Apple 1 Replica

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Moonferret's picture
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Joined: Dec 30 2015
Posts: 9

Just finishing off an Apple-1 replica and thought I'd test it by playing a game of Lunar Lander. Chose the version written in BASIC to give the full memory a test....Hmm, something not quite right....And who is this Corgy Cojen chap?? Big smile

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Joined: Aug 10 2017
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Re: Apple 1 Replica

Are you using the correct character generator? What component are you using?

Moonferret's picture
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Joined: Dec 30 2015
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Re: Apple 1 Replica

Turned out to be a flaky shift register. The fault only showed up after it had been on for a while.

speedyG's picture
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Joined: Nov 16 2011
Posts: 2376
Re: Apple 1 Replica

Moonferret wrote:

And who is this Corgy Cojen chap?? Big smile ]

Might be misspelled member from here Corey986 > Corey Cohen...
sincerely
SpeedyG

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Joined: Oct 9 2011
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Re: Apple 1 Replica

Yep that would be me and I would think a shift register was the problem as they are the most likely problematic component to mess with the display in that way.

cbmeeks's picture
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Joined: Jan 17 2005
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Re: Apple 1 Replica

I'm curious, what are you using a shift register for?

I haven't looked over your schematics but I was under the impression that your design was similar somewhat to the Briel version.

I guess I need to study your schematics more. Smile