The Microcontroller Idea Book - Jan Axelson's Lakeview Research

Chapter 4
If BASIC-52 is unable to program the chip, you’ll see this:
ERROR: PROGRAMMING
If you get this error message, double-check your wiring. When the programming command
executes, pins 20, 22, and 27 should toggle, along with the address and data lines.
Running a Stored Program
When you have a program saved, you can run it from the NV memory. BASIC-52’s RAM
and ROM commands switch from RAM mode, where BASIC-52 runs the program stored
in RAM (U7), to ROM mode, where it looks in U8 for programs to run. When you’ve
programmed successfully, run your program by typing
ROM
RUN
or
RROM
You can store multiple programs, space permitting, and run each by specifying its number.
For example, to run the second program stored, type
RROM2
To return to editing programs in RAM, type
RAM
Another useful command is XFER. In ROM mode, type
XFER
to copy the current program from ROM into RAM, where you can edit it, and then use
FPROG to store the revised version in U8 if you wish.
Adding Bootup Options
The commands FPROG1-FPROG6 enable you to store additional information besides
programs. FPROG1 saves the current baud rate and causes BASIC-52 to boot immediately
to the READY prompt, without waiting to receive a SPACE character. FPROG2 saves the
current baud rate and also tells BASIC-52 to automatically run the first program in NV
54 The Microcontroller Idea Book