VOGONS

TSENG EVA/480 ET-2000 EGA / NEC GB-1 COLOR GRAPHICS BOARD

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First post, by Predator99

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I think this nice card I got recently deserves its own topic 😉 Its a TSENG EVA/480 ET-2000 EGA card:

The attachment IMG_0333r.jpg is no longer available

It has the same PCB as the NEC GB-1 COLOR GRAPHICS BOARD:
https://arvutimuuseum.ee/th99/v/M-O/52507.htm

Ad taken from here:
http://www.thecomputerarchive.com/Displays/Vi … Card%20BG-I.PDF

The attachment NEC MultiSync Graphics Card BG-I.PDF is no longer available

There a two add-on boards.
One connected to the feature connector providing TV-out. Dont know why the cable is soldered to the connector. As far as I remember it can also be connected via the feature connector without extra cable. Maybe to improve quality.

The attachment IMG_0355r.jpg is no longer available

The other one...dont know yet, its not a memory expansion.
There is a Z80 and a HM6116 CMOS RAM on it.
https://pdf1.alldatasheet.com/datasheet-pdf/v … CHI/HM6116.html
The card seems to work without it.

The attachment IMG_0356r.jpg is no longer available

And without boards:

The attachment IMG_0357r.jpg is no longer available

Pictures in operation later...

Reply 1 of 6, by Predator99

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Newer revision of the card here:
Bought these (retro) hardware today

Composite out looks really nice on 320x200:

The attachment IMG_0716r.jpg is no longer available

But is unusable with 640x350:

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And all is in black and white. Dont know if this is caused by my LCD or if the circuit doesnt support color.

Digital out works as expected.

Reply 2 of 6, by Predator99

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NSSI BIOS dump

[This is not a product of IBM (IBM is a trademark of International Business Machines Corp.)
* Copyright(c)1986 Tseng Laboratories, Inc. 07/28/86 V1.xx*

The attachment EGA ET2000.zip is no longer available

Reply 3 of 6, by root42

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The black and white is probably because of PAL vs NTSC?

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Reply 4 of 6, by VileR

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Predator99 wrote on 2020-08-23, 12:32:
The other one...dont know yet, its not a memory expansion. There is a Z80 and a HM6116 CMOS RAM on it. https://pdf1.alldatasheet […]
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The other one...dont know yet, its not a memory expansion.
There is a Z80 and a HM6116 CMOS RAM on it.
https://pdf1.alldatasheet.com/datasheet-pdf/v … CHI/HM6116.html
The card seems to work without it.

Oi. Came across this by accident, but that Z80 add-on is probably for register compatibility with CGA / Hercules / MDA:

"A $50 optional daughterboard provides emulation of the CGA, HGC, and monochrome adapter." - https://archive.org/details/PC_Tech_Journal_v … de/2up?q=ET2000
And from someone's ebay listing: "the Z80 CMII module ... (Compatibility Module) manages CGA and Hercules compatibility. " - https://www.ebay.com/itm/Vintage-1986-NEC-MUL … U-/133185245469

That's for the non-"480" version of the EVA ET2000, although it still seems to have some pretty interesting features. Any chance you have any of the software or documentation for this thing?

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Reply 6 of 6, by Many Bothans

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A very nice example of the NEC Multisync GB-1 Color Graphics Board just popped up on eBay with the Z80 module and parallel port bracket. What a fascinatingly odd video card...

s-l1600.webp

  • Zenith Z386SX-20, 8MB FPM, Video 7 1024i, Unhoused
  • AOpen AP43, Am5x86-133@160, 1MB L2, 128MB FPM, Stealth III S540 32MB Savage4, SB32
  • ITX-Llama, 3Dfx V3
  • Asus CUV4X-E, P3-933, 512MB PC133, Hercules 3D Prophet II MX 32MB, SB Live!
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