Volex TTX2000 S Issue 1.2: Routine at 15A2

15A2: execute_basic_continue: Setup VARS, E-LINE, and OLDPPC, and prepare to execute CONTINUE.

Used by the routine at parse_download.
This routine replaces code from the OEL Issue 2.3 ROM.
execute_basic_continue	15A2	LD HL,$5CCB	Set HL to $5CCB.
	15A5	LD DE,(prog_length)	Add prog_length.
	15A9	ADD HL,DE	Add prog_length.
	15AA	LD ($5C4B),HL	Store result in VARS.
	15AD	LD DE,(vars_length)	Add vars_length.
	15B1	ADD HL,DE	Add vars_length.
	15B2	LD ($5C59),HL	Store result in E-LINE.
	15B5	LD (HL),$E8	Store $E8 (BASIC CONTINUE token) at address in HL.
	15B7	INC HL	Store $E8 (BASIC CONTINUE token) at address in HL.
	15B8	LD (HL),$0D	Store $0D (BASIC newline) at next address.
	15BA	INC HL	Store $0D (BASIC newline) at next address.
	15BB	LD (HL),$80	Store $80 (BASIC terminator) at next address.
	15BD	INC HL	Store $80 (BASIC terminator) at next address.
	15BE	LD ($5C61),HL	Store next address in WORKSP.
	15C1	LD HL,(start_address)	Copy start_address to OLDPPC.
	15C4	LD ($5C6E),HL	Copy start_address to OLDPPC.
	15C7	LD A,$01	Set OSPPC to $01 and return.
	15C9	LD ($5C70),A
	15CC	RET