pcmhacking.net

Code: Select all

void WriteByte(unsigned char byte)
{
	unsigned char status;

	// Insert byte before checking status
+	DLC_TRANSMIT_FIFO = byte;
+	WasteTime();

	// Status 2 means the transmit buffer is almost full.
	// In that case, pause until there's room in the buffer.
	status = DLC_STATUS & 0x03;

	// TODO: try looping around 0x02 (almost full) rather than 0x03 (full)
	unsigned char loopCount = 0;
	while ((status == 0x02 || status == 0x03) && loopCount < 250)
	{
		loopCount++;

		// With max iterations at 25, we get some 2s and 3s in the loop counter.
		for (int iterations = 0; iterations < 50; iterations++)
			WasteTime();

		ScratchWatchdog();
		status = DLC_STATUS & 0x03;
	}
-	DLC_TRANSMIT_FIFO = byte;
}

Code: Select all

chip init 

Load
$0006 - word_fffffa4c
$6820 - word_fffffa4a
$7020 - word_fffffa4e

$0006 - word_fffffa48

For intel chip only:
before erase or program
bitset #0 word_ffffe2fa
wait till

bit #5 is set at word_fffffa19

after erase or program
bitclear #0 word_ffffe2fa
wait till

bit #5 is cleared at word_fffffa19

amd chip id 22AB 
segments
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