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The IBM encoder now works well enough that my USB floppy drive thinks the disk

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is formatted... but has trouble reading sectors above about 1000. Also remember
that encoding MFM needs to keep one bit of state at all times.
This commit is contained in:
David Given
2020-02-14 00:06:51 +01:00
parent e8febe6508
commit d25f96dd24
9 changed files with 375 additions and 31 deletions
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5
arch/amiga/encoder.cc
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@@ -19,6 +19,8 @@ static DoubleFlag postIndexGapMs(
"Post-index gap before first sector header (milliseconds).",
0.5);
static bool lastBit;
static int charToInt(char c)
{
if (isdigit(c))
@@ -51,7 +53,7 @@ static void write_interleaved_bytes(std::vector<bool>& bits, unsigned& cursor, c
{
assert(!(bytes.size() & 3));
Bytes interleaved = amigaInterleave(bytes);
encodeMfm(bits, cursor, interleaved);
encodeMfm(bits, cursor, interleaved, lastBit);
}
static void write_interleaved_bytes(std::vector<bool>& bits, unsigned& cursor, uint32_t data)
@@ -108,6 +110,7 @@ std::unique_ptr<Fluxmap> AmigaEncoder::encode(
unsigned cursor = 0;
fillBitmapTo(bits, cursor, postIndexGapMs * 1000 / clockRateUs, { true, false });
lastBit = false;
for (int sectorId=0; sectorId<AMIGA_SECTORS_PER_TRACK; sectorId++)
{