Thank you Applefritters for all the help! My Apple I repro works!

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Thank you Applefritters for all the help! My Apple I repro works!

I haven't said much but I have searched Applefritter a lot to help with a problem modern Apple I board I picked up off EBay (cheaper than getting all the parts). The problem child was the 2519 chip. It was mostly bad and I built an SMT 2519 replacement board to replace it. I enjoyed learning SMT, despite my eyes being not so great. I experimented with a regular soldering iron and soldered all the parts by hand. I'm hoping to try our hot air setup for the next 2 blanks (long story; 6502 & 6800). I wish someone told me how expensive the chips were before I ordered the 2 blanks (okay I should have checked ...) but I'm now going to build them anyway. I may go the cheap/cheat route until I can find decent chips. This Apple I is sacred, the other 2 sacrelage. :-) 

 

I've posted pictures here:

https://ushomeautomation.com/Projects/Vintage/Apple1/index.html

 

I now need to work on the power supply. Man can that thing generate heat. UncleBernie's power supply mods should help with these and my reproduction Corsham SWTPC builds.

PS: Yes I know the monitor is out of whack. Another thing on my list of todos. ;-)

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Joined: Apr 9 2021 - 04:31
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Happy to hear you got it

Happy to hear you got it working! Nice to see that a variant my 2519 replacement made it work.

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Nice job!

Thanks for using my board layout! I gather you bought it from Armin.

 

Best,

Logan

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SMT 2519 replacement board to replace it

If you are asking me (I think you are), I managed to get the mostly built Apple I Reproduction board because the owner couldn't fix problems with the board. He gave me 5 of the red SMT 2519 boards and some other stuff. So not sure of the source but they are the boards I planned to get anyway for the other 2 bare Apple I repros I have (one 6502, the other 6800). I bought the before I found out how expensive the parts would be (oops). It was cheaper to buy the non-working Apple 1 than buying all the parts. For the other 2 boards I'll cheat a bit with a Fast Terminal and a Pico board for each. Then I'll work on getting all the parts over time.

 

I was surprise at how easy it was to solder the SMT 2519 boards, even the tiny caps. My eyes are shot and I used something like this:

Donegan DA-2 OptiVISOR Headband Magnifier

Not sure of the magnification.

 

Thanks for the work on the SMT board. Works great. :-)

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