Thanks for the info. One of the commenters in the OP mentioned that the reader in MIT Scheme was still buggy/slow in 1998, but I've been having trouble finding

Thanks for the info. One of the commenters in the OP mentioned that the reader in MIT Scheme was still buggy/slow in 1998, but I've been having trouble finding any MIT Scheme releases that are that old. I've never had any trouble with any Scheme reader, but then again I've never used one on pre-1998 hardware!