*FX138	Insert character code into buffer. (See *FX21 for a list of buffer
	numbers.) For example:
	*FX138,0,65 places ASCII 65 (A) into the keyboard buffer.
*FX139	Select option value (equivalent to *OPT).
*FX141	Select ROM filing system (equivalent to *ROM).
*FX142	Enter language ROM.
*FX143	Issue paged ROM service request.
*FX144	Set vertical screen shift and interlace option for next mode
	change or break (equivalent to *TV). For example:
	*FX144,0,1 gives no screen shift and turns the interlace off;
	*FX144,1,0shifts the screen up by one line and turns the
	interlace on;
	*FX144,255 shifts the screen down by one line (and turns the
	interlace on).
*FX146-	Access memory-mapped 1/0 areas.
*FX151
*FX153	Insert character code into buffer, checking for ESCAPE.
*FX154	Write to Video ULA control register.
*FX155	Write to Video ULA palette register.
*FX156	Write to 6850 ACIA control register (part of optional RS232
	interface).
*FX162	Write to EEPROM.
*FX178	Disable keyboard scanning.
*FX179	Write ROM polling sernaphore.
*FX180	Write Operating System High Water Mark (OSHWM).
*FX181	Write RS232 (optional) mode.
*FX190	Write interpretation of ADVAL.
*FX191	Write RS232 (optional) use flag.
*FX193	Write flash counter.
*FX194	Write mark period count.
*FX195	Write space period count.
*FX196	Write keyboard auto-repeat delay.
App 4.5