Creating Wilf Rigter's ZXKBD v3

Discussions about Sinclair ZX80 and ZX81 Hardware
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mahjongg
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Re: Creating Wilf Rigter's ZXKBD v3

Post by mahjongg »

An 7805 can turn itself off when it overheats, this normally happens when its heatsink isn't attached well.
also the K cursor should re-appear when the ZX81 cools off, when its just a 7805 overheating problem.

does the cursor re-appear when you let the x81 cool of for half an hour or so?

Also, was the basement very damp? perhaps the problem is moisture related, or corrosion of the IC sockets.
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mrtinb
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Re: Creating Wilf Rigter's ZXKBD v3

Post by mrtinb »

mahjongg wrote:An 7805 can turn itself off when it overheats, this normally happens when its heatsink isn't attached well.
also the K cursor should re-appear when the ZX81 cools off, when its just a 7805 overheating problem.

does the cursor re-appear when you let the x81 cool of for half an hour or so?

Also, was the basement very damp? perhaps the problem is moisture related, or corrosion of the IC sockets.
This discussion was continued in this thread viewtopic.php?f=7&t=1851
Martin
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
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PokeMon
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Re: Creating Wilf Rigter's ZXKBD v3

Post by PokeMon »

mrtinb wrote: I think I'll try to get a ZX81XT from Pokemon first.
This would be the easiest way to get a distance. The edge connector disappears nearly complete inside the ZX81 (or TS1000).
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mrtinb
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Re: Creating Wilf Rigter's ZXKBD v3

Post by mrtinb »

Wow!

My keyboard pcb works. The pcb is not connected to the keys yet, but when I shortcut the wires, corresponding letters show on the screen. Yes! My first electronics project works!

What is left now is to connect the three pcbs with the keys.
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Martin
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1024MAK
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Re: Creating Wilf Rigter's ZXKBD v3

Post by 1024MAK »

Well done :D

Mark
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Re: Creating Wilf Rigter's ZXKBD v3

Post by sirmorris »

Congratulations!!
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mrtinb
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Re: Creating Wilf Rigter's ZXKBD v3

Post by mrtinb »

It is finished!

https://youtu.be/ZpxC4x36jlg
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Martin
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
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PokeMon
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Re: Creating Wilf Rigter's ZXKBD v3

Post by PokeMon »

Cool ! 8-)
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msch
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Re: Creating Wilf Rigter's ZXKBD v3

Post by msch »

well done - tangled wires ;-)
Mathias

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1024MAK
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Re: Creating Wilf Rigter's ZXKBD v3

Post by 1024MAK »

A key development (sorry :lol: ) :D

Mark
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