More Info (was Re: HP 2100S microcode blanks?)

From: Joe R. <rigdonj_at_cfl.rr.com>
Date: Thu Feb 3 19:02:58 2005

Jay,

  If it uses a Harris 7611 then these sound like the same PROMS that are
used as Boot PROMs for the HP 1000s. I have data books/sheets for several
of them and somewhere on Al's site is a cross-reference of equivilent
PROMs. Note that "equivilent" means that they read the same but they still
use very different programming voltages and techniques so you must have the
proper programming adapter and settings for them. That's probably why Bob
Shannon has had mixed results programming them.

  Joe

PS Just found this in an old message from Al:


256*4
   +------+
A6 |1 16| Vcc
A5 |2 15| A7
A4 |3 14| CE2/
A3 |4 13| CE1/
A0 |5 12| O1
A1 |6 11| O2
A2 |7 10| O3
GND|8 9| O4
   +------+

   Signetics MMI TI Harris Raytheon AMD National Intel
   --------- --- -- ------ -------- --- -------- -----
TS 82S129 (50ns) 6301-1 24S10 7611-5 29661 27S21 74S287 3621
   82S129A(27ns) 63S141 - 7611A - 27S21A - -


   Joe


At 04:12 PM 2/3/05 -0600, you wrote:
>I did find some chips on a microcode board that tell me what chips they are.
>
>However, I can't find any source for those chips, and I can't find any list
>of substitutions!!
>
>The part is Harris M1-7611-5 8211
>
>I'm assuming 8211 is the date code. This chip isn't in the databooks I have.
>Anyone have a clue as to a substitution part? A datasheet on the original
>part would be a help too.
>
>THANKS!
>
>Jay
>
>
>
Received on Thu Feb 03 2005 - 19:02:58 GMT