PPI Mercury 040

Processor: 040@28Mhz, 040@33Mhz or 040@35Mhz
Max Ram: 32MB. 4 x 30pin SIMMs (Static Column, Fast Page or Nibble)

Requires 2.04 ROMS or higher.

There are 5 banks of jumpers on the Mercury as follows. (NOTE: O = Open, X = Closed)

Jumper bank A speciies Mercury's CPU speed
33Mhz 28Mhz Bank A
40ns 60ns X X
60ns 80ns X O
80ns 100ns O X

Jumper bank B specifies how much memory is on the Mercury.
Memory 1MB x 8 4MB x 8 Bank 0 Bank 1 Jumpers
0MB NONE NONE NONE NONE O X X X
4MB 4 NONE 1MB x 8 NONE O X O X
8MB 8 NONE 1MB x 8 1MB x 8 O X O O
16MB NONE 4 4MB x 8 NONE O O X O
20MB 4 4 4MB x 8 1MB x 8 O O O X
20MB 4 4 1MB x 8 4MB x 8 O O X X
32MB NONE 8 4MB x 8 4MB x 8 O O O O

Jumper bank C specifies the Mercury's powerup settings.

C1 = Processor select (Powerup default)
O = 68040 (default)
X = 68030
(There is a 'switch' program to switch between 030 and 040, requires a reboot once used)

C2 = Cache
X = Enabled (default)
O = Disabled

C3 = Off-Board burst
X = Disabled (default)
O = Enabled

C4 = On-Board burst
X = Enabled
O = Disabled (default)

Jumper bank D specifies miscellaneous settings

D1 = Reserved (DO NOT JUMPER!)

D2 = FastROM option
X = Disabled
O = Enabled (default)
(This reserves 1 MB of the Mercury's onboard memory for FastROM use. If enabled in software aswell the systems ROM's are copied as well) Jumper E is reserved

Thanks to Thomas Newsom