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7390cb18ed
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7390cb18ed | ||
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58e88119ec |
@ -40,12 +40,14 @@
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;
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( read one char into input buffer and returns whether we
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should continue, that is, whether newline was not met. )
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should continue, that is, whether CR was not met. )
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: (rdlnc) ( -- f )
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( buffer overflow? same as if we typed a newline )
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IN> @ IN) @ = IF 0x0a ELSE KEY THEN ( c )
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( del? same as backspace )
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DUP 0x7f = IF DROP 0x8 THEN
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( lf? same as cr )
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DUP 0x0a = IF DROP 0xd THEN
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( echo back )
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DUP EMIT ( c )
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( bacspace? handle and exit )
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@ -57,17 +59,17 @@
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our string )
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IN> @ ! 1 IN> +! ( c )
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( if newline, replace with zero to indicate EOL )
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DUP 0xa = IF DROP 0 THEN
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DUP 0xd = IF DROP 0 THEN
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;
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( Read one line in input buffer and make IN> point to it )
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: (rdln)
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( Should we prompt? if we're executing a word, FLAGS bit
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0, then we shouldn't. )
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FLAGS @ 0x1 AND NOT IF LF '>' EMIT SPC THEN
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FLAGS @ 0x1 AND NOT IF '>' EMIT SPC THEN
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(infl)
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BEGIN (rdlnc) NOT UNTIL
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IN( @ IN> !
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LF IN( @ IN> !
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;
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( And finally, implement a replacement for the (c<) routine )
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@ -39,11 +39,11 @@ device I use in this recipe.
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### Gathering parts
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* A "classic" RC2014 with Serial I/O
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* [Forth's stage 2 binary][stage2]
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* [romwrite][romwrite] and its specified dependencies
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* [GNU screen][screen]
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* A FTDI-to-TTL cable to connect to the Serial I/O module of the RC2014
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* (Optional) RC2014's Digital I/O module
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* A FTDI-to-TTL cable to connect to the Serial I/O module
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### Configure your build
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@ -85,6 +85,13 @@ In my case (arduino uno), it's `/dev/ttyACM0`. Then:
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See romwrite's README for details about these commands.
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Note that this method is slow and clunky, but before long, you won't be using
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it anymore. Writing to an EEPROM is much easier and faster from a RC2014
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running Collapse OS, so once you have that first Collapse OS ROM, you'll be
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much better equipped for further toying around (unless, of course, you already
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had tools to write to EEPROM. In which case, you'll be ignoring this section
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altogether).
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### Running
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Put the AT28 in the ROM module, don't forget to set the A14 jumper high, then
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@ -94,19 +101,18 @@ identify the tty bound to it (in my case, `/dev/ttyUSB0`). Then:
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screen /dev/ttyUSB0 115200
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Press the reset button on the RC2014 to have Forth begin its bootstrap process.
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Note that it has to build more than half of itself from source. It takes a
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while (TODO: indicate how many minutes).
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Note that it has to build more than half of itself from source. It takes about
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30 seconds to complete.
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Once bootstrapping is done, you'll get a and you should see the Collapse OS
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prompt. That's a full Forth interpreter. You can have fun right now.
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Once bootstrapping is done you should see the Collapse OS prompt. That's a full
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Forth interpreter. You can have fun right now.
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However, that multi-minutes boot is kinda annoying. Moreover, that bootstrap
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code being in source form takes precious space from our 8K ROM. We already have
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our compiled dictionary in memory. All we need to have a instant-booting Forth
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is to combine our stage1 with our compiled dict in memory, after some
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relinking.
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However, that long boot time is kinda annoying. Moreover, that bootstrap code
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being in source form takes precious space from our 8K ROM. We already have our
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compiled dictionary in memory. All we need to have a instant-booting Forth is
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to combine our stage1 with our compiled dict in memory, after some relinking.
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TODO: write this.
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TODO: write this, do this.
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[rc2014]: https://rc2014.co.uk
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[romwrite]: https://github.com/hsoft/romwrite
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@ -1,57 +0,0 @@
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.equ RAMSTART 0x8000
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.equ RAMEND 0xffff
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.equ ACIA_CTL 0x80 ; Control and status. RS off.
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.equ ACIA_IO 0x81 ; Transmit. RS on.
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.equ DIGIT_IO 0x00 ; digital I/O's port
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jp init
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; interrupt hook
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.fill 0x38-$
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jp aciaInt
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.inc "err.h"
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.inc "ascii.h"
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.inc "core.asm"
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.inc "str.asm"
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.equ ACIA_RAMSTART RAMSTART
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.inc "acia.asm"
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.equ STDIO_RAMSTART ACIA_RAMEND
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.equ STDIO_GETC aciaGetC
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.equ STDIO_PUTC aciaPutC
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.inc "stdio.asm"
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; *** BASIC ***
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; RAM space used in different routines for short term processing.
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.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
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.equ SCRATCHPAD STDIO_RAMEND
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.inc "lib/util.asm"
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.inc "lib/ari.asm"
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.inc "lib/parse.asm"
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.inc "lib/fmt.asm"
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.equ EXPR_PARSE parseLiteralOrVar
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.inc "lib/expr.asm"
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.inc "basic/util.asm"
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.inc "basic/parse.asm"
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.inc "basic/tok.asm"
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.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
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.inc "basic/var.asm"
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.equ BUF_RAMSTART VAR_RAMEND
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.inc "basic/buf.asm"
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.equ BAS_RAMSTART BUF_RAMEND
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.inc "basic/main.asm"
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init:
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di
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; setup stack
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ld sp, RAMEND
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im 1
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call aciaInit
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ei
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call basInit
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jp basStart
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@ -1,7 +1,7 @@
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: INIT
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ACIA$
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(c<$)
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." Collapse OS" LF
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." Collapse OS" CR LF
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( 0c == CINPTR )
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['] (c<) 0x0c RAM+ !
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;
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