RE: [N8VEM-S100:1695] 68K Parts List -- 2N3904 TO92-INVERT

Guys I did not “do individual” transistors much in the past so I’m not sure of the differenced discussed below. FWIW, the Reset/POC pulse circuit below has been use on many of our boards and on many of the older S-100 boards in the past. The actual transistor in the past seems to vary, but the circuit is the same.

Looking back the one we use originated from the original Intersystems Z80-II S100 CPU board.

See the manual here:-

http://www.s100computers.com/Hardware%20Folder/Intersystems/Series%20II%20Z80%20CPU/Intersystems%20Z80-II.htm

John

John Monahan Ph.D

e-mail: mon...@vitasoft.org

Text: mon...@txt.att.net

From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Paul Birkel
Sent: Sunday, June 02, 2013 1:23 AM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:1695] 68K Parts List -- 2N3904 TO92-INVERT

Well, maybe. I thought that the wire-lists correlated to the part foot-prints, thus that designation ought to relate to the footprint/pinout, not the logical-function in the circuit?

I guess that Andrew would be the one to clarify on that point? (Of course, anyone who has already-built would know what they successfully installed there ... speak up please :->.)

On Thu, May 30, 2013 at 5:27 AM, Jeff Galinat <jgal...@optonline.net> wrote:

On 5/30/2013 3:25 AM, Paul Birkel wrote:

All;

Regarding the 68K board, the s100_68K V3.lst file specifies that the 2N3904 is a "TO92-INVERT", however examination of the PCB and schematic seem to reveal the usual 1/2/3 E-B-C configuration, rather than the variant E-C-B configuration. Is the "INVERT" designation in the lst-file incorrect and a standard 2N3904 should be used (e.g.: http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/2N3904TA/?qs=sGAEpiMZZMvAvBNgSS9Lqp8aB%2fMLlILd)?

Thanks,

paul

Hi Paul,
My guess is that label was used because the transistor is used as a simple TTL inverter and it may have nothing to do with orientation?
Regards,
Jeff

--
You received this message because you are subscribed to the Google Groups "N8VEM-S100" group.
To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.