Radio Shack TRS-80

?FC ERROR Tandy / Radio Shack TRS-80 ?FC ERROR means Illegal Function Call — you passed an argument outside the valid … ?IO ERROR Tandy / Radio Shack TRS-80 ?IO ERROR on the TRS-80 means an input/output operation to cassette tape or … ?OM ERROR Tandy / Radio Shack TRS-80 ?OM ERROR means Out of Memory — your BASIC program has used all available RAM. … ?OV ERROR Tandy / Radio Shack TRS-80 ?OV ERROR means a numeric calculation produced a result too large for BASIC to … ?SN ERROR Tandy / Radio Shack TRS-80 ?SN ERROR on the TRS-80 means Syntax Error — BASIC could not understand the … ?UF ERROR Tandy / Radio Shack TRS-80 ?UF ERROR means you called a user-defined function (FN) that has not been …