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Peter Fidelman 2022-05-28 19:10:57 -07:00
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README.md
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@ -773,7 +773,6 @@ Some machines use memory mapped IO where certain memory addresses are
routed to hardware devices instead of main memory. This machine already routed to hardware devices instead of main memory. This machine already
has the full 64K of memory connected so no address space is readily has the full 64K of memory connected so no address space is readily
available for hardware devices. available for hardware devices.
Instead we define a separate input-output space of 65536 possible Instead we define a separate input-output space of 65536 possible
locations. Each of these possible locations is called an IO locations. Each of these possible locations is called an IO
"[port](https://en.wikipedia.org/wiki/IO_port)". "[port](https://en.wikipedia.org/wiki/IO_port)".
@ -788,7 +787,7 @@ transmitter that sends data to a computer terminal, or just an
output pin controller that is wired to a light bulb. output pin controller that is wired to a light bulb.
This is a fake software CPU so I am going to hook it up to This is a fake software CPU so I am going to hook it up to
stdin and stdout. [stdin and stdout](https://en.wikipedia.org/wiki/Standard_streams).
```rust ```rust
use std::io; use std::io;
@ -821,7 +820,6 @@ a software emulation.
/* Dump CPU status. /* Dump CPU status.
* Like the front panel with the blinking lights that Chuck * Like the front panel with the blinking lights that Chuck
* talked about. */ * talked about. */
println!("{:?} {:?}", x.ip, x.dstack); println!("{:?} {:?}", x.ip, x.dstack);
let _ = io::stdout().flush(); let _ = io::stdout().flush();
} }
@ -830,6 +828,8 @@ a software emulation.
} }
``` ```
That's all the CPU instructions we'll need.
```rust ```rust
]; ];
``` ```
@ -861,7 +861,7 @@ Forth family. If you want to learn how to implement a full featured Forth,
please read please read
[Jonesforth](http://git.annexia.org/?p=jonesforth.git;a=blob;f=jonesforth.S), [Jonesforth](http://git.annexia.org/?p=jonesforth.git;a=blob;f=jonesforth.S),
and Brad Rodriguez' series of articles and Brad Rodriguez' series of articles
["Moving Forth"](http://www.bradrodriguez.com/papers/index.html). "[Moving Forth](http://www.bradrodriguez.com/papers/index.html)".
The small Forth I write below will probably help you understand The small Forth I write below will probably help you understand
those Forths a little better. those Forths a little better.
@ -1068,7 +1068,7 @@ fn build_dictionary(c: &mut Core) {
let mut d = Dict { let mut d = Dict {
dp: 0, /* Nothing in the dictionary yet */ dp: 0, /* Nothing in the dictionary yet */
here: 2, /* Reserve address 0 as an "entry point", i.e. where the here: 2, /* Reserve address 0 as the "reset vector", i.e. where the
CPU will jump to start running Forth. We don't have a CPU will jump to start running Forth. We don't have a
Forth interpreter yet so we'll leave address 0 alone for Forth interpreter yet so we'll leave address 0 alone for
now and start the dictionary at address 2 instead. */ now and start the dictionary at address 2 instead. */
@ -2633,11 +2633,11 @@ Start out in interpreting mode.
d.c.store(state_ptr, 0xffff); d.c.store(state_ptr, 0xffff);
``` ```
```rust Put a call to the outer interpreter at the CPU's
d.c.store(0, quit); [reset vector](https://en.wikipedia.org/wiki/Reset_vector).
```
```rust ```rust
d.c.store(0, quit);
} }
``` ```
@ -2649,7 +2649,7 @@ fn main() {
/* Put the dictionary into memory */ /* Put the dictionary into memory */
build_dictionary(&mut c); build_dictionary(&mut c);
/* Run Forth */ /* Start running the CPU from the reset vector */
c.ip = 0; c.ip = 0;
loop { loop {
c.step(); c.step();
@ -2704,6 +2704,7 @@ There is a shell script supplied that will do all of the above for you.
bash build.sh bash build.sh
``` ```
Please read frustration.4th if you want to learn more about how to Please read
use Forth. [frustration.4th](./frustration.4th)
if you want to learn more about how to use Forth.