collapseos/blk/076

STACK OVERFLOW PROTECTION: To avoid having to check for stack
underflow after each pop operation (which can end up being
prohibitive in terms of costs), PS_ADDR should be set to
at least 6 bytes before its actual limit. 6 bytes because we
seldom have words requiring more than 3 items from the stack.
Then, at each "exit" call we check for stack underflow.
Copy boot.z80 to blkfs 2020-04-23 11:19:12 +10:00			`STACK OVERFLOW PROTECTION: To avoid having to check for stack`
			`underflow after each pop operation (which can end up being`
Replace INITIAL_SP with PS_ADDR conf Now I struggle to remember why I ever did things they way I did. There must have been a reason... 2020-05-12 11:08:24 +10:00			`prohibitive in terms of costs), PS_ADDR should be set to`
			`at least 6 bytes before its actual limit. 6 bytes because we`
			`seldom have words requiring more than 3 items from the stack.`
			`Then, at each "exit" call we check for stack underflow.`