| Manufacturer: |
RocTec |
| Name: |
RM2MC |
| Connect |
Trapdoor A500 + Gary & CPU Socket |
| |
512 Kb of the card can be used as extra chip memory if the A500 has a Super Angnus ( 8372 ). Possibility to use from 512 kb to 2 Mb by setting the jumpers.
Real Time Clock.
External On/Off switch.
Ram Chips CMOS 4 x 256 Dynamic RAM Chip , 100ns or faster in groups of four .
|
This is a 2MB Ram Module for the A500
It can work as 0.5, 1.0, 1.5, 1.8 and 2.0MB upgrade depending on jumper settings and chip population.
The board works with Kickstart 1.3
If there are no Gary adapter, nor CPU adapter the card works as a regular 512KB slow mem upgrade.
The jumpers can be set all at once, giving a total of 1MB Chip and 1.5MB Slow
Removing Jumper 0 (chip mem), will grant max 1.8MB Slow mem.
Jumper 0 is accessible from the bottom of the Amiga giving easier access to remove chipmem,
while jumper 1 and 2 can be accessed after removing the board.
Jumper config
0 | 1 | 2
------------
1 | 1 | 1 0.5MB Chip, 1.5MB Slow
1 | 1 | 0 1.0MB Slow (This seems to disable chipmem)
1 | 0 | 1 0.5MB Chip, 1.0MB Slow
1 | 0 | 0 0.5MB Chip, 0.5MB Slow
0 | 1 | 1 1.8MB Slow
0 | 1 | 0 1.5MB Slow
0 | 0 | 1 1.0MB Slow
0 | 0 | 0 0.5MB Slow
NOTE: It's easy to spot pin 1 for the cables that connect the Gary adapter with the CPU adapter and RAM card, as it's marked by it's own square.
a 3 wire and a 5 wire cable is required for full function.