DataFlyer 500 schematic..
geneb at deltasoft.com
Sun Jun 6 12:47:25 CDT 2010
On Sat, 5 Jun 2010, Keith wrote:
> Gene Buckle wrote:
>> On Sun, 30 May 2010, Tony Duell wrote:
> Please let us know how you made out with this. There might be some common
> failure pattern that would be nice to know if mine ever gives up the ghost.
I've shelved it until I have the time & patience to remove the caps.
Those are the last things to check.
> There's a ROM on there(DF autoboot ver 2.1 chip), and at least one PAL chip
> (DFS PAL), and maybe another one DTACK?
> Is it worth trying to read the ROM?
I've actually got a dump of a newer ROM rev around here somewhere. I
burned one for a guy that wanted to upgrade his. Been a year or so.
> Is it possible to reverse engineer the PALs by hooking up a logic analyzer?
> Are PALs normally just combinational logic? No timers, counters, storage,
> and so on? Just formulas for combining inputs and producing outputs?
The board still has the +5 to ground short with all the chips pulled. The
only thing left on the board are two electrolytics, two ceramic or
tantalums and a few resistors. The resistors checked out.
When I get a chance to work on it again, I'll let you know what I find.
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