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<1234567…34>
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... pin 1 = -4.9V
    IC6 pin 8 = 11.9V
    IC6 pin 9 ... .

    The resistance on IC6 - IC13 was 9.9K

    resistance doesn't seem too low ...
    kamilb1998 kamilb1998 February 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... the resistance between 0V (4116 pin 16) and:

    -5V (pin 1 ... - 3 k ohms.
    5V (pin 9 ) - should read 300 - 400 ohms ...
    Zorn Zorn April 2012 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…

    ... are the results of the resistance testing. I dont really know ... know that the grnd to pin 9 shouldnt be open. Are there ...
    CHIP [GRND - PIN 1] [GRND - PIN 8] [GRND - PIN 9]
    1 0 ...
    deadeye deadeye 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…

    ... /SIL-Single-in-line-Turned-pin-sockets-82700[/url]

    resistance between gnd and pin 9 ?
    deadeye deadeye 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…

    ... ). When I originally did the resistance tests I tested those for ... from them (except gnd to pin 9 which showed as open)
    deadeye deadeye May 2013 Hardware
  • Op-amp question for the more knowledgeable tech headI have a dual op-amp IC in a 9 pin SIL package. Pin 1 and 9 are Vcc as marked on the datasheet. The internal schematic as supplied on the datasheet…

    ... [*]Have you compensated for the resistance of your meter leads?
    resistance between the Vcc pins ... the test lead resistance into account, the 1R2 resistance is definitely ... Vcc rail, but pin 9 is the only pin that goes there - ...
    DEATH DEATH August 2013 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…

    ... it correctly? Check its pin-out. Have you confirmed ... a multimeter in its resistance mode doesn't indicate ... />
    The upper left PIN 1 of IC 12 shows ... /> 0 Volt on PIN 14 and 5V on PIN 9

    ... :confused:

    UPDATE PIN 1 should of course be ...
    Brian Brian June 2014 Hardware
  • Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…

    ... connectors (keyboard "KBY3", joystick pin 9,) and the pin of the gate array ... set to one of the resistance settings, but other than testing ... the actual resistance of R11 (which I've ... - if it's blown, the resistance will be infinite and no ...
    The Mighty Dopethrone The Mighty Dopethrone February 2017 Hardware
  • Spectrum Amstrad printer leadHi, just been doing a search on the Spectrum+2A/+3 printer leads. Now as I understand it the Amstrad CPC464 and CPC6128 printer leads are compatible…

    ... from one pin.

    The pin in question is Pin 9 on the ... a problem with these two pin differances.

    As I ...
    swift240 swift240 June 2007 Hardware
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... = KB1;
    PIN 7 = KB2;
    PIN 8 = KB3;
    PIN 9 = KB4;

    /* *************** SALIDAS *********************/
    PIN 15 ...
    Winston Winston October 2010 Hardware
  • SPRINTER 2000 and kempston joystickInfo about connection kempston joystick connector on Sprinter 2000 are corrected. My previous documentation contain bugs. Here is all OK (tested on r…

    ... (joy_left) --> joystick connector pin 3
    pin 7 on pinhead (joy_down ... (joy_up) --> joystick connector pin 1
    pin 9 on pinhead (joy_fire) --> ... ; joystick connector pin 6
    pin10 ...
    velesoft velesoft November 2010 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... get

    +5v on pin 9 of IC6
    +12v on ... pin 8 of IC6
    -5v ... on pin 1 of IC6

    pin 1 is only showing
    Marshall Marshall December 2011 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…

    ... working one that voltage on pin 9 (a7) of the 25 to ... , checked on the schematic and pin 4 of the 74ls157 and ... , going up with the schematic pin 19 on the HAL/PAL ... test and stil 0v on pin 19. Obviously I checked with ...
    Pluto63 Pluto63 April 2013 Hardware
  • Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…

    ... , are the voltages:
    4116 pin 8: [b]10,7V[/b ... tolerances of -5V)
    4116 pin 9: 4,99V (ok)

    georgedb georgedb September 2016 Hardware
  • Questions about GALsI'm working on an old danish floppy interface for the speccy ([url="http://allan.hoiberg.dk/eng/zx/"]CS-Disk[/url]) The original interface contain…

    ... PIN 6 = A11 ; /* */
    PIN 7 = A8 ; /* */
    PIN 8 = A9 ; /* */
    PIN 9 ...
    Rorschak Rorschak October 2016 Hardware
  • ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…

    ... independently because I linked pin 9 to pin 5 on the ComCon ... have looked and realised that pin 7 doesn't deliver ... it is connected to pin 5 making it another possible ... other hand, I think pin 8 is not ground, ... traces on pcb to pin 7 and pin 5 and route + ...
    Renegade Renegade January 2017 Hardware
  • Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…

