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It was never really clear to me if the "Hornet" was a custom design Intel did for HP or if "Hornet" was just the codename for the 80C186EA, a 186 with added pow
by pdw 3y ago
It was never really clear to me if the "Hornet" was a custom design Intel did for HP or if "Hornet" was just the codename for the 80C186EA, a 186 with added powersaving support. Either way those palmtops were quite cool machines.
- rep_lodsb 3y agoFor what it's worth, I've used a HP 200LX to confirm that some undocumented details (found by disassembling microcode) work as expected: REP BOUND only compares against lower bound REP MUL result in AH (byte) or SP (word) REP IMUL result in CH (byte) or BP (word) REP IMUL reg,r/m,i16 first operand ignored, 32 bit result in DX:AX REP IMUL reg,r/m,i8 first op ign., AH=result bit 23..16, AL=bit 7..0 AAM 00H no "divide by zero" exception, AH=FFh, AL unchanged So it's certainly based on the 80186 microcode, as none of these instructions do the same on any other x86 chip.
- bombcar 3y agoThis is perhaps the comment that most aligns with a username I’ve ever seen ;)