World of Spectrum
  • Categories
  • Discussions
  • FAQ
  • Sign In
Home › Search
Title Search
@title beer Word 'beer' in title
User Search
  • @user admin Only posts by Admin
Text Search
  • @body beer Word 'beer' in the text
Phrase Search
"Hello World" Exact phrase match
Exclude Terms
  • car -red Search cars that are not red
"Or" Searches
  • honda | bmw 'honda' or 'bmw' results
Multi-Field
@(title,body) hello Both contain 'hello'
WildCard
  • hond* civ* Match all with an astrix
Combination
  • @title bmw @user admin
See more supported syntax examples
Search Again :: Adv Search 1000 results in 0.023s
<1234567…34>
  • 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…

    ... the "upper" 32k of RAM. Take a piece of wire ... then disable the "upper" RAM (as the CAS signal won ... 't reach the RAM chips).

    ... of the "upper" 32k of RAM returns.

    Now ... chip is connected to one data line (D0 to D7).

    ...
    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…

    ... the "upper" 32k of RAM. Take a piece of wire ... then disable the "upper" RAM (as the CAS signal won ... 't reach the RAM chips).

    ... of the "upper" 32k of RAM returns.

    Now ... chip is connected to one data line (D0 to D7).

    ...
    Brian Brian May 2014 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... using the resistance range on your meter, measure each data line (D0 to D7 ... on and do the same resistance tests on the address lines ...
    1024MAK 1024MAK December 2015 Hardware
  • Issue 2 black paper white borderGot an issue 2 here that has a 6c001e ULA, no cockroach, no transistor mod (although you can clearly see on the top of the z80 and on some legs, some…

    Turned out to be upper RAM data line 2! All sorted now
    Macc Macc July 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…

    ... another trace onto a specific ram data line... hmm....
    Trafferth Trafferth August 2013 Hardware
  • New game: SETO TAISHO VS YOKAIHello Spec-chums! At last, my new game is available for download: [img]http://www.alessandrogrussu.it/zx/Seto-art.jpg[/img] [b]Features:[/b]…

    ... instruction AND #1F because on data pins D5-D7 can be ... joystick interfaces which use only data line D0-D4. If software read joystick ... joystick port return all 7 data bits.
    EI
    HALT ...
    velesoft velesoft March 2016 Brand new software
  • Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…

    ... br /> I measured the resistance between 5V and 0V ... .. it was not a ram chip: the 'shortcircuit' ... screen there was some ram checking done when booting, ... is an adress-line error: the ram tester shows a ... "If an address or data line error is identified then the ...
    bverstee bverstee December 2011 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…

    ... try to diagnostic a probably RAM fault on my +2 grey ... have some new and old RAM ics KM4164B-12 [B]only ... an error on 0 data line or address line ,what is the difference ... i can identify the faulty RAM ic?
    any tips will ...
    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 …

    ... , before accessing any RAM. I would imagine ... data line from the Z80 CPU should also go to one RAM ... chip and each data line from the ... ULA should go to one RAM chip (the data ... higher resistance range (say 20k) and test each data line ...
    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…

    ... error on 0 data line or address line ,what is ... RAM chip for each of the eight data lines (D0, ... thinks there is an address line problem...

    line 0 for the RAM.

    line "A0" is effectively routed to all RAM chips ...
    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…

    ... is one RAM chip for each of the eight data lines (D0, D1 ... thinks there is an address line problem...

    If the ... ; "MA0") act as address line 0 for the RAM.

    It ... found the faulty line? he said the contended ram ic's
    xaris_sm xaris_sm March 2013 Hardware
  • DivIDE black editions availableI have about 6 more DivIDE black editions ready, and will finish more this week. [B]DivIDE 57c BLACK edition including ESXDOS 0.8.5 and 1GB CF card[…

    ... br /> 8192-16383 = 8kB external ram.

    If PLUS ... I don't know, data lines D0,D1,D6 and D7 change ... (only one bit on D7 line)

    ;---------------------------------------

    ... PLUS use disabled MREQ line then all connected devices ...
    velesoft velesoft August 2013 Sales
  • Hardware description - PLUS D interfaceThis new thread will contain onformations of different ZX devices. Some devices contain manuals, schematics or firmware for some chips, but some peop…

    ...
    8192-16383 = 8kB external ram.

