Digitalker 54104 IC

Jim Brain brain at
Sat Feb 13 04:11:55 CST 2021

On 2/13/2021 3:13 AM, ED SHARPE via cctalk wrote:
> oddly... I still have the  prototype  unit  we  built   to plug into  HP 2000 series processors and   21mx  processors.  it  sits in my den...I  was  looking  at  it the other day!  and  then  your message popped  up/ What are looking   for  I  am not  sure  I  got  all the prior  emails  on  this.... Ed#     In a message dated 2/12/2021 4:01:25 PM US Mountain Standard Time, cctalk at writes:
> On 2/11/2021 6:02 PM, ED SHARPE via cctalk wrote:
>> Most challanging was to figure out to make it say naughty things... and once you did  how it almost caused havoc in AZ
> Sounds like a story to add detail around...
> But, I'm sad because no one either has one nor can help me test this
> one.  So, I cannot enjoy the thrill of making it say inappropriate stuff :-(

-------- Forwarded Message --------
Subject: 	Digitalker 54104 IC
Date: 	Tue, 9 Feb 2021 22:02:20 -0600
From: 	Jim Brain <brain at>
To: 	General Discussion: On-Topic and Off-Topic Posts 
<cctalk at>

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

Jim Brain
brain at

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