* Updated machine/acorn_bmu.cpp, machine/i2cmem.cpp, machine/pcf8573.cpp and machine/machine/pcf8583.cpp.
* Check device ID and only acknowledge device’s own ID.
* Release SDA line to be pulled up when idle.
* aa310.cpp: Combine SDA lines with logical AND.
iwm: Increate the flux write buffer size for better performance (complete sector write in a single call)
2gs: Correct the q3 clock value, making (sync) writes reliable
iwm: Increate the flux write buffer size for better performance (complete sector write in a single call)
2gs: Correct the q3 clock value, making (sync) writes reliable
z80scc: Removed unused Z80SCC_USE_LOCAL_BRG and simplified
WR15_ZEROCOUNT usage to reduce the likelihood of needless timer
activation.
mips3drc: Additional micro-optimizations to generate_checksum_block.
z80scc: Removed unused Z80SCC_USE_LOCAL_BRG and simplified
WR15_ZEROCOUNT usage to reduce the likelihood of needless timer
activation.
mips3drc: Additional micro-optimizations to generate_checksum_block.
Partially reverts an old commit from @Robbbert (2479398533) where the floppy device was (mistakenly?) set to FLOPPY_525_QD (quad density) from FLOPPY_525_SSDD (single-sided double-density).
As far as I am aware, the Osborne1 only supported SSSD and SSDD disks. Revert appears to resolve known Osborne1 issues [5792](https://mametesters.org/view.php?id=5792) (thanks to @Osso13 for pointing this out) and [8100](https://mametesters.org/view.php?id=8100) @cuavas.
* spectrum_cass.xml: Added one game and a couple of demos
Just noticed that the only way to play the Spectrum version of Inspector Gadget was through its Russian bootleg arcade game "Brodjaga", so I added its only official release (was cancelled in the UK but released in Spain).
Also added a couple of demos that I found laying around in a very old backup, and which aren't already included in any cover tapes:
-LSD Megademo
-The Ren and Stimpy Slideshow (a kind of lame slideshow of a few black and white pics, but with a decent presentation)
Partially reverts an old commit from @Robbbert (2479398533) where the floppy device was (mistakenly?) set to FLOPPY_525_QD (quad density) from FLOPPY_525_SSDD (single-sided double-density).
As far as I am aware, the Osborne1 only supported SSSD and SSDD disks. Revert appears to resolve known Osborne1 issues [5792](https://mametesters.org/view.php?id=5792) (thanks to @Osso13 for pointing this out) and [8100](https://mametesters.org/view.php?id=8100) @cuavas.
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Drugs: Their Effects on You [Matthew Eric D'Asaro, Firehawke]
New working software list additions (apple2_flop_clcracked.xml)
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Drugs: Their Effects on You (cleanly cracked) [4am, Matthew Eric D'Asaro, Firehawke]
