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Search Again :: Adv Search 1000 results in 0.043s
<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 ... then disable the "upper" RAM (as the CAS signal ... RAM chips).

    With the switch "on", power up ... 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 ... then disable the "upper" RAM (as the CAS signal ... RAM chips).

    With the switch "on", power up ... of the "upper" 32k of RAM returns.

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

    Brian Brian May 2014 Hardware
  • Emulation of ZX Spectrum 128+2 (grey)Please read this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=35523[/url] result: exist 3 (or more) versions of grey ZX Spect…

    ... and data bus contain #FF (pull-up)
    - if ula read videoram data and ... continue in reading but data bus contain #FF (pull-up).

    Also ... paging port value 255 (set ram 7,videoram 2, 48rom, disable ...
    velesoft velesoft August 2011 Emulators
  • 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
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... ports A0 A1 A2 . . . .etc D0 D1 ... etc for? are they ... chips.
    Connected the 5 Data lines to 5 pins on ... the MIDI data and connect the appropriate data and address line to simulate ... of resistance, but that is still far from the 10K pull up resistors ...
    eptheca eptheca August 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... with this layout:
    D0 Right
    D1 Left ... or connect kempston data with ZX data bus via resistors ... clone with open collector+pull-up use as output signal ... active /WAIT) - static ram chips not need refresh :-)[/QUOTE ... We can put this line on the C8051F340 (PS ...
    antoniovillena antoniovillena December 2012 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…

    ... />
    The upper RAM, from 32KB to 64KB on ... 2 which has a RAM test, the original fault ... and the short ram test failed with "RAM Error @8000 BTS ... R. The pull up is required to drag the data line to logic ... prove the RAM from 8000 to FFFE, hooking up the ...
    Womble Womble August 2010 Hardware
  • 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…

    ... selection, and mostly ends up in 48K mode. But ... br /> I measured the resistance between 5V and 0V ... screen there was some ram checking done when booting, ... and fired the system up again..
    It worked ... "If an address or data line error is identified then the ...
    bverstee bverstee December 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... old kempston interface, and accept line RD (can be used ... joystick can be unstable, absent pull-up resistor in joystick connector
    - S-KEMPSTON use only data lines D0-D4
    D0 = right
    D1 ... #DF etc....)

    - Data lines D5-D7 are unused ...
    velesoft velesoft August 2011 Hardware
  • Which kempston joystick schematic is the best?I'm looking for the best Kempston Joystick interface schematic. It has to be as cheap as possible. But it must be as compatible as possible. I've c…

    ... bomb, etc...).

    Pull-up resistors is ideal use 4K7 ... 31(#1F)
    ==========================================
    D0- joy RIGHT / XB
    ... schematic, only connect data from your interface to ... 120 Ohm (data bus protector). And M1 line is often ...
    velesoft velesoft February 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... port with this layout:
    D0 Right
    D1 Left
    data with ZX data bus via resistors 100 ... - add possibility switch slow/fast ram pages layout (+2A/ZX128 layout ... logical clone with open collector+pull-up use as output signal / ...
    velesoft velesoft December 2012 Hardware
  • Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…

    ... content from the beginning of RAM up to the DEC A instruction ... every data line. For each one, the Z80 will try to pull it ... same line. If that particular ROM chip has a strong pull up (required ... the ROM chip that pulls up the line (likely another MOSFET). This ...
    mcleod_ideafix mcleod_ideafix February 2013 Sinclair Miscellaneous
  • 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 …

    ... immediately after power up/reset, before accessing any RAM. I would imagine ... also go to one RAM chip and each data line from the ULA ... to higher resistance range (say 20k) and test each data line to the ...
    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…

    ... an error on 0 data line or address line ,what is the ... in bytes of data you need eight RAM chips at ... one RAM chip for each of the eight data lines (D0, D1 ... 128k bytes.
    Made up as follows:
    8 ... "MA0") act as address line 0 for the RAM.

    ...
    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 ... of 128k bytes.
    Made up as follows:
    8 x ... thinks there is an address line problem...

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

    It ...
    xaris_sm xaris_sm March 2013 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…

    ... while the machine is powered up). By the issue 4A ... the ULA that reads the RAM is faulty, the CPU ... Set you meter to the resistance range, I suggest the 20k ... /DRAMWE (pin 4). Next data pins D0 (pin 18) to D7 ... detect.

    Next up, test that the PCB tracks ...
    1024MAK 1024MAK August 2017 Hardware
  • Dual joystick interface schematic?Hi! Would anyone have a schematic for a dual joystick interface? Cursor or sinclair would either work. If not, I might try my hand at designing one.…

    ... that has A0 low. On data bits D0 to D4, it outputs ... low. The data bus pull-up resistors on the PCB pull the data lines high ... / keyboard should only drive data bus lines D0 to D4, and should ... to drive it's output line up logic one / logic high (in ...
    1024MAK 1024MAK May 2018 Hardware
  • PngConvRight. Thought I'd move this to a new thread, simply because I can. If you've not been reading the thread about [URL=http://www.worldofspectrum.org/…

    ... , and use this command-line app to pull them out and #include ... /> So... the second release is up: [URL=http://icabod.org/pngconv_002 ... ), allowing inversion of the image data, and adding an option to ...
    icabod icabod November 2006 Development
  • Speeding up select processing...Hi Folks, I have the following code in my program and it works fine but is rather "sluggish". I have even moved it to the beginning of the program …

    ... basically displays a two line yellow bar on the ... [*]t(3)=the number of data rows displayed on the screen ... and prints a two line bar at line t(1).
    ... />
    [B]Line 310 [/B]- if up/down is pressed and ... then go to line 280.

    [B]Line 320 [/B]- ...
    Paddy Coleman Paddy Coleman June 2011 Sinclair Basic
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    ... ). Change a RAM chip, and the display cleaned up the pixels, ... corruption. For instance, one pixel line from the copyright message on ... will be copied into the line above. Put the other ... />
    Edit: All address lines, data lines and resistors therein are ...
    Spirantho Spirantho August 2012 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
  • 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 ... the machine nuts on power up, and simultaneously produced the magic ... 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
  • DIM DATA and the likeSo...I'm trying to work out arrays in BASIC a bit more and have knocked up the following quick test bed to fiddle about with before trying anything m…

    ... bit more and have knocked up the following quick test bed ... that DATA is used to "fill up" the array.

    Line 190 ... base or I'm cocking up the syntax somewhere...

    70 DATA 1,2,3,4,5 ...
    Wookiee Wookiee January 2014 Sinclair Basic
  • 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 ... faulty. Replaced the ram chips and powered up with ramtest eprom fitted ... and... "lower" ram test ... passed. Then an error on data line 5 showed up on ...
    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…

    ... behaves differently at every boot up. Some rare times I ... Paul Farrow's 128k ram testing program. New Z80 ... got "[b]Bad Data Line 5[/b]" at RAM Bank 0 and ... br /> Also the message "RAM Paging Works Correctly" at ... be on the contended RAM part since its causing ...
    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…

    ... bus delays is to program up to six wait states ... execute = total execution time) take up to six (or more if ... make a request one scan line before, but that could ... dictator that only gives up power when it's ... datasheet and look when the RAM data needs to be read ...
    Sparky Sparky October 2004 Sinclair Miscellaneous
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... a snapshot button) that pull the voltage low on ... interrupt vector table in RAM and arrange for our ... our own interrupt subroutine in RAM running, we need to ... designed with pull-up resistors on its entire data bus so ... put garbage on the data bus when the z80 ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
<1234567…34>

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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
pull 2.9K 3.2K
up 135.3K 178.3K

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