Re: Proposed Assembler Commands

On Sat, 30 Apr 2005 22:45:45 +0100, Pooh Bear
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:

>Mike Monett wrote:
>
>> To All,
>>
>> Microprocessors have become so simple that it seems anyone can program
>> them nowadays. But think of what it was like when the first processors
>> came out and you had to program around noisy circuits and unreliable
>> memory.
>
>Rumour has it that the 6800 had an undocumented instruction.
>
>HCF - Halt and Catch Fire
>


It probably didn't work. The 6800 was an n-channel depletion-load
chip. You need CMOS to start a decent blaze.

I think it did have an opcode that would put it into a test mode that
only a reset would fix.

John


.

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