 4116 chips ...
    Jose_Leandro Jose_Leandro April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... may not with the lower RAM removed)?

    I can ... the remaining problem.

    Check diodes D15 and D17 with ...
    Zorn Zorn April 2013 Hardware
  • 48k fuzzy screen errorHi all, I just got a ZX Spectrum 48k (rubber keys) from eBay and when I plug it in the main screen on the TV is all fuzzy and garbled in the middle.…

    ... the problem. You might also check for the presence of all ... necessary voltages at the lower RAM ICs (as I mention towards ... risk killing any of the RAM ICs that may still be ...
    Zorn Zorn April 2013 Hardware
  • Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…

    [QUOTE=tstih;698411]You can check mine at [URL="http://github. ... +3DOS into the Multiface 3 RAM, then modify it to make ... would need 16 bytes of RAM somewhere, which isn't a ... 've already got a quick check to see if any process ...
    u6c87 u6c87 May 2013 Development
  • 128k Basic used much ?Hi - I was wondering if there were many,if any, games programmed in 128k basic? I was also thinking of doing one myself as I wish to make a text heav…

    ... proper way of accessing the ram disk.

    (god i ... OS difference that you could check for, via say peeking the ... ..

    c64 , you can check for pal or NTSC or ...
    fog fog May 2013 Sinclair Basic
  • Poke on +2 greyhi, should i poke 65535,0 or 65536,0 in the first case i get OK 0 but in the second one i get "B interger out of range,0:1" i am trying to load z…

    ... /> If you want to check the RAM on the +2 then there ... ?t=42110&highlight=check+memory]How to check the whole memory ...
    Battle Bunny Battle Bunny May 2013 Hardware
  • Poke on +2 greyhi, should i poke 65535,0 or 65536,0 in the first case i get OK 0 but in the second one i get "B interger out of range,0:1" i am trying to load z…

    ... repair and i tested the ram with ram rom tester bin file ... />
    is any way to check the whole 48k mode?
    xaris_sm xaris_sm May 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    First of all: Check if your multimeter/voltmeter is ... as ULA, CPU, ROM and RAM.

    Maybe it is ...
    ingo ingo 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…

    ... 's begin with the basics: check +5 and +12V on centre ... pins of the LM317s, and check all the edge connector pins ... chips (EPROM, RAM, PIA, FDC) between the two to check them for ... . You can also repeat the check on the edge connector of ...
    Falco-F8L Falco-F8L May 2013 Hardware
<1…24252627282930…34>

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