mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-24 07:48:04 +11:00
13 lines
528 B
Plaintext
13 lines
528 B
Plaintext
|
: (spie) DROP ; ( always enabled )
|
||
|
: (spix) ( x -- x, for port B )
|
||
|
0 SWAP ( rx tx ) 8 0 DO
|
||
|
( send bit 7 to bit 6, TR's output bit )
|
||
|
DUP 1 RSHIFT 0x40 AND ( rx tx bits ) 0x80 OR ( CLK hi )
|
||
|
0x3f PC@ OR 0xf3 AND ( TH and TR output )
|
||
|
DUP 0x3f PC! ( rx tx bits )
|
||
|
( CLK low ) 0x7f AND 0x3f PC! ( rx tx )
|
||
|
( shift tx ) 1 LSHIFT ( rx tx<< )
|
||
|
( read into rx ) SWAP 1 LSHIFT 0xdc PC@ ( tx<< rx<< x )
|
||
|
( out bit is the 6th ) 6 RSHIFT 1 AND OR
|
||
|
SWAP LOOP ( rx tx ) DROP ;
|