[z-machine] Small contribution to the ZMachine specs

[Johnny Billquist]

Ben Collins-Sussman wrote:
> On 3/26/06, Johnny Billquist <bqt at update.uu.se> wrote:
> 
>>Anyway, the Z-Machine spec is really more complete than given credit for
>>here. This specific question is dealt with in chapter 10.
> 
> Ah!  Thank you!
> 
>>It's a grave mistake to try to write an interpreter from only reading
>>the spec of the opcodes.
> 
> Actually, we've been doing nearly the opposite.  We've read almost the
> entire spec... everything *but*  the opcodes.  We've been writing all
> sorts of subsystems (memory, zscii routines, op decoder, stack
> management, object parsing, dictionary parsing), with the thought that
> the opcodes would be implemented at the very end.
> 
> The only parts of the spec we haven't read yet are the I/O streams and
> the opcodes.  Apologies!

Well, in that case I should apologize as well, for making assumptions 
here. :-)

Fun to see someone else doing this from scratch. Me, I wrote one in 
PDP-11 machine language, just because I wanted one. Not much use of the 
C implementations around. :-)

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol