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  • Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…

    ... terminal marked NC in the schematic when the button is not ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Hardware
  • Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…

    ... a NMI. Here is a schematic:

    [url]http://www ...
    Phu Phu October 2007 Hardware
  • Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…

    ... multiple NMI's. Now, this schematic is out of a "Z80 ...
    carlinski carlinski October 2007 Hardware
  • Speccy 128 QuestionMainly for the experienced speccy resurecters around these parts. Have you ever had a Speccy 128 with a borked TEA2000 video chip? The reason I ask…

    ... the right place in the schematic. There has to be a ... depends on version of the schematic, I mean the last transistor ...
    ingo ingo October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    ... />
    I could post a schematic to overcome this problem f ...
    ingo ingo October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    [QUOTE=ingo;221446]Yes, that's it but Tom-Cat is also right:



    I could post a schematic to overcome this problem f you like.

    Ingo.[/QUOTE]

    If you can, that would be very helpful. Thanks.
    lextorite lextorite October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    ... />
    I placed a possible schematic on my home page
    ingo ingo October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    [QUOTE=ingo;221486]I placed a possible schematic on my home page
    ( [url]http://www.truppel-online.de/[/url] [/QUOTE]

    I don't think this works because "I" input is in TTL level. With diodes and resistors, the "1" value will be very low.
    Gods Gods October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    ... />

    I corrected the schematic - only 1 resistor is neccessary ... really 5V but in original schematic the level is also the ...
    ingo ingo October 2007 Hardware
  • About the edge connector (reset and comp video)Recently aquired a Kempston type interface for my rubber keyed 48K. Ive been wanting to add a composite video out and it just occured to me i might …

    ... transistors but has a simple schematic I think (no special IC ... be worth to analyze the schematic (unfortunately I actually don't ...
    ingo ingo October 2007 Hardware
  • Zx Spectrum +2 Datacorder - Discman To Car Cassette Tape AdapterHas anyone tried using a discman to cassette adapter on a ZX Spectrum +2 datacorder and loaded games with a CD or direct from a PC Soundcard?

    ... /> I ust looked at the schematic of +2. I think it ...
    ingo ingo October 2007 Hardware
  • About the edge connector (reset and comp video)Recently aquired a Kempston type interface for my rubber keyed 48K. Ive been wanting to add a composite video out and it just occured to me i might …

    ... transistors but has a simple schematic I think (no special IC ...
    Gods Gods October 2007 Hardware
  • 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…

    ... .

    Here's a schematic of a relatively simple add ...
    Winston Winston October 2007 Hardware
  • 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…

    ... ? If so is there a schematic anywhere?

    I would ... bits from one port adress. Schematic is not very complicated - only ... Port 31 (Kempston) a simple schematic is here:

    [url ...
    ingo ingo October 2007 Hardware
  • 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…

    ... off! Looking at the Kempston schematic, which still looks complicated to ...
    carlinski carlinski October 2007 Hardware
  • 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…

    ... '138 part in that kempston schematic posted) or for a full ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Hardware
  • Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…

    Uploaded screens for the following:-

    International Cricket on Tour - 1 Day
    International Cricket on Tour - 3, 4 & 5 Days
    International Cricket on Tour 2 - 3, 4 & 5 Days
    SO4 Tape to Opus Drive Utility
    Blok Load
    Digital Prawn Digital Prawn October 2007 Games
  • Mission to MarsGiven that the Chinese have just launched a probe on a mission to the moon as part of their plans for a manned mission, and Nasa, the Ruskies, and Ja…

    ... director and this was his opus, the effects even now are ...
    Vampyre Vampyre October 2007 Chit chat
  • Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…

    Uploaded screens for "Run OPUS" and "Uni-Dos".

    ... done, as it supports the "OPUS Discovery" disk interface. Also it ...
    Digital Prawn Digital Prawn October 2007 Games
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... looking at an issue 2 schematic, if your spectrum has R57 ...
    Alcoholics Anonymous Alcoholics Anonymous November 2007 Development
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... looking at an issue 2 schematic, if your spectrum has R57 ...
    csmith csmith November 2007 Development
  • What is this?eBay #250187139818.... Anyone have any idea what this is? Has it been emulated? Should it be emulated for posterity? Is it pure evil?

    ... (ROM changes to support different OPUS Discovery versions)
    BloodBaz BloodBaz November 2007 Hardware
  • divIDE woesHi y'all ! Last night I built my lovely divIDE ;-) I downloaded flasher and +divide.tap from [url]http://www.biehold.nl/rudy/+divide/index.htm[/url…

    ... ;-) )
    I've got the schematic here in front of me ...
    csmith csmith November 2007 Hardware
  • Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…

    A prototype was yet made by "Speccy do it yourself" and this is the schematic:
    [url]http://zxspectrum.hal.varese.it/ethernet.jpg[/url]
    the "only" way to do: to write a device driver!!!!!!!!!!!
    flydream flydream November 2007 Hardware
  • How does the Z80 work internaly?How does the Z80 work internaly, i.e. how does it actually execute a machine code instruction? When it fetches a byte from the memory and finds, for…

    [QUOTE=Rickard;229390]
    how does the CPU at a low level know what to do and how does it execute this?[/QUOTE]
    This is done by its internal schematic, completely on hardware level. There's no lower-level microcode in the Z80.
    Sonic Sonic November 2007 Development
  • Floppy Drive on +DHello, I have unfortunately no old drive left, but want run my +D. Problem is that newer drives has no switch anymore for choosing between drive 1 an…

    ... as i remember from the schematic), you may always hook it ...
    Sonic Sonic November 2007 Hardware
  • Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…

    ... would like to see the schematic for it.:wink:
    Pilsener Pilsener December 2007 Hardware
  • Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…

    ... would like to see the schematic for it.:wink:[/QUOTE]
    gtsamour gtsamour December 2007 Hardware
  • +3 soundhello there, just a quick-fire question today. i'm kinda keen on the idea of using my +3 quite a bit, particularly if i bother to to actually sort …

    ... /> A quick look at the schematic and it seems to me ... />
    Does anyone have a schematic for the original Sinclair 128k ...
    FrankT FrankT December 2007 Hardware
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
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    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
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  • Celebrity deaths...
    mel the bell on April 20

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