48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
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Notes on conversion from win3.1 to NT.
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======================================
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1. Change from MSCDEX to NT CDRom driver IOCTLs.
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-- Driver sharing capabilities (??) - does the driver allow anything ?
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-- Drive labelling (config stuff too).
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Problems :
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Apparently no SCSI-2 command to tell if the tray is open.
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For now the only conditions we detect are the PLAY_STATUS conditions
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and inability to read the TOC. We only read the TOC when asked to
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by CdReady or CdGetNumTracks.
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2. Device sharing implications ??
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Seems at the moment that ANYONE can open CDRom (is it exclusive ?).
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The MCICDA on windows allows sharing between apps. This means we
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need a server implementation or a kernel driver or just proper
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sharing access in the kernel driver (what should be access required
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for playing CDs ?).
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3. Beware track numbering problems - is there always a 1 ?
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4. PAUSE-RESUME. This is effectively NOOPED (or at least the RESUME is).
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So PAUSE always stops.
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Underneath in MSCDEX the thing they're fighting is that PAUSE while
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PAUSEd STOPs (ie forgets its PAUSED). Also MSCDEX calls PAUSE
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STOP.
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In NT to STOP we ... ?
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5. A BASIC problem with the way all this stuff is written is that
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it's written by people all the way over to CDEX land.
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The devices report status AFTER they've tried to do what you want.
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This helps greatly with integrity. The code is written with all
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kinds of defensive test BEFORE issuing a command which is pretty
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bogus.
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6. flip3, flip4 etc. Change these to portable versions where necessary.
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(flip4 seems OK and fits in with other poor implementations).
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