The modification is a FULL expansion RAM (37K) and an alternative kernal,
all on board leaving the cartridge expansion free for user ,
the RAM/Kernel setting are chosen (during HW reset) through the function keys: no hole on case!
HW reset can be generated by continuos pressing of "RESTORE" key.
Code: Select all
continuous pressing of RESTORE will generate a HW RESET,
during HW RESET the function keys could select:
_____________________________________________________
| | 3k RAM | 16k | 8k | 2K | 8k |
| F5 F3 F1 | 1+2+3 | BLK1+2 | BLK3 | I/O2+3 | BLK5 |
|__________|________|________|______|________|________|
| -- -- -- | -- | -- | -- | -- | -- |
| -- -- ** | ** | ** | -- | -- | -- |
| -- ** -- | ** | -- | -- | -- | -- |
| -- ** ** | ** | ** | ** | -- | -- |
| ** -- -- | ** | ** | ** | -- | ** |
| ** -- ** | ** | ** | ** | -- | R.ONLY |
| ** ** -- | ** | ** | ** | ** | ** |
| ** ** ** | ** | ** | ** | ** | R.ONLY |
|__________|________|________|______|________|________|
(R.ONLY = Read only: ROM emulation)
F7= second kernal (JDos + cartridge autostart disabled)