* The hopper is hooked up because an input for it appears in the I/O
test, however both the Payout and Ticket buttons seem to use the
ticker dispenser to pay out credits.
-machine/sc16is741.cpp: Implemented CTS/RTS deasserted interrupt.
-bus/spectrum/musicmachine.cpp: Get device out of global namespace,
and some cleanup.
-lnux4004.xml: Include Linux distro in software item description.
* VFD is not emulated, but all other features are present.
-machine/sc16is741.cpp: Emulated basic SC16IS741A UART functionality in
SPI interface mode.
-macine/spi_sdcard.cpp: Improved interface logic:
* Start in unprotected mode as specified by the standard.
* Ignore stop bits in unprotected mode - apparenty real cards do this.
* Set protected or unprotected mode in response to CMD59.
* Reset SPI logic when initially selected.
-machine/spi_psram.cpp: Started adding PSRAM QPI functionality.
-emu/diserial.cpp: Got rid of the per-instance parity lookup table.
New working systems
-------------------
Dmitry Grinberg Linux/4004
New working software list items (lnux4004.xml)
----------------------------------------------
uMIPS Linux 4.4.292+
