Little Board P6d Module

 

 

 

SELIN*

Printer select input

This bit is inverted and output to the pin. It selects a printer.

 

 

 

IRQE

Interrupt request

When set to 1, interrupts are enabled. An interrupt is generated by

 

enable

the positive-going -ACK input.

PCD

Parallel control

When set to 1, port is in input mode. In printer mode, the printer is

 

direction

always in output mode regardless of the state of this bit.

PD0-PD7

Parallel Data Bits

 

 

 

 

Floppy Disk Interface

The on-board floppy disk controller and ROM BIOS support one or two floppy disk drives in any of the standard DOS formats shown in Table 2-24.

Table 2-24. Supported Floppy Formats

Capacity

Drive Size

Tracks

Data Rate

 

 

 

 

360K

5-1/4 inch

40

250KHz

 

 

 

 

1.2M

5-1/4 inch

80

500KHz

 

 

 

 

720K

3-1/2 inch

80

250KHz

 

 

 

 

1.44M

3-1/2 inch

80

500KHz

 

 

 

 

Floppy Drive Considerations

Nearly any type of soft-sectored, single or double-sided, 40 or 80 track, 5-1/4 inch or 3-1/2 inch floppy disk drive is usable with this interface. Using higher quality drives improves system reliability. Here are some considerations about the selection, configuration, and connection of floppy drives to the Little Board P6d module.

Drive Interface—The drives must be compatible with the board’s floppy disk signal interface, as described below. Ampro recommends any standard PC-or AT-compatible 5-1/4 inch or 3-1/2 inch floppy drive.

Drive Quality—Use high quality, DC servo, direct drive motor floppy disk drives. Drive Select Jumpering—Both drives must be jumpered to the second drive select.

Floppy Cable—For systems with two drives, use a floppy cable with conductors 10-16 twisted between the two drives. This is standard practice for PC-compatible systems.

Head Load Jumpering—When using drives with a Head Load option, jumper the drive for head load with motor on rather than head load with drive select. This is the default for PC-compatible drives.

Drive Mounting—If you mount a floppy drive very close to the Little Board or another source of EMI, you may need to place a thin metal shield between the disk drive and the device to reduce the possibility of electromagnetic interference.

Floppy Interface Configuration

The floppy interface is configured using Setup to set the number and type of floppy drives connected to the system. Refer to the Setup section starting on page 2–48 for details.

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Ampro Corporation 5001451A manual Floppy Disk Interface, Floppy Drive Considerations, Floppy Interface Configuration

5001451A specifications

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