Ref: 09930008
Title: January 1990 Change in EtherStart II PROMs
date: 1/29/90

Copyright 3Com Corporation, 1991.  All rights reserved.

The EtherStart II PROM has been upgraded so that it works with
both the EtherLink II and the new EtherLink II TP adapters.  New
PROMs started shipping in January 1990.  The part number remains
3C503-ES.

PROMs shipped before January 1990 work only in EtherLink II
adapters.  The new PROMs will work with all EtherLink II TP
adapters but only with EtherLink II adapters containing the new
gate array manufactured by IMI.

Note:  If the old PROM is used with an EtherLink II TP adapter,
the error message "Fail bootpc.com, check cable!" will appear
on the screen.


How to Tell the PROMs Apart

The new PROM is marked 0729-63; the old PROM is marked 0729-20.
Also, the outside box label for the new PROM is blue and is marked
"EtherStart II PROM..... for EtherLink II and EtherLink II TP
adapters."  The outside box label for the old PROM is gray and does
not specify the adapter.

The following table shows which PROM is required for each adapter:

Adapter                    Boot PROM
---------------------      ------------
ELII (Old gate array)      0729-20 only
 to 2227-01 rev H
 to 2227-02 rev K

ELII (IMI gate array)      0729-20 or 0729-63
  2227-01 rev I and up
  2227-02 rev L and up
  2227-03 rev A and up

ELII TP                    0729-63


