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Tandy (1000) Video II, Mode E - 640x200x16

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    Originally posted by Cloudschatze View Post
    So, different question. Has anyone ever looked into creating some sort of software routine that would effectively "map" the Tandy's 320x200x16 and 640x200x16 video modes to their EGA counterparts (and then appear as such to supporting software)?
    If you're looking for some sort of TSR to do this -- meaning, allow EGA graphics programs to run transparently on TGA systems -- this is impossible without a 386 to run programs in V86 mode so their memory and port reads/writes can be trapped and massaged.

    The routine has been written before, if you just want to see how to do it. Graeme Devine's Turbo Champions does this; the internal bitmap is created as 160x200 in CGA/TGA's interlaced format and then blown to the screen with REP MOVSW for those modes; for EGA, he wrote a routine that blows the same bitmap into EGA planar memory (at a noticable speed penalty). You'd have to run in DOSBOX's debugging mode to trap/watch it, or try to disassemble it. I might try to disassemble it because I want to see how his scaling routines work (I know how they work by looking at their output, but am curious how he used the registers).
    Offering a bounty for:
    - A working Sanyo MBC-775 or Logabax 1600
    - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)


      That looks fantastic. I just happen to have my tandy 1000 Tl sitting right here. I was always a fan of this video mode but nothing other than deskmate seemed to use it. I believe Gif converter or something named similarily like that (an image display program) support this mode. I used use it for displaying some pretty great looking pics on the tandy 1000tl

      I'm going to try out these titles today on the system. Anymore suggestions. Star trek looks fantasic. I had this on the system as the time but I recall it running much too slow to be playable.

      What I need is a sierra graphics driver to take advantage of this mode. I wonder maybe it already exists for kings quest V.


        Originally posted by digress View Post
        What I need is a sierra graphics driver to take advantage of this mode.
        Sierra never made a 640x200x16 Tandy driver, that I'm aware of. Someone could certainly create one though...

        Such a driver would make the following Sierra SCI1.1 titles "playable" on a stock, TGAII-bearing system (all of which feature PSSJ DAC and "3-voice" music support besides). Per the Wikipedia list:

        1992 Christmas Card
        EcoQuest: The Search for Cetus
        EcoQuest II: Lost Secret of the Rainforest
        Freddy Pharkas: Frontier Pharmacist
        The Island of Dr. Brain
        King's Quest VI: Heir Today, Gone Tomorrow
        Laura Bow: The Dagger of Amon Ra
        Leisure Suit Larry 6: Shape Up or Slip Out! (disk and low-res CD-ROM version)
        Mixed-Up Mother Goose (Version 2.000)
        Pepper's Adventures in Time
        Police Quest: In Pursuit of the Death Angel (enhanced remake)
        Quest for Glory I: So You Want to Be a Hero (256 color remake)
        Quest for Glory III: Wages of War
        Space Quest IV: Roger Wilco and the Time Rippers (CD-ROM version)
        Space Quest V: The Next Mutation


          Wait, Sierra had 3-voice support for games that didn't even support TGA? Seriously? That's great
          Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
          Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Moog Satellite, Oberheim SEM
          "'Legacy code' often differs from its suggested alternative by actually working and scaling." - Bjarne Stroustrup


            Originally posted by commodorejohn View Post
            Wait, Sierra had 3-voice support for games that didn't even support TGA? Seriously? That's great
            Probably for the 1000RLX which has 3-voice/DAC audio (PSSJ chip) + VGA graphics.


              Yeah, Sierra didn't drop Tandy sound support until the introduction of their SCI32 interpreter.

              Several other companies supported Tandy sound separate from the video hardware as well, resulting in a number of EGA/VGA-only games with Tandy sound/music options. Lemmings 2 has a rather remarkable Tandy soundtrack. Well, at least, I think so...



                Originally posted by vwestlife View Post
                Probably for the 1000RLX which has 3-voice/DAC audio (PSSJ chip) + VGA graphics.
                Also, many people upgraded the video on their Tandys to VGA.
                My Retro Computing and Vintage Gaming Blog :


                  With much gratitude to NewRisingSun, I'm pleased to share (with permission) a set of 640x200x16 Tandy drivers he has created for use with select Sierra titles:


                  The archive contains four separate drivers, described as follows:

                  - TGA640C.DRV is for 256-color Sierra games with a *color* mouse pointer (SCI1.1). These games originally shipped with EGA640.DRV and are aware of that configuration, for example, by presenting an all-text introduction (KQ6) or offering to skip the crest cleaning sequence (SQ5).

                  - TGA640M.DRV is for 256-color Sierra games with a *monochrome* mouse pointer (SCI1). These games never shipped with EGA640.DRV, as separate 16-color versions were available, and may behave erratically whenever palette cycling is applied - see SQ1 and LSL5 title screens.

                  The two "A" drivers differ from their counterparts in that the dithering pattern alternates between even and odd lines, giving a checkerboard pattern rather than a striped pattern.

                  To use a driver, simply place it in the game directory, and edit the RESOURCE.CFG file, replacing the existing "videoDrv" entry with the relevant TGA driver name (e.g., videoDrv = TGA640C.DRV).

                  The use of Tandy's CM-11, or a similar monitor of comparable dot-pitch (0.42 or better), is highly recommended.


                    I'm very impressed by this. Does he have a page or post where he explains the development of these?
                    Offering a bounty for:
                    - A working Sanyo MBC-775 or Logabax 1600
                    - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)


                      From the Quest Studios forum :

                      Originally posted by NewRisingSun
                      I have no time for or interest in maintaining a page.
                      The TGA640C.DRV produces the same output as EGA640.DRV in SCI1.1 games. The T640M.DRV looks more impressive, generally, than the Sierra 16-color versions.
                      My Retro Computing and Vintage Gaming Blog :


                        These are, of course, just DOSBox screen captures, but are slightly modified to (sort-of) give an (approximative) idea of the CM-11 output...

                        Freddy Pharkas: Frontier Pharmacist

                        Leisure Suit Larry 5


                          Abo More Screenshots with the special driver please.
                          Last edited by dr.zeissler; December 1, 2015, 10:41 AM.


                            I tried this driver on my tandy 1000 sl but I only get a blank screen. Works in emulator, but doesn't appear to on real hardware.

                            Other 640x200x16 programs work just fine on my system.


                              Did DeskMate s 16 color Mode?
                              Also what about a Windows 3.0 driver?


                                The recently-released game Planet X3 supports Tandy 640x200x16 in an update you can download after purchase.
                                Offering a bounty for:
                                - A working Sanyo MBC-775 or Logabax 1600
                                - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)