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