Wednesday, December 23, 2009

DS0025CN vs DS0026CN

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I tested the DS0026CN chip last week. Although you can enter a program which the system appears to accept, displaying the bytes in memory a...
Sunday, December 13, 2009

Mounting everything to Plywood

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On Dec 12, 2009 I used anything I could find laying around in the basement and garage to mount all of the parts to plywood. I mounted the t...

Clear Screen Button

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On Dec 11, 2009 - I added a momentary switch for Clear Screen, per the schematics. The switch uses +5v which is supplied by the ZIFF on the ...
Wednesday, December 9, 2009

Keyboard connected, up and running!

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On Dec 8 at 1:15AM I finally had reset working and dropping into the monitor program. After building the keyboard circuit, I keyed in the te...
Saturday, December 5, 2009

Apple II Keyboard to Apple 1 mapping/schematics

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All of the preceeding images were sent to me by W.Sander I will be using Sander's design for my keyboard rig. He was kind enough to go ...

Clock Signal on Clone number 2

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This is a shot of the clock signal on the 6502 / PIN-37 The peak is at 4 volts, and the frequency is 1.020 MHz. Horiz sweep is 500.0 ns. I...

First Glimpse of Working Video on Clone number 2

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This image shows the first time I had ever seen video. I don't know why one of the chars is blank, but that only happened the first tim...

Building the 2nd Clone

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I started working on the second clone (the kit version) last night. I finished it tonite, and this one works. I haven't figured out wh...

Soldering resistors

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I actually didn't know I could take video on this camera. This clip shows a few moments of soldering a handful of resistors onto clone ...
Thursday, October 29, 2009

Solder Bridge Found...

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A few days ago, I noticed that the LED for address line A4 on the expansion card was not illuminated. I removed the expansion card and conn...
Saturday, October 24, 2009

Clock Signal Fixed...

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Note the square wave on the scope... I finally have a clock input signal on pin 37 of the 6502 processor. I found that replacing the Philip...
Tuesday, October 20, 2009

2513 Character Generator

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This description of the 2513 Character Generator is from Don Lancaster's TV Typewriter Cookbook. The description explains clearly how t...
Monday, October 12, 2009

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On Sunday, Oct 11, 2009 I decided to put together an expansion card to plug into the Apple 1 motherboard. This card provides the ability to...
Friday, October 9, 2009

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I added the IN914 diode previously mentioned to protect the Apple 1 from unwanted external video surges, and I also added a "power on...
Thursday, October 8, 2009

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On October 6, 2009 I built this external circuit to bring the video, ground and +5v out to a separate PCB with an RCA jack. Eventually I...
Monday, October 5, 2009

Miscellaneous images while populating the PCB

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More power supply images...

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Above: prepping to solder the ON/OFF switch. Above - prepping to solder the female connector to the power supply lines. I don't know w...

Building the Power Supply

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Note that the 4 pin header looks a little rough, because it's actually a cut down version of the 6 pin header. If I took crapier pictur...
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Thursday, September 24, 2009

oops...

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I just realized all four of the A14F are installed backwards... OK, so it took me about 2 hours to fix this major screwup. The A14Fs are ba...

LM323K Voltage Regulator Installation

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UPDATE: Feb.17.2010 - Please note that the A14F recitifier diodes are installed backwards in the above and below images. I fixed this soon ...
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