First version.
Incorrect RS-232 communication and handshaking (the 1200 Bauds speed does not work correctly).
No fine tuning rate (RUN key).
2- 7DEJD0072A VERSION (2764).
New memory variables (in the internal CPU RAM and the external RAM).
New subroutines.
New DOWN/UP keys control.
W1 and W2 jumpers control for frequencies restriction.
New RS232 and RTTY control (bug correction).
Fine tuning rate by pressing the RUN key (fine or course step).
3- 7DEJD0072B VERSION (2764).
New code instructions on 2 bytes (3 before).
Bug correction.
4- 7DEJD0072C VERSION (2764).
New W1 and W2 jumpers control for frequencies restriction (129 KHz to 30 MHz).
New SCAN control.
New BFO control with H1 / I1 RS-232 commands.
New control of printer STROBE/ signal (bug).
New RS-232 commands (J1/J0) ?...
FORM.