SLIP is a SLIP-TNC application, designed for the MCB152 board, extended
with a Baycom modem, thus external clocking and HDLC encoding in NRZ
format. The firmware does a full commercial modem emulation on PC side,
and communicates on-air using an unnumbered UI/IP AX.25 connection. AX.25
encapsulation/decapsulation is done internally.

Version 1.0
===========
- No LSC initialisation, firmware upload baudrate is used.
- AT command interpreter with basic AT instructionset, inclusive A/
- multi-command support in one line.
- +++ and ATH support to switch from on-line to command mode.
- Internal AX.25 encapsulation/decapsulation.
- AX.25 header filtering in RX.
- internal RX-frame statistics generation.

Version 1.0a
============
- fixed some minor bugs
- txdelay, persistance, slottime and txtail can now be changed
- RX/TX AX.25 controlfield and PID can be changed
- added s-registers for LF,BS and CR
- added framedebugging on LED 4
- added connect message editing
- added tx control status information

Version 2.0a (17/01/1999)
=========================
- Entire SLIP core is rewritten
- many major bugs fixed
- IO to host is now completely interrupt driven. By doing this, a bug got fixed that
  probably took over 90% of the CPU-time.
- automatic baudrate detection on first character. This enables communication at higher
  baudrates than the DOS COPY command allows.
- DAMA bug removed
- AX.25 version identification is now implemented
- corrected command/respond bit handling
- full and dynamic support of digipeating according to AX.25 v2.2 standard
- better and more dynamic decoding of received frames
- corrected poll/final bit handling
- completely rewritten AT-command interpreter
- ATx0 bug is now fixed (ATx now equals ATx0).
- &RXP and &TXP are replaced by &PID to match protocol identifier of rx and tx frames
- &RXC and &TXC are replaced by &CTL or &CTRL to match protocol identifier of rx and tx frames
- AT commandset is extended with dummies (ATMx,ATBx,... now don't generate errors)
- added possibility to insert AT between every command (ATE1I4 can be written as AT E1 AT I4)
- commands receiving callsigns do not have to be on the end of the line anymore.
  ATCON1DDS
  ATDTON0BAF.10
  can now be replaced by the single line ATCON1DDS,ATDTON0BAF.10 
- complete 20x4 LCD display driver implemented. This gives a full analysis of the 
  dataflow detected on the packetnetwork.
- countless small bugs fixed

Version 2.01 (19/01/1999)
=========================
- buffering mechanism improved which gives better performance
- sourcecode better structured
- sourcecode better documented

Version 2.02 (01/02/1999)
=========================
- fixed bug when disconnecting without having an LCD display
- extended the on-screen analysis of received and transmitted frames
- optimised LCD trace for 2x16 LCD displays.