mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-25 17:08:07 +11:00
35 lines
698 B
Forth
35 lines
698 B
Forth
( Addressed devices.
|
|
|
|
Abstractions to read and write to devices that allow addressed
|
|
access. At all times, we have one active "fetch" device and
|
|
one active "store" device, A@ and A!.
|
|
|
|
Those words have the same signature as C@ and C!, and in fact,
|
|
initially default to proxy of those words.
|
|
)
|
|
|
|
: ADEVMEM+ 0x55 RAM+ @ + ;
|
|
: A@* 0 ADEVMEM+ ;
|
|
: A!* 2 ADEVMEM+ ;
|
|
|
|
: ADEV$
|
|
H@ 0x55 RAM+ !
|
|
4 ALLOT
|
|
['] C@ A@* !
|
|
['] C! A!* !
|
|
;
|
|
|
|
: A@ A@* @ EXECUTE ;
|
|
: A! A!* @ EXECUTE ;
|
|
|
|
( Same as MOVE, but with A@ and A! )
|
|
( src dst u -- )
|
|
: AMOVE
|
|
( u ) 0 DO
|
|
SWAP DUP I + A@ ( dst src x )
|
|
ROT SWAP OVER I + ( src dst x dst )
|
|
A! ( src dst )
|
|
LOOP
|
|
2DROP
|
|
;
|