29 Dec
2005
29 Dec
'05
1:32 p.m.
Tony Duell wrote:
[1] Note for the uninitiated. The IBM serial card has 2
odd features that
were not present in most, if not all, clones. The first is that it can
pull pin B8 (IIRS) low during I/O reads, needed if the card is used in
slot 8 of the IBM PC/XT. The second is that it has a current loop
interface as well as RS232 .
Does any of the newer serial cards have the current loop option?
Was it only TTY's that used the current loop?