Jim Brain brain at jbrain.com
Wed Dec 3 22:13:55 CST 2008

The unit has some "future" proofing built into it, since it can upgrade 

When new functionality is developed, the owner simply copies the new 
firmware to a CF (or SD) card and reboots the device.  The device 
bootloader will scan for the new code, and program itself with the new 
code if found.  All versions have the feature.  And, I spent a few extra 
bucks and used a 128kB AVR on the unit.  Since the code is now 51K, I 
have plenty of room for new functionality (D81 images, "mounting" images 
under partition numbers, etc.).

Well, the SD version is soldered up, and I can talk to the CPU.  It 
looks like it recognizes the SD card, so I just need to test the IEC 
routines and tweak a few things.  I did realize I forgot to order 2.2uF 
0805 caps for the unit, so I'll have to think of something for the 20 
board I have on hand.  The size is not so critical, I do not think, as 
it's just a smoothing cap for the LDO 3V3 regulator.  Maybe, I can cheat 
and use 10uFs for the 20 units and get away with it... 


Jim Brain, Brain Innovations                                      (X)
brain at jbrain.com 
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! 
Home: http://www.jbrain.com

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