[rescue] ADM3-A lower case ROM

John Hudak jjhudak at gmail.com
Tue Dec 13 00:29:11 CST 2016

ahhh, a blast from the past...SIgnetics 2513 character generator ROM.
These are as scarce as WOMs.
This fellow did a dump of the lower case character generator for the ADM3.
He also has a adapter board that uses a 2716 (you can still find them, but
not for long....)
He also points out (incorrectly i believe) that the cycle time for the 2513
is 400ns....I always remembered 450ns, and I double checked it in my old
Signetics data book.  Unless LearSigler made some special arrangement with
Signetics that I am unaware of.
In any event, you don't want to install that ROM incorrectly....Good luck

BTW, IIRC, the dip switches are the only thing that needs to be changed to
accomodate the lower case ROM....I don't remember what dip switches they

On Mon, Dec 12, 2016 at 6:17 PM, Steve Hatle <shatle at nfldinet.com> wrote:

> -------- Original Message --------
> Hasn't the ROM
> been dumped already? Is it
> one of the early devices with
> unusual voltages,
> complicating the burning of
> replacements? I've got an
> old Needhams EP10 (or
> whatever) somewhere in
> storage, but that's
> probably not going to cut it...
> Willing to work with
> somebody local (SF Bay area) with appropriate
> reader/burner...
> --Steve.
> _______________________________________________
> OK - I found the ROM! A
> friend had one of these terminals in mothballs
> and took out the chip for me.
> Looking at the maintenance manual, once I pop in the ROM it seems I have
> to
> check/set two DIP switches, one on the main circuit board to enable
> upper/lower case display, and one in the set next to the keyboard to
> enable
> generation of lower case characters.
> I haven't looked yet to see what these
> switches are currently set at.
> Can anyone tell me if there's something else
> I'm missing? I don't think
> there's much that can break, but I figured it's
> worth asking since I
> won't get to try it out for a day or so.
> Steve
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

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