Digitalker 54104 IC

Jim Brain brain at
Tue Feb 9 22:02:20 CST 2021

I suspect the answer to question #1 is no, but thought I would ask.

1) Anyone happen to have a known working Digitalker 54104 IC they are 
looking to trade for some cash that does not involve me selling an arm 
or a leg :-)?

2) Barring that, anyone have a known working Digitalker-based unit that 
might be able to pop in a suspected non working Digitalker IC and test?

I have a Jameco (yep, the parts firm) manufactured Digitalker unit here 
called the JE-520 that is my original unit.  It suffered some ROM bit 
rot long ago and was not working, but I acquired the ROMs a while back 
to repair the unit.

Now, though, as I pull it out for another project, it seems to be 
misbehaving.  It's like "address bit 1" on the input commands is acting 
up.  For instance, word 48 is "zero", and 49 is "one", but zero will be 
followed by "three" and then "zero" and then "three" as one sends values 
48,49,50,51 to the unit.  I'm working to confirm the bit 1 on the cable 
to the PC is not bad, but initial efforts point to it being the IC.


Jim Brain
brain at

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