Altirra v2.00 test 21

bugs fixed:

• HLE: Screen setup now matches the display list and playfield addressing of the stock OS ROM.
  
• HLE: Fixed cartridge handling so that cartridges are run after disk boot completes.
  
• HLE: Added known RTS instruction at $E4C0.
  HLE:
• CIO now allows SPECIAL commands to be issued on a closed IOCB.

Altirra v2.00 test 20

• Yes, if you fiddle with things just right you can still end up with a 5200 with no cart plugged in. Not too concerned about that at the moment.
  
• Fixed a number of bugs in the disk explorer, added ability to browse actively mounted disks, and also added .ARC support (because no one uses ARC anymore on a real OS)

Altirra v2.00 test 19

• Disk: Fixed incorrect serial transfer rates for XF551 high speed Put/Write and Write PERCOM commands.

Altirra v2.00 test 18:

• DMACTL/HSCROL timing problem. This should fix it.

Altirra v2.00 test 17:

• Test-16 fixed a bug where MaxFlash cartridges weren´t flashing properly. That was a regression from when I added SIC! cartridge support.
  
• No, you´re not supposed to be able to select SECAM in 5200 mode. I´ve blocked that now. This version also contains a fix for a regression where horizontal scrolling broke in a specific case (HSCROL writes early in a scanline).