DBB board

Here it is resting on top of an iPad (which is on top of a powerbook).

Only thing left to do is to install the +5 volt bus workaround jumper between resistors R37 and R38 and add the 6.3 volt zerner. For some reason the +5 volt jumper wire isn’t mentioned in the SCELBI instructions. I got a bad batch of Zerners, so I’ll have to install that later on. It draws about a 1/2 amp when applying +5 volts to this board without the rest of the system connected.

Except for the omission of the jumper, the standard SCELBI instructions seem accurate for the DBB board.

In case you didn’t remember from my previous post, here is where the +5V jumper goes.

+5 volt wire on DBB board