id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
88	Document FIRST_TTY_BUF_PAGEX, dn355 DCWs, and IO page tables	Eric Swenson	Eric Swenson	"In debugging ibm 3227 support in the emulator, a lot of time was wasted not understanding what the value of FIRST_TTY_BUF_PAGEX (dn355_data.incl.pl1) represented, what the value of tty_buf.absorig was used for, and how dn355 (and others) use DCWs passed through mailboxes and interpreted not by the IOM but by the FNP.  

It would be good to add some comments in dn355_data.incl.pl1 to document FIRST_TTY_BUF_PAGEX and in tty_buf.cds to document tty_buf.absorig.  In the logic that uses tty_buf.absorig in computing addresses for DCWs passed through mailboxes to the FNP, some documentation would be helpful."	defect	new	minor		Documentation	MR12.6f