AltairBASIC on a Z80

Hello, all: Here's an interesting question for the group. Someone who works with me on the Altair32 Emulator is attempting to get AltairBASIC 4.0 running on a Z80 plug-in. It doesn't run. While scanning some past issues of BYTE, I came across the following letter from May, 1980: "I wonder if any BYTE readers could assist me in locating the patch to Altair 8k 4.0 Version and Altair Extended 4.0 Version BASICs which will allow these BASICs to run on a Z80." "I recently purchased a TDL ZPU which uses the Z80. The manual notes this incompatibility stating that Altair BASIC 'has as part of its routines several occasions where the parity flag is checked as part of the function. In the Z80 the parity flag indicates OVERFLOW during math routines, not parity.' The manual states that it contains a patch in Appendix C, but no Appendix C is included." Does anyone either have this TDL Appendix C or can tell me how to patch BASIC 4.0 to work on a Z80. Thanks. Rich