    ... on the 4114 IC6.
    - pin 1 - should be -5V DC ... at about +0.5V
    - pin 8 - should be +12V DC ... was at about +9V
    - pin 9 - seemed correct at about +5V ...
    nama nama July 2017 Hardware
  • Power Play Joystick InterfacePower Play Joystick Interface for the ZX Spectrum. This is a Kempston compatible interface. Address decoding Any IO address where A5 is low... …

    ... socket is a 9 pin D plug.
    [code]Pin 1 - bit ... - Left
    Pin 4 - bit 0 - Right
    Pin 5 - ----- - ... not used
    Pin 6 - bit 4 ... ----- - +5V supply
    Pin 8 - ----- - 0V/GND
    Pin 9 - ----- - not used
    1024MAK 1024MAK July 2017 Hardware
  • Atari (kempston) joystick adapter to Sinclair pinoutWhile going through one of my boxes filled with hardware bits I found the joystick adapter I used with the +2: [img]https://i.imgur.com/tlBHTco.jp…

    ... . I decided to check the pin correspondence on both plugs and ... pin 5 (atari) wired to pin 1(sinclair) and pin 9 (atari) wired to pin ... DB9 plug make use for pin 1 or 3 ?

    Renegade Renegade October 2017 Hardware
  • Amstrad CPC joystick with 1,2 or 3 fire buttons usable with Spectrum?I was not aware that some cpc joysticks (or with a 'cpc mode selector') allowed up to 3 fire buttons! But it seems the pinout is not the usal one …

    ... the spectrum interface (pin 6 - fire 1; pin 8 - ground; pin 9 - fire 2 ...
    Renegade Renegade April 2019 Hardware
  • zx spectrum +2 no clock signal ??help me ...... looking at a specie +2 (original +2) it is the Z70700 issue 1 (uk one) i seem to have no clock,no display,no sound at all. it is sho…

    ... ,changed TR 8, & TR 9 although i don't suspect ... crystal (LC74HCU04) i notice that pin 2 goes to the cpu ... pin 6 (clock) and that pin 13 of IC12 ... side of the crystal and pin 9 goes to the other side ...
    mark8bit mark8bit July 2020 Hardware
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... , Timppa wrote:
    I measured PIN 6 on TEA2000 (as Fraser ... voltage, but on dead one pin is 0V. This is at ... should have +0V on pin 9, Vcc on pin 11 (I imagine +5V ...
    Spirantho Spirantho July 2005 Sinclair Miscellaneous
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... - Pin 12
    D3 - Pin 8
    D4 - Pin 7
    D5 - Pin 9
    D6 - Pin 10 ...
    D7 - Pin 13 ...
    Marcelo Marcelo January 2007 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... br /> You can find the pin-out of this device by ... /> Pin 1 = Vbb: -5v
    Pin 8 = Vdd: +12v
    Pin 9 = ... Vcc: +5v
    Pin 16 = Vss: 0v
    pin 16, and then check ... 8 and 9. (If you're unsure of IC pin numbering, ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... br /> You can find the pin-out of this device by ... /> Pin 1 = Vbb: -5v
    Pin 8 = Vdd: +12v
    Pin 9 = ... Vcc: +5v
    Pin 16 = Vss: 0v
    pin 16, and then check ... 8 and 9. (If you're unsure of IC pin numbering, ...
    Winston Winston March 2007 Hardware
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... multimeter's common lead on pin 16 (Vss). Then check:

    pin 1 - Vbb: this should be ... : this should be +12v
    pin 9 - Vcc: this should be +5v ...
    Winston Winston March 2007 Hardware
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... multimeter's common lead on pin 16 (Vss). Then ... check:

    pin 1 - Vbb: this should be ... this should be +12v
    pin 9 - Vcc: this should be + ... mem voltages:

    Pin 1: minus 5.13v

    pin 9: 4.98v

    ...
    odious odious March 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…

    ... multimeter's common probe on pin 16 of one of the ... -5v
    Pin 8: Should show +12v
    Pin 9: Should show +5v ...
    Winston Winston May 2007 Hardware
  • TC2068 emulator cart - problemHi, Sorry for posting timex related stuff on a spectrum forum. So, this cart (spectrum emulator) can only adress 16K. I can load small games but i …

    ... slot
    pin 3 - shunted with pin 4

    pin 5 - ... shunted with pin 8 and ... to choose)
    pin 7 - GND

    pin 9 - connects to MREQ ... of the cart slot
    pin 10 ...
    odious odious May 2007 Hardware
  • TC2068 emulator cart - problemHi, Sorry for posting timex related stuff on a spectrum forum. So, this cart (spectrum emulator) can only adress 16K. I can load small games but i …

    ... slot
    pin 3 - shunted with pin 4

    pin 5 - ... shunted with pin 8 and ... to choose)
    pin 7 - GND

    pin 9 - connects to MREQ ... of the cart slot
    pin 10 ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Hardware
<1234567…34>

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