1. The PAS SCSI controller driver mamv1.sys dislikes having bits 0-6 set when a transfer has completed, take account from this, fixes mamv1.sys incomplete CD transfers (bits 0-6 get re-enabled when the transfer is ongoing).
2. I now understand why the T128 doesn't have a block count register, it does the block count manually from the SCSI layer directly, this fixes Pseudo-DMA transfers when using, e.g.: CD transfers using a sector size of 2340 bytes.
1. Avoid audio stops when they don't need to be.
2. And improved the MMIO-based NCR 53c400 timings to be similar to the port I/O-based one (T130B).
3. Minor timing fixes to the T128/PAS as well (especially for the hdd, when entering Windows 1.x using a SCSI HDD).
1. Made as best as possible implementation of the status bits 1-2 of the Trantor 128 so to make a more accurate speed for SCSI devices (CD-ROM and HDD) without stalls.
2. Slightly reorganized the timer of the T128.
1. Separate the SCSI bus functions from NCR 5380 into true general purpose SCSI bus functions, allowing use of future legacy scsi controllers.
2. Corrected NCR 5380 chip period for the SCSI controllers based on that chip so that CD-ROM speed is correct enough per speed tests and no more breakage (I hope, report if they are still there, please!) on desyncs.
3. A NCR 5380 software reset involves asserting an IRQ.
1. Sanity check for the SCSI temp_buffer if it's allocated or not.
2. Data reads and writes in non-DMA mode should be accessible only when DMA mode is Idle (as in, no DMA at all, whereas DMA mode will go to the SCSI controllers' callbacks).
CD-ROM side: fixed a mode sense page (0x08 Sony, used by both Sony and Texel drives) as well as corrected the Toshiba specific drive speeds (bytes_per_second).
NCR 5380 side: split the work into the generic 5380 core and the ASICs into separate sources (53c400 and T128) and added the T228 MCA adapter based on the 128.
