5 Feb
2006
5 Feb
'06
7:45 p.m.
On 2/6/06, Don North <ak6dn at mindspring.com> wrote:
Wai-Sun Chia wrote:
Hey, thanks for the detailed slot hacking procedures! :-)
I didn't know that one could use a MS11-Px and save 3 slots tto get
1MB on a 11/44!!
So theoretically I can cram 4 MS11-Px boards to achieve full 22bits
(4MB) RAM on a 11/44??
Quick one:
Can I plug a M7891-DA into a 11/44?
This is supposed to be 128kW MOS RAM for the 11/24 and 11/34A...
BTW, what kinds of memory options/expansions does a 11/44 have?
I believe the M7891 (MS11-Lx) is compatible with the 11/44 memory slots,
but it needs to have some jumpers changed to allow this:
1) Change from MODIFIED UNIBUS (MUD, 18b) to EXTENDED UNIBUS (EUB, 22b)
decoding.
Jumper W4: MOD/IN EUB/OUT
2) Change from +15V supply (MUD slot) to +12V supply (EUB slot, 11/44
backplane).
Jumpers W1&W2: +15v/W1-OUT,W2-IN +12v/W1-IN,W2-OUT
The MS11-Lx is a parity module, up to 256KB density. More standard
memory options for the 11/44 would be MS11-Mx 256KB ECC, and MS11-Px
1024KB ECC.