Computers + Peripherals

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Apple /// Reset Logic & Apple II Emulation Flaws

I recently ported software from the Apple II to Apple III and encountered an interesting topic. It's a corner case, but in my opinion a typical example. It shows how the Apple III design was sometimes (maybe unnecessarily) complicated. And how features introduced Apple II compatibility issues.

A few tests for a non-booting Disk II controller

A collection of simple (simplistic) tests for diagnosing a non-booting Disk II or A2 disk controller:
  • Monitor commands to test 6 of the 8 data latches in the 9334 chip
  • Monitor commands to load just one sector, then beep and break
  • Attach an LED to troubleshoot individual latches Q0 through Q3
  • Use a flashlight to "candle" circuit traces
  • Use wood or bamboo to scrape debris off the circuit board

Apple's new products from "Peek Performance" - My thoughts

Honestly, I haven't tuned in until the Mac Studio got announced. However, I would like to share my thoughts on the new products.

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Apple Intelligent Keyboard Prototype

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Ventless Rev 0 Apple II

Woz designed the Apple II, but Steve Jobs clearly had a hand in designing the case. His obsession with design and hatred of fans dates back to the very beginning. No computer in the Apple II line had a fan. The very first didn't even have vents.

Due to issues with overheating, this design was soon modifed to have vents. Early buyers had the option of upgrading to the vented case, and many did. Others, such as the owner of the computer pictured below, added fans.

These are some of the best photos I've ever seen of a ventless, Revision 0 Apple II. Thank you to hamandhifi for giving me permission to share them. This computer sold on 5/30/19 for $11,236.90. 

There is a discussion of the computer here: Apple II rev.0 serial A2S1-0203 up for auction

 

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Achim Breidenbach's High Res Apple I Pictures

Desktop Pictures

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