Heath 150-307-3 Chips EGA/VGA

Discussion about old graphics cards, monitors and video related things.

Heath 150-307-3 Chips EGA/VGA

Postby Predator99 » 2019-1-06 @ 18:08

Quick presentation of my Heath P/N 150-307-3 Rev 1.33 and P/N 150-307-2 Rev 1.32 8-bit Video cards before going back to storage...

IMG_0760.JPG

IMG_0763.JPG



After Anonymous Coward made me aware its EGA not VGA I took a closer look at them. I think its quite unusual as other cards with EGA/VGA connectors are VGA but support EGA monitors, like the ET3000 cards. So these ones are different.

Jumper setting for VGA display:
1 open
2 close
3 close
4 open
5 open
6 close

IMG_0750.JPG


BIOS dumps:
HEATH EGA.rar
(29.31 KiB) Downloaded 3 times

IBM EGA COMPATIBLE.*ZENITH Z449 ADVANCED GRAPHICS ADAPTER V1.594
(C)Copyright Sigma Designs, Inc 1985,1986

Some interesting text inside:
Code: Select all
 

WARNING:Emulation HW was ON but may have been blocked.
WARNING:Emulation HW ON & SW installed but NMIs are not happening.
WARNING:Emulation HW ON but SW NOT installed
        NMIs may be turned off.
WARNING:Emulation HW & SW are not consistent.

 Emulation Hardware is not responding.

 
 Color Graphics 
 Hercules Graphics 
 Emulation 
 Screen Timeout is 
Board incompatible with software.
In memory version is different than this version. ON.
 OFF.
 is not active.
 set for  5 minutes.
   Color Graphics Mode not allowed with Color Adapter.
   Monochrome Mode not allowed with Monochrome Adapter.
   Single plane graphics allowed (HALF).

 
   Double plane graphics allowed (FULL).

 
   Monochrome Graphics not allowed on Color Display.

 
   Color Graphics not allowed on Monochrome Display.

 
Coprocessor switch set but coprocessor not responding.
Check coprocessor switch on system board.

 

 Auto Mode  Hard Mode 
Usage is:   action

  Where action can be:
          CGA ON          - Enable  Color Graphics Mode
          CGA OFF         - Disable Color Graphics Mode
          HGC ON          - Enable  Monochrome Graphics Mode
          HGC OFF         - Disable Monochrome Graphics Mode
          HGC HALF        - Enable  Single Plane Monochrome Graphics Mode
          HGC FULL        - Enable  Double Plane Monochrome Graphics Mode
          HGC DIAG        - Disable Monochrome Graphics Mode
          MONO ON         - Enable  Monochrome mode
          MONO OFF        - Disable Monochrome mode
          AUTO ON         - Enable  Color or Monochrome Graphics AutoMode
          AUTO OFF        - Disable Color or Monochrome Graphics AutoMode
          SCRNSAV ON      - Enable  Screen Save feature (5 Min default)
          SCRNSAV OFF     - Disable Screen Save feature
          SCRNSAV ##      - Enable  Screen Save feature (## Min default)
[/i]


They do not support 256 colors, but the 640x480x16 VGA mode, so its possible to run Windows in VGA resolution. Same as for other C&T EGA cards.

Xenon 320x200x16
IMG_0758.JPG
Last edited by Predator99 on 2019-1-06 @ 18:11, edited 1 time in total.
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Re: Heath 150-307-3 Chips EGA/VGA

Postby Predator99 » 2019-1-06 @ 18:10

640x480x16 VGA
IMG_0755.JPG


640x350x16 EGA - same image
IMG_0753.JPG


Z-449
Z-449 (150-0307)
SwitchType: EGA/ZDS 480 Line Mode
Controller:
Output Port(s): 15-pin analog
9-pin TTL
Compatibility: MDA, HGC, CGA, EGA, VGA
Video Memory: 256K only
Max. Video Mode Resolution: 640 x 480 x 16 - ZDS Mode
132-Column Support: No
Switches: See Below

1 2 3 4 Monitor Type
OFF OFF OFF ON 80 Column CGA
OFF ON ON OFF 350 Line EGA
OFF OFF ON OFF MDA / Hercules
OFF ON ON OFF VGA (Mode 12 only through BIOS calls)
ON ON OFF OFF VGA Monochrome (limitation as above)

Switch 5 activates automode feature. This automatically switches between EGA & CGA or MDA & Hercules under software control. As this uses NMI, it is recommended to be turned off unless specifically required.

Switch 6 switches between 9 pin TTL video connector (OFF) and 15 pin Analogue connector (ON).

Device Drivers were available for Microsoft Windows (2.0), Lotus 1-2-3, Autocad, Gem and Pagemaker to utilise ZDS 480 line mode.
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Re: Heath 150-307-3 Chips EGA/VGA

Postby Predator99 » 2019-1-07 @ 19:26

Installed the card in my main 286 and can confirm its 100% EGA with a EGA-to-VGA converter at the end :-)

Some results:

EGA Game (320x200x16): Output 720x400 @ 71Hz (seems to make some upscaling here)
IMG_0765sq.jpg


VGA Mode 12h (set with debug.exe): 640x480 @ 60 Hz
IMG_0771640.jpg


Boot and DOS Display: 640x350 @ 71 Hz
IMG_0772egastart.jpg


Compared to a standard 16-bit VGA card in another 286 PC:
Boot and DOS Display: 720x400 @ 70 Hz
IMG_0774vgastart.jpg



...I agree its a very special card and its unlikely many other people own it... ;-)
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Re: Heath 150-307-3 Chips EGA/VGA

Postby root42 » 2019-1-07 @ 20:02

Love the card! The spare IC pads are funny. What spares would have gone there?
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Re: Heath 150-307-3 Chips EGA/VGA

Postby keropi » 2019-1-07 @ 21:22

Oh! Now I have to find one of these cards! LOL
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Re: Heath 150-307-3 Chips EGA/VGA

Postby Anonymous Coward » 2019-1-08 @ 00:58

I also remember that there were a number of laptops from the late 80s or early 90s that could hook up to a VGA monitor but only supported EGA.
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