The Personal Communications Library for VBDOS (PCL4VB) supports real mode DOS, COM1 through COM20 to 115200, 4+ ports concurrently, many dumb multiport boards, 16550, 16650, 16750 UARTs, interrupt driven, RTS/CTS flow control, any UART address and IRQ, and all memory models. For RS232, RS422, RS485. Supports Microsoft Visual Basic for DOS (VBDOS). Registration is $95 for email delivery.
PCL4VB can be used in the development of real mode applications running under DOS. The shareware version of PCL4VB is fully functional.
Current version is 6.2.
Current version is 2.0.