    If PLUS D ... ??? I don't know, data lines D0,D1,D6 and D7 change ... (only one bit on D7 line)

    If anyone know ...
    velesoft velesoft August 2013 Hardware
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... ] So what to check next, Ram chips or address logic chips ... A- and D lines (measuring resistance against ground, meter in 20 ... differing (shortcutted...) one. When a data line is different you may test ... differ between ROM and lower RAM.
    roko roko October 2013 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…

    ... br /> I have seen upper RAM chips fool the ULA into ... this box as the ULA data line is erroneously sent low. ... line, and this line will be in the location of the dead RAM ... chip (i.e. if the line is ... in the far right column, it'll be the D0 RAM ...
    Spirantho Spirantho November 2014 Hardware
  • Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…

    ... devices are connected. Use the resistance range, or the continuity mode ... , using the resistance range, test between each data bus line (D0 to D7) and ...
    1024MAK 1024MAK October 2016 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... the ULA that reads the RAM is faulty, the CPU ... to the 4116 "lower" RAM. So when it detects a ... worthwhile testing the address and data bus. Both to test ... Set you meter to the resistance range, I suggest the 20k ... /DRAMWE (pin 4). Next data pins D0 (pin 18) to D7 ...
    1024MAK 1024MAK August 2017 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... br />
    The upper RAM, from 32KB to 64KB on ... away. Going over the RAM chips with the scope I ... Interface 2 which has a RAM test, the original fault ... and the short ram test failed with "RAM Error @8000 BTS ... is required to drag the data line to logic high, ie ...
    Womble Womble August 2010 Hardware
  • Issue 2 black paper white borderGot an issue 2 here that has a 6c001e ULA, no cockroach, no transistor mod (although you can clearly see on the top of the z80 and on some legs, some…

    ... (indicating data line 3, IC9) now Im using Zorns excellent RAM upgrade for ...
    Macc Macc July 2013 Hardware
  • I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…

    ... failures in both lower/upper RAM. Never mind, good as a ... good lower RAM and a pattern exhibiting a stuck data line during the ... I can perform on lower RAM in the future out of ...
    balford balford November 2013 Hardware
  • Help with 128k greyHello friends, need some help here on try fixing a +2 grey spectrum128. To keep it short, opened the case and the voltage regulator was missing, the …

    ... program.) going down the line the PCF also was not ... I desoldered all the ram chips and after testing ... where faulty. Replaced the ram chips and powered up ... "lower" ram test passed. Then an error on data line 5 showed ... it is not the ram chip. Checked the socket ...
    Pluto63 Pluto63 October 2014 Hardware
  • +2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…

    ... containing Paul Farrow's 128k ram testing program. New Z80 tested ... got "[b]Bad Data Line 5[/b]" at RAM Bank 0 and 2 ... -FFFF.
    Also the message "RAM Paging Works Correctly" at the ... must be on the contended RAM part since its causing visual ...
    gtsamour gtsamour May 2016 Hardware
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... make a request one scan line before, but that could ... eZ80 CPU and share RAM accesses...like those Retro ... and look when the RAM data needs to be read ... /RD) and when the data is valid on bus for ... of databus multiplexer between display RAM, CPU and VGA logic ...
    Sparky Sparky October 2004 Sinclair Miscellaneous
  • "Lost" 48K expansionToday I dug up my Speccy after more than 10yrs of inactivity. I bought it as a 16K in 1983, than I had expanded to 48K and never had problem. Until t…

    ... ) which consists of eight 4116 RAM chips, and upper memory, from ... computer has by testing the RAM, and evidently, on your ... byte of upper RAM) which indicates either upper RAM is not present ... memory - each RAM chip is attached to a single data line back to ...
    Winston Winston April 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... /+5v supply at the 4116 RAM is a convenient place to ... .

