What works:
* HP85A machine with 16K of RAM
* Capricorn CPU works
* Keyboard works (with minor issues)
* CRT text / graphics modes work (correct speed is not emulated yet so service ROM complaints)
* BASIC is usable
What is missing (and I'll have hopefully working soon):
* HW timers
* Beeper
* Integral printer
* DC100 cassette drive
* Extension ROMs
* I/O modules (especially the HPIB interface so that we can hook up floppy drives)
* Other models in the family (e.g. HP86)
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Tetris (v341R) [Arzeno Fabrice, MetalliC]
not sure if its really clone, might be different game which uses gfx and music same as pktet346 set
* Added flip screen & coin counter support;
* Rewritten text layer to tilemap;
* Added notes on top and promoted game with MACHINE_IS_INCOMPLETE, having many bugs that are actually from very sloppy coding;
* improved initiator transfer information logic
* split transfer count/counter
* added rudimentary 53c90a/53c94 support
* reworked initiator transfer information state machine: should now support all scsi phases
* improved handling of dma/non-dma commands
* added an undocumented hack to make InterPro work
* match updated 5390 device
* inherit memory map
* z80scc: basic wait/dma request implementation
* z80scc: renamed WRDY to WREQ to match datasheet, minor touch-up
* Add save state support
* Remove NVRAM - it's unlikely a dynamic PMOS RAM would be battery-backed
* Hook up the rest of the inputs (operator adjustments)
* React to input changes on test line
* Split ROM and RAM port address spaces
* Split RAM memory and status address spaces (no more read/modify/write)
* Fixed bug in FIN handling
* Exposed cycle callback
* Implemented most of intelc440 front panel
* Added preliminary internal artwork for intlc440
* Re-implmented flicker I/O based on how hardware actually works
* Corrected flicker RAM size
* Hooked up flicker playfield lamp outputs - this really needs PWM
