Altirra 2.1 Test 18 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 2.1 Test 18 Changelog:

Here's a version with 1050 Turbo support: It's currently set to use the stock 1050 timing parameters: 20ms/track, 982 cycles/byte, 91 cycles/bit. Gotta say, the load pattern involved here is pretty sketchy. Not only does the loader on that disk image lack a low-speed fallback and fails on all but a small fraction of drives, but it also sends a Read PERCOM Block request in high speed mode. I'm not ware of AUX2 being significant for that command -- it seems like the drive shouldn't allow this as it could cause false positives from other software that simply doesn't initialize the AUX2 byte. Oh, and thanks for the offer of the drive sounds. I think I'm pretty good at this point. The rotation sound could use some love as the swish period is too long, but I think I can deal with that locally.

Download: Altirra 2.1 Test 18
Source: Here