Thanks to Dave Williams for providing the Altair community with an image
of his Altair 8K BASIC 2.0 paper tape!

8K BASIC ver 2.0 supports an 88-SIO (rev 0 or 1) as the console serial port
and the 88-ACR cassette interface. The 88-2SIO serial board is not supported.

Version 2.0 can be loaded using the instructions in Appendix A (pdf page 51)
of the 1975 Altair BASIC manual:

https://deramp.com/downloads/altair/software/manuals/BASIC%20Manual%2075.pdf

Instead of toggling in a bootloader, you can also load the bootstrap .hex
file for 8K BASIC 3.0 to load version 2.0 (LDR8K30.HEX for SIO console or
for cassette).

One of the main differences between version 2.0 and version 3.0 and newer is
a 2:1 performance increase due to improvements to the floating point code.
See the Q&A section of the August "Computer Notes":

https://altairclone.com/downloads/computer_notes/1975_01_03.pdf