Revision History The following changes/additions were made in internal build 0.113. The initialization procedure for enabling the FIFOs of the 16550 was changed as per directions from StarTech. The StarTech 16550 is used in many Practical Peripherals modems. This change may correct overrun and hanging problems for other users. User reports indicate that the FIFOs initialization problem may go beyond the StarTech 16550 and thus, solve problems for users of other 16550s. The following changes/additions were made in internal build 0.114. Additions to force enabling of comm ports for VMBs under 2.1GA. Version number was changed to à1.01 The following changes/additions were made in internal build 0.115. The Interrupt Service Routine (ISR) was improved to insure that all pending interrupts of all ports sharing the same IRQ are serviced. The following changes/additions were made in internal build 0.116. Additional changes to decrease the processing time of the Interrupt Service Routine. The following changes/additions were made in internal build 0.117. Additional information added to the boot time banner. Changed the version number to 1.02. The following changes/additions were made in internal build 0.118. Corrected erroneous sending of XON when receive flow control was enabled. Added code to clear the UART's FIFOs during initial file open. The following changes/additions were made in internal build 0.119. Corrected a problem with hardware flow control for DOS processes. This problem showed up most often in windowed DOS programs. Removed code specific to the March, 1993 beta of OS2. Added support for installable and removable communications devices, eg PCMCIA. Some users of VX00 will see improved performance from FOSSIL aware DOS programs. The following changes/additions were made in internal build 0.120. Code added to allow I/O port mapping to DOS sessions. The following changes/additions were made in internal build 0.121. 7/28/93 14:00pm Corrected a problem that would cause the system to hang if an SIO command line error was detected. Additional code added for "hot plugging" of PCMCIA comm ports. Users of PCMCIA comm devices should not remove those devices while a comm program active. Many comm application programs can not cope with the modem being removed. Your system may lock up if you remove a modem while a comm application program is active. Changed the way virtual CTS is handled. In previous versions, the virtual CTS was always on. Under appropriate conditions, the virtual CTS will now be turned off. The following changes/additions were made in internal build 0.122. 8/14/93 14:20 Corrected a problem in the internal (to SIO) shared interrupt chain. This problem would cause the system to lock up when the third device checked in on the same IRQ. Added command line options for PCMCIA. The following changes/additions were made in internal build 0.123. 8/18/93 19:05 Added code to wake sleeping receive threads when a Flush Input command is received. This additional code allows HA/5 Version 3.1 to work with SIO. Changed the version number to 1.10 and released it for downloading. The following changes/additions were made in internal build 0.124. 8/28/93 14:50 Corrected a serious error in SIO. This problem could show up in almost any way. The most common symptom is/was trap 000e and inordinate processor overhead when comm is active. 0.125. 9/09/93 08:15 Changed version number to 1.11 Corrected problem associated with generating a virtual transmit interrupt. This problem was introduced with the released version 1.10. It broke PCBoard, among others. Added DTR/DSR handshaking. It seems that several printers requires this type of handshaking. This addition necessitated the addition of the DOS Setting SIO_Virtual_DTR_is_HS. This new DOS setting is the first SIO setting that should normally be off. When a DOS or Windows session is using DTR/DSR handshaking, this setting should be turned on. The HP laser printers are the only devices that I know of (or ever heard of) that use DTR/DSR hardware handshaking. All modems that I know of use RTS/CTS hardware handshaking. 0.126 09/22/93 Corrected problems that were introduced when the PCMCIA code was added and released in V1.10. These problems caused several DOS and Windows programs to work poorly or not at all. These problems also caused some DOS and Windows comm programs to use inordinate amounts of processor time. Changed the version á1.13. Corrected a problem in the FOSSIL implementation of VX00. Some FOSSIL aware programs that previously did not work under VX00 may now work. 0.127 09/30/93 17:20 Changed version number to 1.15 and released. Added DOS settings to allow for individual mode settings for each DOS session. The DOS Settings SIO_Virtual_RTS_is_HS and SIO_Virtual_DTR_is_HS have been removed. Their function is more completely covered in the new DOS Settings. Optimized code to eliminate unnecessary virtual transmit interrupts. This change should cut down the amount of overhead placed upon the system by DOS and Windows comm programs. Changed the way the DCB is processed so that CTS may be ignored (if instructed by the DCB) even when RTS is a handshake signal. Previously, SIO would force RTS/CTS handshaking if the baud rate is locked in the command line. The forcing of RTS/CTS handshaking has been removed. A flow control problem that showed up on some systems has been corrected. The flow control problem most often showed up at transmission simply stopping. This problem was introduced when the DTR/DSR handshaking was added. Added the "SIO_Share_Access_With_OS/2" DOS setting. Changed version number to 1.20. 0.128 10/17/93 12:30 Nothing yet.