BASIC Escape Codes
==================
ESC/A - Cursor UP
ESC/B - Cursor DOWN
ESC/C - Cursor RIGHT
ESC/D - Cursor LEFT
ESC/E - Cursor Home
ESC/J - Erase EOP
ESC/K - Erase to EOL
ESC/L - Scroll up to cursor.
ESC/M - Scroll down from cursor.
ESC/P - Turn on the cursor.
ESC/Q - Turn off the cursor.
ESC/T - Protect screen line 7.
ESC/U - Remove line 7 protection.
ESC/V - Inhibit scrolling.
ESC/W - Enable scrolling.
ESC/Y+yx - locate the cursor to yx-32
ESC/j - Clear Screen
ESC/l - Erase Line
ESC/p - Turn on reverse video.
ESC/q - Turn off reverse video.

Address	Contents
=======	========
F5F0	Value of MAXRAM
F661	CALL target address
F678	Top of free RAM
F962	Address of RAM directory
FAAF	Location of IPL string
FAC0	Start of RAM address
FB65	Type of data in accumulator
	  2=Integer
	  3=String
	  4=Single precision
	  8=Double precision
FBB2	Pointer to simple variables
FBB4	Pointer to array variables
FB89	String descriptor (see 275D)
FBB2	Next free RAM address
FC1A	Software accumulator
FC82	MAXFILES value
FC83	Pointer to BASIC file tables

Subroutines
===========
RST 4
Outputs contents of A register to 
display.

RST 8
Checks (HL) against byte following the 
RST command. Reports SN error if not the
same value.

275D
Gets string space for the length 
specified in A. The descriptor is stored
at FB89.

4222
Perform CR/LF on display.

4790
Looks up (or creates) variable pointed 
to by HL. Address returned in DE.

52BB
Place telephone on hook.

52D0
Take telephone off hook.

532D
Dial telephone number pointed to by HL.

6D3F
Sends the character in A to the parallel
printer port.

7283
Scan the keyboard, return key in A. If 
no key the Z flag is set.