Apple-2-Tools
/
AppleWin
mirror of https://github.com/AppleWin/AppleWin.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

ReadTrack(): add comment about not being called for every quarter track

This commit is contained in:
tomcw 2022-09-18 13:54:29 +01:00
parent ba52b766aa
commit 2b11261d2c
2 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
source/Disk.cpp
View File

@ -324,6 +324,12 @@ void Disk2InterfaceCard::ReadTrack(const int drive, ULONG uExecutedCycles)
}
else
{
// NB. This function is only called for a new track when there's a latch read, ie. only for *even* DEVICE SELECT I/O accesses.
// . So when seeking across tracks (ie. sequencing through the magnet phases), then not all (quarter) tracks will need reading.
// . eg. for 'Balance of Power'(GH#1022), for seek T00->T35: this only reads: 00.00, 00.25, 00.75, 01.25, 01.75, ... 34.25, 34.75, 35.00 (skipping the NN.00, NN.50 tracks).
// . And so the bitOffset "round-up" below isn't called for every track.
// TODO: consider forcing this function be be called for every track (and appropriately adjust the "round-up" amount - ie. halve it)
_ASSERT(pFloppy->m_nibbles && pFloppy->m_bitCount);
if (pFloppy->m_nibbles == 0 || pFloppy->m_bitCount == 0)
{
@ -336,7 +342,9 @@ void Disk2InterfaceCard::ReadTrack(const int drive, ULONG uExecutedCycles)
if (pFloppy->m_bitOffset >= pFloppy->m_bitCount)
pFloppy->m_bitOffset = 0;
//LogOutput("T%05.2f: %04X->%04X, Len=%04X\n", pDrive->m_phasePrecise / 2, currentBitPosition, pFloppy->m_bitOffset, pFloppy->m_bitCount);
#if LOG_DISK_WOZ_READTRACK
LOG_DISK("T%05.2f: %04X->%04X, Len=%04X\n", pDrive->m_phasePrecise / 2, currentBitPosition, pFloppy->m_bitOffset, pFloppy->m_bitCount);
#endif
pFloppy->m_byte = pFloppy->m_bitOffset / 8;
pFloppy->m_bitMask = 1 << (7 - (pFloppy->m_bitOffset % 8));

1
source/DiskLog.h
View File

@ -14,6 +14,7 @@
#define LOG_DISK_NIBBLES_USE_RUNTIME_VAR 1
#define LOG_DISK_WOZ_LOADWRITE 1
#define LOG_DISK_WOZ_SHIFTWRITE 1
#define LOG_DISK_WOZ_READTRACK 1
#define LOG_DISK_WOZ_TRACK_SEAM 1
// __VA_ARGS__ not supported on MSVC++ .NET 7.x