Model T software compatibility requires 6 additional control codes beyond
what is implemented in VT100.
Agreed it isn't VT100.
If you want to use the integrated "DVI" functionality (maybe VT100 driver
is a bad name) then you need the screen solution to handle the special ESC
codes. See below.
Anyways my idea is to make an "extended VT100 terminal" as a windows /
linux application. It would be a DVI work alike, and disk basic could
drive it correctly. Today, without the extra escape codes, you just can't
display the screen correctly for TEXT and BASIC.
..Steve
; escape code mappings
; ModelT extended Stock VT100
; ------ -------- -----------
; double ESC trap X eliminated in VT100 driver.
; home 0BH [H
; cls 0CH [2J + [H
; lock line 8 T [T
; unlock line 8 U [U
; lock scroll V [V
; unlock scroll W [W
; turn on cursor P [?25h
; turn off cursor Q [?25l
; delete line@cursor M [M
; insert blank line L [L
; erase to EOL K [K
; set reverse char p [7m
; reset reverse char q [0m
; cursor up A [A
; cursor down B [B
; cursor right C [C
; cursor left D [D
; erase to end of page J [J
; set cursor location Y,c,r [<v>;<h>f
; cls E [2J + [H
; cls j [2J + [H
; erase current line I [2K
; vertical tab H [H
On Tue, Jan 19, 2021 at 2:58 PM John R. Hogerhuis <[email protected]> wrote:
>
>
> On Tue, Jan 19, 2021 at 11:44 AM Stephen Adolph <[email protected]>
> wrote:
>
>> I am actually thinking about exactly that, a new VT100 app that
>> implements the custom M100 control codes, and takes serial data.
>> Was thinking to use the VirtualT framework to do it also.
>>
>>
> VT100 is an industry standard so I don't know about M100 control codes. I
> think you had mentioned something about arrow keys being different in the
> current implementation. Which control codes are you referring to? The whole
> set of Model 100 escapes?
>
> Which is fine... that's one way to go and it can be implemented exactly.
> It just isn't VT100.
>
> The other issue is encoding and fonts. HTERM does this mapping on the
> Model T side, which makes it compatible with any shell/terminal. But you
> could also do a mapping to Unicode on the terminal side. Then you could
> use off-the-shelf fonts.
>
> Another way to go would be to render the display completely yourself with
> graphics based on the Model 102 character set. Then you could get very high
> fidelity.
>
> As to VT, it's just a terminal, so you don't need 99% of what VT does. And
> what VT does do that you need, like rendering the display, has to pass
> through the Model T ROM and 8085 emulation. And it's limited to 40x8. Seems
> like it creates more problems than it solves. Just displaying character
> bitmaps to the screen is a simpler task.
>
> -- John.
>
