|
The
68030 SBC-3 |
| Jumpers |
| |
|
Default settings: |
place Jumpers as
shown in RED below |
|
 |
|
|
|
J1 CACHE |
|
|
|
This Jumper
enables/disables the 68030 instruction and data caches. |
|
|
|
J1 open - enabled |
|
J1 short - disabled |
|
|
|
J2 BE - Bus
Error |
| |
|
This Jumper
enables/disables the bus error logic. |
| |
|
J2 open - disabled |
|
J2 short - enabled |
| |
|
J3 DS1 - DSACK1 |
| |
|
This Jumper allows
DSACK1 to be grounded for test purposes. |
| |
|
J3 pins 1-2 short
- normal operation |
|
J3 pins 2-3 short
- DSACK1 grounded |
| |
|
J4 MMU - Memory
Management Unit |
| |
|
This Jumper
enables/disables the 68030 memory management unit. |
| |
|
J4 open - enabled |
|
J4 short - disabled |
| |
|
J5 BVD/SEL - Boot
Vector Disable |
| |
|
This Jumper
enables/disables the BV (Boot Vector) mode. |
| |
|
J5 open - normal
operation |
|
J5 short - RAM
disabled + ROM fixed at 0x000000 |
| |
|
J6 DS0 - DSACK0 |
| |
|
This Jumper allows
DSACK0 to be grounded for test purposes. |
| |
|
J6 pins 1-2 short
- normal operation |
|
J6 pins 2-3 short
- DSACK0 grounded |
| |
|
J7 |
|
|
|
This Jumper |
|
|
|
J8 |
|
|
|
This Jumper |
|
|
|
J9 |
|
|
|
This Jumper |
|
|
|
J10 |
|
|
|
This Jumper |
|
|
|
J11 |
|
|
|
This Jumper |
|
|
|
J12 |
|
|
|
This Jumper |
|
|
|
J13 |
|
|
|
This Jumper |
|
|
|
J14 |
|
|
|
This Jumper |
|
|
|
J15 PWR - IDE
Power |
| |
|
Power (5V DC) is
routed to CN11 (IDE-40W) pin 20 when this Jumper is
shorted. |
| |
| JB1 RCFG -
ROM Configuration |
| |
|
This Jumper Block allows
the installed ROM to be configured as one large ROM or two smaller
Jumper selectable ROM's. |
| |
|
3-4 short |
4MB ROM |
This is
the default
setting for all standard Mega-680x0 System ROM's |
|
1-2 short |
2MB ROM_A * |
|
Upper |
2MB of
4MB ROM mapped to address space |
|
|
5-6 short |
2MB ROM_B * |
|
Lower |
2MB of
4MB ROM mapped to address space |
|
|
| |
|
* The ROM repeats
twice within the 4MB address space |
| |
| JB2 STXSF -
Serial TX & Software Features |
| |
|
The following JB2
links control serial data transmission from the board: |
| |
|
1-2 short |
USB1
(CON) TX enabled |
|
3-4 short |
USB2
(AUX) TX enabled |
|
| |
|
The remaining JB2
links control software features within System ROM V2.0x
as follows: |
| |
|
5-6 short |
115K baud DUART (XR68C681) support enabled |
|
7-8 short |
N/A |
|
9-10 short |
ROM diagnostics
(Slow Boot)
enabled |
|
11-12
short |
ACRTC
graphics test
enabled |
|
|
| |
| |