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recipes/rc2014: stage2 WIP

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Virgil Dupras 2020-04-08 09:13:46 -04:00
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recipes/rc2014/README.md
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@ -236,7 +236,46 @@ But how do we know that it really works? Because we can write in ROM!
:30 205b 2049 4e54 4552 [ INTER
:38 5052 4554 2031 2046 PRET 1 F
TODO: continue
We're now ready for a re-bootstrap. Here's what we're gonna do:
1. Bring `CURRENT` and `HERE` back to `0x98f`.
2. Set `CINPTR` to `icore`'s `(c<)`.
`(c<)` word is the main input of the interpreter. Right now, your `(c<)` comes
from the `readln` unit, which makes the main `INTERPRET` loop wait for your
keystrokes before interpreting your words.
But this can be changed. At the moment where we change `CINPTR`, the interpret
loop will start reading from it, so we'll lose control. That is why we must
prepare things carefully before that. We'll re-gain control at the end of the
bootstrap source, in `run.fs`, where `(c<)` is set to `readln`'s `(c<)`
`(c<)` word is the main input of the interpreter. Right now, your `(c<)` comes
from the `readln` unit, which makes the main `INTERPRET` loop wait for your
keystrokes before interpreting your words.
But this can be changed. At the moment where we change `CINPTR`, the interpret
loop will start reading from it, so we'll lose control. That is why we must
prepare things carefully before that. We'll re-gain control at the end of the
bootstrap source, in `run.fs`, where `(c<)` is set to `readln`'s `(c<)`.
At this moment, `icore`'s `(c<)` is shadowed by `readln`, but at the moment
`CURRENT` changes, it will be accessible again. However, this all has to change
in one shot, so we need to prepare a compiled word for it if we don't want to
lose access to our interpret loop in the middle of our operation.
> : KAWABUNGA!
( 60 == (c<) pointer )
0x9a0 0x60 RAM+ !
0x98f CURRENT !
0x98f HERE !
( 0c == CINPTR )
(find) (c<) DROP 0x0c RAM+ !
;
Ready? Set? KAWABUNGA!
TODO: make this work...
[rc2014]: https://rc2014.co.uk
[romwrite]: https://github.com/hsoft/romwrite