🚀 go-pugleaf

John T. Grieggs writes:
>............................ Incidentally, VT-52 emulation is built into
>the OS ROM, which makes it relatively easy to add VT-100...

If life was that simple! UniTerm uses 3 functions of the VT52 emulator
(or rather the corresponding VDI-Escape):

                  - character output without attributes (+invers)
                  - absolute cursor postion (gotoxy)
                  - bell

Not even the VT52 emulation in UniTerm uses the built-in VT52! There are
a number of reasons for this, but just consider double width/height
characters: after you receive the escape sequence to turn a line into
DW/DH characters you have to convert the line with ALL ATTRIBUTES to
DW/DH this means you have to have a copy of the current screen contents
in character form somewhere, this naturally implies that you have to
decode the escape sequences yourself! There are at least another 2 pages
worth of reasons why you can't use the TOS-VT52 emulation, but I think
this example was enough!


                        Simon Poole
                        K538915@CZHRZU1A.BITNET