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Sorry to drop out of this but life intervened. Anyway, I'm eager to get this 500 board working somehow. As it stands, I have two choices: 1) Try and get a serial ROM and run it as a board or in some kind of superkit configuration 2) Get a 480 backplane and keyboard and use the 440 board and run it a...

I would totally pay for the efforts and costs of anyone willing to create the appropriate 1702 rom(s) for me. I throw in plural because I have no way of knowing really if the other roms are alive. Might make sense to burn a set of the correct ones for serial use.

Darn! I wondered if it might be that kind of situation. Yeah I wouldn't have a clue how to make one of those PROMs. Is that PROM specific to the 540 or could the 440 I have be used? Then all I'd have to do is find a backplane.

Yeah until I have a scope obviously not much I can do here. I always just try a power up test anyway on 'new' equipment. I did have a few things hooked up wrong on the first attempts. But yeah.. think this is as far as we get for now. I wonder.. could I strip the RAM down to a base level just for te...

I tried wiring things up as per that great diagram but still no joy. At 300 baud there is no reaction on my terminal screen when I fire it up or reset.

Reading the manual a bit more carefully in the baud selection section. If I'm understanding right, you jumper from one of the four holes on the left to the single hole on the right using a capacitor with a certain rating. I'm assuming the four holes on the left provide the ability to handle caps of ...

Here are a few pics. You can see where the connector and where they solder. Two of them solder in just below where the RS232/20ma loop selection is. Based on docs it looks like I'm set up for serial. But I don't know what to make of those little caps/resistors/? that are soldered in where the baud r...

Hi there, Thanks to Dave and others for inviting me here. I have an OSI 500 board. I believe it may have been used previously in a system -- maybe just a Superkit or perhaps a Challenger. What I've been trying to do is get it working on serial, but there's no signs of life. I have -9V and 5V+ confir...