    Incidentally, on bad RAM, don't bet on flashing ... 4116 RAM is arranged such that there is one chip per data line ...
    Winston Winston May 2007 Hardware
  • PCB Manufacturer[url]http://cgi.ebay.co.uk/PCB-Printed-Circuit-Board-Fab-Service-for-Hobbyists_W0QQitemZ290143347797QQihZ019QQcategoryZ36323QQssPageNameZWDVWQQrdZ1QQ…

    ... always a chance that a RAM chip may have failed in ... to put +12V on a data line and kill something. The surface ...
    Winston Winston August 2007 Hardware
  • Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …

    ... code, especially if the whole ram contents were saved. I ... games use all the available ram and overwrite the system ... . The MC routine (in the DATA line) was:

    [code] ... means HEADER, A=255 means DATA BLOCK
    55 SCF ...
    Marcelo Marcelo August 2007 Sinclair Basic
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... is what happens when the data is output on the port ... A register appears on the data bus, D0-D7. +5 volts is ... -A7 and D0-D7 is no longer the port/data.
    < ... a 74HC138 3-to-8 line decoder.

    Here' ... IORQ goes high before the data is de-asserted on the ...
    Winston Winston October 2007 Hardware
  • How to contend memoryHow has this been achieved, electronically? Is there a "memory ready"-line for each bank, or something?

    ... there a "memory ready"-line for each bank, or ... address lines, one or more data line, a RD (read, active ... OE for output enable) line to read from the ... chip select, active low) line to select this chip. The ... column strobes) to static RAM (which just takes an ...
    Winston Winston August 2008 Chit chat
  • Another badly behaved RAM upgradeI have a 48K issue 4A board (yellow it is) that was a 48K machine from new, but only reports 16K working with the Sinclair ZX Test ROM in an Int2. H…

    The RAM in a 48k machine is ... likely to be a bad data line. It's unlikely to be ... that was the case, lower RAM would fail too. You could ... multimeter continuity from the appropriate data line off the Z80, to the ... to be a bad address line, since then all the chips ...
    Winston Winston November 2008 Hardware
<1234567…34>

Latest Posts

  • I bought an accoustic guitar. How do you play it?
    dm_boozefreek on 7:51PM
  • Goodbye Z80
    zx1 on 7:11PM
  • 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
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21

HitBox

Word Docs Hits
ram 12.6K 21.4K
data 17.9K 34.5K
line 19.4K 33.7K
d0 322 823
resistance 1.5K 1.8K

Related Threads

  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code:<br /> <br /> [CODE]<br /> ;; ram-check<br /> L11DA: LD H,D ; Transfer the top value to the HL registe…
  • Utility to create long REM Line for storing M/C program - Maximum BASIC Line LengthHi,<br /> <br /> I think there was a Utlity or Toolkit to create a long REM-Line under 48k BASIC<br /> to store some MCode in it. <br /> <br /> …
  • Line - a one line arcade gameHi,<br /> <br /> I have published Line, a game written in a single line of BASIC. Thanks to Einar Saukas for additional optimisations, suggestions,…
  • Are line numbers considered the first statement in the line?I'm trying to understand how BASIC variables are stored in memory using the BASIC Programming manual and am puzzled by the results of the control var…
  • LINE-routine and other nice pieces of codeThe line-topic came in the end with a nice piece of fast coding.<br /> <br /> I think that there might be more of these routines out there (where-eve…
  • line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code.<br /> <br /> The line routine th…
  • How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement.<br /> Know what I found? My old ZX Spectrum.... Those were the days!<…
  • Connecting a data recorder to a +2A?I have a +2A Spectrum, and getting increasingly frustrated by the unreliable built-in data recorder, I decided to start using an external one. <br />…
  • On-line magazineswell we've got all crash scans online thanks to Mort, WoS and others. YS has a great site in YSRNRY. There is Crash online and Sinclair User online t…
  • Anarchy (from Hewson) Level Data?Does anyone here have the ability to get hold of the data for all the levels in this game, as I am interested in remaking it for the pc.<br /> <br />…

Related Searches

  • betadisk rom line
  • scroll line
  • rom to ram
  • modern ram
  • edit line
  • disable uper ram
  • disable upper ram
  • data list from input
  • input data list
  • data list
  • save line
  • opus rom ram size
  • opus rom 8k ram 2k
  • opus rom 8kb ram 2kb
  • ram upgrade
  • ram data line d0 resistance
  • data line resistance
  • ram test basic poke peek program data
  • data array loaded in and saved to the 128k ram disk
  • faulty ram 4164 resistance

Copyright © 2024 World of Spectrum