VOGONS


First post, by spark2k06

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After getting ideas from here and there, I have started the development of a double project consisting of an 8-bit graphics card based on the IC RTG3105iEH and in PC/104 socket, which makes it compatible with the new one NuXT v2.0 and on the other it is also with the other project I have gotten into, a converter to ISA 8/16 bits from this type of socket with MonochromeVGA incorporated:

For the development of the Realtek graphics card, I had no choice but to do buy on eBay and carry out a reverse engineering process, in the absence of datasheet information or public schemes. They are still in the routing review phase and final connector positioning adjustments ...

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Reply 2 of 8, by digger

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Interesting. So why will NUXT v2.0 have a PC/104 slot/socket for graphics cards as opposed to an extra standard 8-bit ISA slot? Is it perhaps because 8-bit compatible VGA cards with PC/104 interfaces are still being manufactured and sold due to demand for industrial/embedded systems?

Reply 3 of 8, by Jo22

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Cool! 😎 The green acrylic I/O shield is one thing that impresses me the most.

Edit: I've seen a similar design in on older 286 systems a few times, mainly industrial ones.
If memory serves me well, then the daughter card was a VGA compatible design based on the Paradise chipsets.

digger wrote on 2020-03-21, 13:17:

Interesting. So why will NUXT v2.0 have a PC/104 slot/socket for graphics cards as opposed to an extra standard 8-bit ISA slot? Is it perhaps because 8-bit compatible VGA cards with PC/104 interfaces are still being manufactured and sold due to demand for industrial/embedded systems?

Good question. What makes me wonder is, why homebrew projects rarely seem to support these pin holes found on older ISA cards.
You know, these which are located near the edge connector. These would allow to piggy-back some daughter cards.

640px-EISA_Ethernet_NIC.JPG
Source: https://commons.wikimedia.org/wiki/File:EISA_ … thernet_NIC.JPG

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Reply 4 of 8, by spark2k06

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PC104 8/16 bits SVGA to ISA BUS + #MonochromeVGA, a low cost prototype in times of coronavirus. Definitive position of external connectors, the switches will be totally hidden with some piece of plastic. Now rerouting...

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https://twitter.com/spark2k06/status/1254004466711433221

Reply 6 of 8, by pentiumspeed

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Yes there was one of PC which was Dell 486 with cache and had Tnesg ET4000 on daughter board connected to those pin connectors at that location.

Cheers,

Great Northern aka Canada.

Reply 7 of 8, by spark2k06

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The monochrome module works well. Conversion from PC104 to ISA should be tested with a PC104 SVGA board, coming soon...

https://t.co/vs1wcOPCOf

https://twitter.com/spark2k06/status/12655967 … 9744855041?s=20