For those using Tera Term on a PC as a terminal to their Altair: I've found that sending the .tap images of the BASIC interpreter to the Altair is much more reliable when I increase the Transmit delay (in Serial Port setup) to 300 msec/line. If you've been having problems getting BASIC to load without checksum errors, try playing around with the character and line delay parameters. Of course I wouldn't have to do this if Grant sent me the ACR board and tapes!
Tom Lake