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Ben Heck's ZX Spectrum 2.0 Part 1 Episode -- Episode 204

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element14's The Ben Heck Show

Join the Ben Heck team every week for amazing hacks! Watch them build and mod community-inspired projects using electronics!

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Ben will recreate an old ZX Spectrum project this week on The Ben Heck Show. Watch as he begins recreating the schematic using CadSoft Eagle in Part 1 of the project.

 

Check out more Ben Heck Show Episodes using Cadsoft Eagle!

Supporting Files

Click Herefor access to all the supporting files you will need to replicate this build!

 

Build Like Ben: Part List for building your ZX Spectrum project:

QtyProduct NameSupplier
Buy These Parts
Buy These Parts
Buy These Parts
Buy These Parts
Buy These Parts
20.1uf Ceramic Capacitorelement14Buy NowBuy Now
1100pf Ceramic Capacitorelement14Buy NowBuy Now
1010k Resistor, 125 mW, ± 5%element14Buy NowBuy Now
110k Resistor, 100 mW, ± 1%element14Buy NowBuy Now
110k Resistor, 125 mW, ± 1%element14Buy NowBuy Now
210nf Ceramic Capacitorelement14Buy NowBuy Now
210uf Ceramic Capacitorelement14Buy NowBuy Now
210uf Electrolytic Capacitorelement14Buy NowBuy Now
112v Step Up Regulator (from 5v)element14Buy NowBuy Now Buy NowBuy Now
1150k Resistorelement14Buy NowBuy Now
2150pf Ceramic Capacitorelement14Buy NowBuy Now
3150R Resistorelement14Buy NowBuy Now
115pf Ceramic Capacitorelement14Buy NowBuy Now
215R Resistorelement14Buy NowBuy Now
116pf Ceramic Capacitorelement14Buy NowBuy Now
1180R Resistorelement14Buy NowBuy Now
121k Resistor, 125 mWelement14Buy NowBuy Now
11k Resistor, 100 mWelement14Buy NowBuy Now
11k5 Resistorelement14Buy NowBuy Now
1220k Resistorelement14Buy NowBuy Now
622nf Ceramic Capacitorelement14Buy NowBuy Now
322uf Electrolytic Capacitorelement14Buy NowBuy Now
32k2 Resistorelement14Buy NowBuy Now
13.5mm Mono Cableelement14Buy NowBuy Now
1330R Resistorelement14Buy NowBuy Now
233pf Ceramic Capacitorelement14Buy NowBuy Now
1390R Resistorelement14Buy NowBuy Now
13k Resistorelement14Buy NowBuy Now
1IQD Crystalelement14Buy NowBuy Now
8470R Resistorelement14Buy NowBuy Now
147nf Ceramic Capacitorelement14Buy NowBuy Now
14k7 Resistorelement14Buy NowBuy Now
15k1 Resistorelement14Buy NowBuy Now
7680R Resistorelement14Buy NowBuy Now
88K2 Resistorelement14Buy NowBuy Now
1Buzzer Speakerelement14Buy NowBuy Now
1Charge Management Controllerelement14Buy NowBuy Now
10Diodeelement14Buy NowBuy Now
1D-Type Flip Flopelement14Buy NowBuy Now
1Heat Sinkelement14Buy NowBuy Now
1Inverterelement14Buy NowBuy Now
1Mini USB Receptacle element14Buy NowBuy Now
1Mono Input Jackelement14Buy NowBuy Now
2Multiplexerelement14Buy NowBuy Now
2NPN Transistor, 100 mAelement14Buy NowBuy Now
5NPN Transistor, 600 mAelement14Buy NowBuy Now
1On/Off Toggle Switchelement14Buy NowBuy Now
1OR Gateelement14Buy NowBuy Now
2RAMelement14Buy NowBuy Now
1Red LEDelement14Buy NowBuy Now
1Reset Tac Switchelement14Buy NowBuy Now
1ROMelement14Buy NowBuy Now
41Tall Push Button Switcheselement14Buy NowBuy Now Buy NowBuy Now
1Z80A CPUelement14Buy NowBuy Now

 

Parts Not Sold by element14

1PAL Compatible LCD Screen 9vAdafruit
1LM1889N TV Modulator
17.4v Lithium Ion Battery
Parents

  • Hi,

     

    I know this is an old topic, but just wondering if anybody has built this, I have had the boards made and built using the Parts list attached, but I am getting an issue on boot see images.

     

    Parts List :- https://docs.google.com/spreadsheets/d/1Vw7Wt83tlDuV_LlnrDvnXtyF9QGz4UiosCHRFFlGcTw/edit?usp=sharing

     

    Has anybody else experienced this.

     

    image

     

    I get the below issue on switch on powerded with 5V, 12V (Video), some of the blocks are flashing, and the Black bars appear when I press the reset button.

     

    I think it is something to do with the CPU reading the Rom but can't find anything wrong. I have reached out to Ben as well, just awaiting response.

     

    image

    Using the KIT 3 from the Github, opened with EAGLE and gerber files sent to China for Manufacture.

     

    https://github.com/thebenheckshow/204-tbhs-zx-kit

     

    I have had my Scope in it and check various signals and all voltages, changed the SRAM and ROM out but still the same issue.

     

    Hope someone out there can point me in the right direction.

     

    Thanks

     

    Mike

  • in reply to knighthawk

    Hi,

     

    I have removed the CPU and get exactly the same screen, but no black bars, so that is what leads me to the CPU possibly not reading the ROM or writing to the new SRAM.

     

    Mike

  • in reply to knighthawk

    I have removed all the SRAM and it does seem to react correctly, so I wonder if it is the SRAM decoding for the ULA, reset button does seem to react as if it is reading the ROM.

     

     

    image

     

    Mike

  • in reply to knighthawk

    I vaguely remember some post-fix bodge wires having to be done. I wonder if we still have any close-up photos...

     

    "The ZX Spectrum ULA" is also a good book to have for reference for this project.

  • in reply to cstanton

    I know there was on the original, I remember Ben putting them in, one being the MREQL due to a naming problem, but not sure about Version 3, as it is much different than the one on the show.

     

    I did buy "The ZX Spectrum ULA" just for this.

     

    Mike

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