3 ms·> An invalid register is used with an otherwise valid opcode (e.g., MOY CS,AX). MOV CS, AXby peterfirefly 3y ago> An invalid register is used with an otherwise valid opcode (e.g., MOY CS,AX). MOV CS, AXrep_lodsb 3y agoThat paragraph looks like bad OCR copied from some PDF - it also has the letter 'O' replacing the digit '0' in all the hex numbers.kens 3y agoYes, I cut-and-pasted that paragraph from the 286 manual and clearly I shouldn't have trusted the OCR :-)