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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:

IMG_0333r.jpg

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

NEC MultiSync Graphics Card BG-I.PDF

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.

IMG_0355r.jpg

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.

IMG_0356r.jpg

And without boards:

IMG_0357r.jpg

Pictures in operation later...

Reply 1 of 5, by Predator99

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

Composite out looks really nice on 320x200:

IMG_0716r.jpg

But is unusable with 640x350:

IMG_0714r.jpg

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 5, 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*

EGA ET2000.zip

Reply 3 of 5, by root42

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

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80486DX@33 MHz, 16 MiB RAM, Tseng ET4000 1 MiB, SnarkBarker & GUSar Lite, PC MIDI Card+X2+SC55+MT32, OSSC

Reply 4 of 5, 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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