Upgrading a KDF-11B ROMs for MSCP Bootstrap (disassembling a bootstrap ROM?)

From: Ed Kelleher <Pres_at_macro-inc.com>
Date: Wed Jun 30 08:08:34 2004

At 02:48 PM 6/28/2004, you wrote:
> > I have a KDF-11B (that's the quad sized PDP-11/23+ CPU with onboard
> > serial ports and bootstrap/terminator) that's too old to know how to
> > boot from MSCP (e.g. RQDX/RD5x) drives. I know later versions of
>this
> > board could do that and I was planning to just upgrade the EPROMs on
>my
> > board, but all the later EPROM images are 8K bytes - my board has
>only
> > 2K (2716) 24 pin EPROMS. There's no way (at least no simple way) to
> > install 8K 28pin EPROMs. Actually, the EPROM sockets on my board are
>so
> > close together that I don't think I could get 28 pin devices to fit
>even
> > if I did "flying leads" for the extra 4 pins.
> >

All the KDF11B (M8189) boards have 24pin sockets.
They used Motorola MCM68766 8Kx8 24 pin eproms.
The MicroPDP 11 (vs 11/23+) DEC EPROM numbers I know of are:

183E4/184E4 - KDF11-BE
380E4/381E4 - KDF11-BH
453E4/454E4 - KDF11-BJ

All have DU boot, the latter has an MU boot as well.

I have a set of the 183E4/184E4 EPROMs with DU boot for KDF11-B, M8189
modules that I'd trade for an RQDX3.

Ed Kelleher
Columbia, SC
Received on Wed Jun 30 2004 - 08:08:34 BST