Sherlock: Routine at 23435

23435: Tape Loader: LD_BYTES

Used by the routine at TapeLoader_Game. Calls the ROM tape loader, shows a white border while it runs, and records success or failure in the tape load result.
Arrange the flags the ROM loader expects.
TapeLoader_LoadBytes	23435	INC D	Leave D one below 255 so the block length survives the ROM loader's test.
	23436	EX AF,AF'	Park the header/data marker. A is 0 for a header and 255 for a data block.
	23437	DEC D	Put the block length back. The ROM loader rejects a length whose top byte is 255.
	23438	DI	Disable interrupts so the tape timing is stable.
Show a white border while the tape runs.
	23439	LD A,15	Set a white border ( WHITE) and raise the MIC bit on port 254.
	23441	OUT (254),A
Enter the ROM loader and come back to TapeLoader_AfterBytes.
	23443	LD HL,23450	Push TapeLoader_AfterBytes as the return address.
	23446	PUSH HL	Push TapeLoader_AfterBytes as the return address.
	23447	JP 1378	Jump into LD_BYTES at 1378.
The ROM loader returns here. Restore the border.
TapeLoader_AfterBytes	23450	PUSH AF	Set the border to WHITE, saving flags the ROM loader returned.
	23451	LD A,7
	23453	OUT (254),A
	23455	POP AF	Restore the ROM flags from the stack.
Record success as 1 and failure as 2.
	23456	LD A,1	Record 1 when the block loaded, and 2 when it did not.
	23458	JR C,TapeLoader_StoreResult
	23460	INC A
TapeLoader_StoreResult	23461	LD (23343),A	Store that result in the tape load result (23343).
	23464	DI	Disable interrupts before returning to the caller.
	23465	RET	Return.