Altirra 1.5 test 11 is released.Altirra is an Atari 8 bit Emulator on the Windows/DOS platform.Altirra emulates several models of the 8-bit Atari computers. This includes the the 800, 800XL, and 130XE versions. It has a lot of options, and compatibility is decent especially given the emulator's early stages. It also supports some copy protected games properly in emulation.

Altirra 1.5 test 11 Changelog:
# Number of disk drives increased to 8.
# Mounted cartridges and disks are persisted across runs.
# Blitter loads data for first blit as soon as BLITTER_START is hit.
# Implemented PAL artifacting when VBXE is enabled. Note that this can produce different colors due to clamping in RGB space.
# Implemented blitter modes 2-6.
# Implemented blitter zooming.
# Implemented blitter IRQ.
# Implemented overlay horizontal scrolling.
# Implemented hires mode of attribute map.
# Implemented hires portion of xcolor bit (VIDEO_CONTROL bit 1).

JSW VBXE and Mr. Proper look much better now.

Some things about VBXE I still don't know:

# Whether the blitter IRQ can be signaled (IRQ_STATUS bit 0) when disabled (IRQ_CONTROL bit 0). This isn't possible in POKEY, but it looks like it is possible in VBXE and that's the way it's currently implemented.
# How blitter collision detection works. There are two conflicting definitions in the en docs: one says that the upper bits select the relevant bit in the collision mask, the second is in the modes themselves and shows a simple AND operation. They are especially in conflict for HR overlay mode (mode 6), regarding collision mask partitioning.
# When BLT_COLLISION_CODE is cleared.
# Cycles per byte for various blitter modes. Altirra is not cycle exact for blits but I can easily adjust the cycle accounting.
# How vertical scrolling works. VBXE does not have vertical scroll enable bits like ANTIC, so it is unclear when the row counters for the overlay and attribute map are reset.

Download: Altirra 1.5 test 11