Interrupt-Driven Polled Comms; Hcom; Ports - Husky MP2500 Manual

FS3 supports a single internal PC Card. FS/2 does not support PC Cards.

Interrupt-driven polled comms

FS/2 automatically detects when to use interrupt-driven polled comms (in
the comms emulation).
For maximum throughput, MP2500 and FS3 do not, but can be instructed to
use interrupt-driven polled comms by using INT 14H function 33H, so that
programs that disable interrupts and poll the UARTs can still be used.

HCOM

On MP2500, HCOM supports speeds up to 19,200 Baud (38,400 Baud is
not recommended on MP2500).
On FS/2, HCOM supports speeds up to 38,400 Baud.
On FS3, HCOM supports speeds up to 115,000 Baud (with some
limitations).

Ports

MP2500 only supports COM2, on Port 1, a 9 way -type.
MP2500 does not support the Fischer port.
The FS/2 Fischer port is non-standard, requiring a custom driver. The FS3
Fischer port can be configured as a standard COM1 port.
FS/2 supports TTL and RS232 levels on its comms ports; the FS3 only
supports RS232 levels on Port 1 and Port 2 serial ports, and only TTL levels
on Port 3 (Fischer). MP2500 only supports RS232 levels (on Port 1).
FS3 has an infra red port option configurable as COM2, MP2500 and FS/2
do not.
FS3 has a parallel printer port option, MP2500 and FS/2 do not.
Appendix G: MP2500, FS3 and FS/2: 345