MONOLITHIC SYSTEMS, INC. (COLORADO MSI)
MICROFRAME 486M
|
Processor |
80486DX |
|
Processor Speed |
25MHz |
|
Chip Set |
C & T |
|
Max. Onboard DRAM |
8MB |
|
Cache |
None |
|
BIOS |
Quadtel |
|
Dimensions |
330.2mm x 221mm |
|
I/O Options |
32-bit external memory card slot |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J1 |
Turbo LED |
J10 |
|
Drive active LED |
J3 |
CPU ready LED |
J11 |
|
Front panel ribbon cable |
J6 |
Speaker |
J19 |
|
Reset switch |
J7 |
Power LED & keylock |
J40 |
|
Auxiliary keyboard |
J8 |
32-bit external memory card |
S1 |
|
Note:If the front panel Drive LED is to be used, the drive active signal from the drive or drive controller must be connected to J3/pins 1 & 2 or J3/pins 2 & 3. | |||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
CMOS memory normal operation |
J2 |
Open | |
|
CMOS memory clear |
J2 |
Closed | |
|
DMA active signal select high |
J12 |
Closed | |
|
DMA active signal select low |
J12 |
Open | |
|
NPU parity check enabled |
J13 |
Closed | |
|
NPU parity check disabled |
J13 |
Open | |
|
Internal CPU cache enabled |
J16 |
Closed | |
|
Internal CPU cache disabled |
J16 |
Open | |
|
NPU zero wait state enabled |
J17 |
Closed | |
|
NPU zero wait state disabled |
J17 |
Open | |
|
Internal CPU caching of BIOS disabled |
J18 |
pins 1 & 2 open | |
|
Internal CPU caching of BIOS enabled |
J18 |
pins 1 & 2 closed | |
|
Í Factory test jumper- do not alter |
J24 |
Closed | |
|
POST enabled |
J25 |
Closed | |
|
POST disabled |
J25 |
Open | |
|
Factory test jumper - do not alter |
J26 |
Closed | |
|
NPU disabled |
J33 |
Open | |
|
NPU enabled |
J33 |
Closed | |
|
Factory test jumper - do not alter |
J34 |
Closed | |
|
Factory test jumper - do not alter |
J35 |
Closed | |
|
Factory test jumper - do not alter |
J36 |
Closed | |
|
Monitor type select color |
J39 |
pins 2 & 3 closed | |
|
Monitor type select monochrome |
J39 |
pins 1 & 2 closed | |
|
Note:Locations of J18, J34, J35, & J36 are unknown. | |||
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
J6 - RIBBON CABLE CONNECTOR PIN ASSIGNMENTS |
|
|
