Re: CBM-II solderless memory expansion

From: Michał Pleban <*lists_at_michau.name*> Date: Sat, 14 Apr 2018 02:21:51 +0200 Message-ID: <5AD1499F.4030102@michau.name> · lists_at_michau.name

Hello!

Mike Naberezny wrote:

> In the mid-1980's, a member of the Chicago B128 Users Group (CBUG)
> produced a plug-in board called B1024.  It provides 1 megabyte using
> 41256 DRAMs.
> 
> I have a B1024 board put some information about it here:
> http://mikenaberezny.com/hardware/cbm-ii/b1024-ram-expansion-board/

That looks intresting! But judging from the photo and the components on
the board, it reproduces Mia's idea of hooking both to the 6509
expansion port aand 8088 memory port in order to replicate the
multiplexers on the mainboard. A good side is that it doesn't require
replacing the PLA or sticking anything into the RAM sockets on the
mainboard. A downside is that it requires lots of additional compoments
to replicate those already on the mainboard.

Regards,
Michau.