Difference between revisions of "Rombo Rombox"
(→Technical) |
|||
| Line 3: | Line 3: | ||
== Technical == | == Technical == | ||
| − | ROM I/O port | + | The rom board has 8 rom slots which can be individually enabled using the dipswitches. |
| − | ROM ids are fully decoded. | + | A link allows the roms to use the ids of 0-7 or 8-15. |
| − | + | ||
| + | 0-7 is compatible with the firmware in the 464 which is limited to 8 roms. | ||
| + | 0-7 or 8-15 is compatible with the firmware in the 6128 and Plus. | ||
| + | |||
| + | NOTE: Some 6128's may not support ROM 7 being overridden so if you use the range 0-7 then you should disable slot 7. | ||
| + | |||
| + | Testing was done by user ngroom on his Rombo Rom board. | ||
| + | |||
| + | The I/O port used to select the rom (dfxx) is decoded partially and only checks A13=0 like other rom boards. | ||
| + | |||
| + | ROM ids are 8-bit and fully decoded. If range 8-15 is selected with the link then you see a rom in slot '0' in 8 only. It is not show in any other slots. I.e. it's not repeated. | ||
== Pictures == | == Pictures == | ||
Revision as of 16:00, 3 March 2017
A ROM expansion board from Rombo Productions.
Technical
The rom board has 8 rom slots which can be individually enabled using the dipswitches. A link allows the roms to use the ids of 0-7 or 8-15.
0-7 is compatible with the firmware in the 464 which is limited to 8 roms. 0-7 or 8-15 is compatible with the firmware in the 6128 and Plus.
NOTE: Some 6128's may not support ROM 7 being overridden so if you use the range 0-7 then you should disable slot 7.
Testing was done by user ngroom on his Rombo Rom board.
The I/O port used to select the rom (dfxx) is decoded partially and only checks A13=0 like other rom boards.
ROM ids are 8-bit and fully decoded. If range 8-15 is selected with the link then you see a rom in slot '0' in 8 only. It is not show in any other slots. I.e. it's not repeated.
Pictures
- Rombo Rombox
A through bus expansion to connect other devices
Inside
Roms individually configurable
PCB Top
PCB Bottom
