Update of ILper v2.3, ILDosLink v1.05, ILVideo v1.35 and ILVideo80 v1.25

[Christoph Giesselink]

Just a small update of ILPer to 2.3, ILDosLink, ILVideo and ILVideo80 available at http://hp.giesselink.com/hpil.htm.

The main change is, that a device as active talker now checks if the incoming data frame is equal to the last send data frame. If not, immediately an ETE frame is send instead of the regular ETO frame at the end. So the controller has the possibilty to detect transmission errors.

Be aware that the HP41 don't recognize all ETE ended transfers as error. Further the emulators Emu71/DOS and Emu71/Win until v1.09 working as controller don't recognize any ETE ended transfers either.

During this work, another issue with a device as active talker was recognized. In prior versions the active talker replaced the incoming data frame by a new data frame without preserving the SRQ bit. This has been fixed also.

ILPer, ILDosLink, ILVideo and ILVideo80 got these fixes.

To quit discussions about the AID 46 and the ID$ "DISPLAY\r\n" for the generic printer in ILPer, the printer AID now can also be changed in the registry/settings file like the ID$. The AID value is not restricted by software, so you should know what you do changing this number!

Just a short history:

The AID 46 with the ID$ "DISPLAY\r" was used in the latest JFG VB ILPer version 1.35. The current ILPer version still use this ID combination. You may recognize that AID 46 (no real device has this ID?) is a ID reserved for printers but the ID$ tells something different beeing a display device.

The AID was changed in VB ILPer v1.33, before in 1.31 it was 48, which is the AID of a HP-82163A, a display device and so we have the ID$ remainder "DISPLAY\r".