UNIDENTIFIED
VGA GRAPHICS ADAPTER
|
Category |
Video |
|
Video Types Supported |
XVGA |
|
Video Processor |
Trident TVGA 8900 |
|
Highest Resolution Supported |
1024 x768 |
|
Data Bus Type |
16-bit ISA |
|
Memory Type |
DRAM |
|
Maximum Onboard Memory |
2MB |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
15-pin analog video port |
CN1 |
9-pin TTL port |
CN3 |
|
VGA feature connector |
CN2 | ||
|
INTERRUPT | ||
|
IRQ9 |
J1 | |
|
Disabled |
Pins 2 & 3 closed | |
|
Enabled |
Pins 1 & 2 closed | |
|
MONITOR SELECT | ||
|
Setting |
SW1/A |
SW1/B |
|
VBA |
On |
On |
|
EGA |
Off |
On |
|
CGA |
On |
Off |
|
MDA/Hercules |
Off |
Off |
|
Note:SW1/A & B affects 9-pin TTL connection. Not present on all cards. | ||
|
REFRESH RATE | |
|
Rate |
SW1/C |
|
Less than 48MHz |
On |
|
48-49MHz |
Off |
|
ADDRESS DECODE | ||
|
Setting |
SW1/E | |
|
Fast address decode |
Off | |
|
Slow address decode |
On | |
|
8/16 BUS SELECT | ||
|
Setting |
SW1/F | |
|
16-bit |
Off | |
|
8-bit |
On | |
|
BUS SIZE DETECTION | |
|
Setting |
J2 |
|
Autodetect |
Pins 2 & 3 closed |
|
Standard interface |
Pins 1 & 2 closed |
|
Note: J2 orientation varies. Check pin numbers on card. | |
|
CLOCK SPEED | ||
|
Setting |
J4 | |
|
40MHz(512KB) |
Pins 2 & 3 closed | |
|
48Mhz(1 & 2MB) |
Pins 1 & 2 closed | |
|
Note: Location of J4 unidentified. Not present on all cards. | ||
|
DRAM SIZE | |||
|
Size |
JP1 |
JP2 |
J3 |
|
512KB |
Open |
Closed |
Pins 1 & 2, 4 & 5 closed |
|
1MB |
Open |
Closed |
Pins 1 & 4, 2 & 5 closed |
|
2MB |
Closed |
Open |
Pins 2 & 3, 5 & 6 closed |
|
Note: JP1 & 2 are jumper blocks, number of pins unidentified. Not present on all cards. Orientation of J3 unidentified | |||
|
DRAM CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
|
512KB |
(2)256KB x 4 |
None |
None |
|
1MB |
(2)256KB x 4 |
(2)256KB x 4 |
None |
|
2MB |
(2)256KB x 4 |
(2)256KB x 4 |
(4)256KB x 4 |
|
Note: DRAM not configurable on all cards. | |||
|
FACTORY CONFIGURED SETTINGS | |
|
Switch |
Position |
|
SW1/D |
On |