AT COMBO CARD IO card Settings and Configuration
APPARAT, INC.
AT COMBO CARD
Card Type | Multi-I/O |
Chipset | Unidentified |
Maximum Onboard Memory | 3MB DRAM |
I/O Options | Parallel port, serial port |
Data Bus | 16-bit ISA |
CONNECTIONS | |||
Function | Label | Function | Label |
Serial port | CN1 | Parallel port | CN2 |
USER CONFIGURABLE SETTINGS | ||
Setting | Label | Position |
Serial port address set to COM1: (3F8h) | E1 | Pins 2 & 3 closed |
Serial port address set to COM2: (2F8h) | E1 | Pins 1 & 2 closed |
Parallel port address set to 378h | E3 | Pins 2 & 3 closed |
Parallel port address set to 278h | E3 | Pins 1 & 2 closed |
Serial port enabled | E5 | Closed |
Serial port disabled | E5 | Open |
Parallel port enabled | E6 | Closed |
Parallel port disabled | E6 | Open |
Note:Disabling a port does not disable its respective interrupt; this must be done with the interrupt setting jumpers. | ||
STARTING MEMORY ADDRESS SELECTION | |||
Setting | System Board Memory | SW1/1 | SW1/2 |
256KB | 256KB | On | On |
512KB | 512KB | On | Off |
1024KB | 640KB | Off | On |
1408KB | 1MB | Off | Off |
DRAM CONFIGURATION | ||||||
Starting Address Setting | Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank 4 | Bank 5 |
256KB | (18) 256K x 1 | None | None | None | None | None |
256KB | (18) 256K x 1 | (18) 256K x 1 | None | None | None | None |
256KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None | None |
256KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None |
256KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None |
256KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 |
512KB | (18) 64K x 1 | None | None | None | None | None |
512KB | (18) 64K x 1 | (18) 256K x 1 | None | None | None | None |
512KB | (18) 64K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None | None |
512KB | (18) 64K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None |
512KB | (18) 64K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None |
512KB | (18) 64K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 |
1024KB | (18) 256K x 1 | (18) 256K x 1 | None | None | None | None |
1024KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None | None |
1024KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None |
1024KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None |
1024KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 |
1408KB | (18) 256K x 1 | (18) 256K x 1 | None | None | None | None |
1408KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None | None |
1408KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None | None |
1408KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | None |
1408KB | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 | (18) 256K x 1 |
Note:Bank 0 may be used for either base (conventional) or extended memory, but not both. Therefore, when the starting address is set to either 256KB or 512KB, Bank 0 is used to raise the base memory to 640KB. Any remaining memory in Bank 0 is ignored. | ||||||
DRAM SWITCH CONFIGURATION | ||||||
Number Banks Installed | SW1/3 | SW1/4 | SW1/5 | SW1/6 | SW1/7 | SW1/8 |
1 | On | Off | Off | Off | Off | Off |
2 | On | On | Off | Off | Off | Off |
3 | On | On | On | Off | Off | Off |
4 | On | On | On | On | Off | Off |
5 | On | On | On | On | On | Off |
6 | On | On | On | On | On | On |
Note:SW1/3 to SW1/8 enable Banks 0 through 5 respectively. Banks 3, 4, and 5 are located on a daughterboard. The locations of the memory and daughterboard headers are unidentified. | ||||||
SERIAL PORT INTERRUPT SELECTION | |
Setting | E2 |
IRQ3 | Pins 1 & 2 closed |
IRQ4 | Pins 2 & 3 closed |
Disabled | Open |
PARALLEL PORT INTERRUPT SELECTION | |
Setting | E4 |
IRQ5 | Pins 1 & 2 closed |
IRQ7 | Pins 2 & 3 closed |
Disabled | Open |
MISCELLANEOUS NOTES |
The banks on the AT Combo card must be completely populated before the daughterboard can be used. The daughterboard contains banks 3 through 5. |
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