Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

300 AppendixA
Comparing MPE/iX Systems to MPE V Systems
Software Characteristics
The FDEVICECONTROL Intrinsic
MPE V computers, a limited number of device control functions can be
modified through the FDEVICECONTROL intrinsic. On MPE/iX
computers, FDEVICECONTROL has expanded device control
functionality. Additionally, on MPE/iX computers, the
FDEVICECONTROL intrinsic is supported for devices connected
through a private or public PAD.
Functions No Longer Supported
The following functions supplied by the MPE V ATP/ADCC are not
supported by the MPE/iX ASC software.
ENQ/ACK Protocol
The ENQ/ACK protocol handshake between devices and the HP 3000
MPE V ATP/ADCC is not supplied by the ASC software.
Transmission Speeds of 110, 150 and 600
The speeds 110 bps, 150 bps, and 600 bps are rarely used on the
HP 3000 computer, so the DTC does not support them
:EOF: and :EOD: Commands
The :EOF: and :EOD: commands, which can be used on MPE V
computers, are not supported on MPE/iX computers.
Carriage Control Delays
Some hardcopy devices could not receive data quickly enough,
especially when the carriage of the device had to move back to the
beginning of the next line after each line was printed. MPE V supports
terminal type files that allow extra time for the device to prepare for the
next line of output. It does this by providing extra time for each
carriage return, each linefeed, and the formfeed that the device must
perform. Since these devices are obsolete, Hewlett-Packard does not
provide this feature with new terminal type files and printer type files.
Special Response to a Backspace Character
Some devices require the terminal controller to handle the backspace
character in a specific way. For instance, when backspace is used on a
hardcopy device, a character typed after the backspace will be difficult
to see because it will be typed directly over the previous character.
Some MPE V terminal type files react to a backspace by going to the
next line, so that characters typed after a backspace would appear
under, instead of on top of, previous characters. Since devices that
require this special attention are not supported with the ASC software,
only two responses to the backspace character are supplied. Through