VileRancour wrote:Jo22 wrote:The pictures were taken from a cheap LCD monitor, which claims to be multi standard (PAL/NTSC/SECAM).
I wished I still had my Co […]
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The pictures were taken from a cheap LCD monitor, which claims to be multi standard (PAL/NTSC/SECAM).
I wished I still had my Commodore 1702 monitor, so I could have provided you with higher quality pictures.
Or any other old school monitor with a comb filter..
My setup:
386DX-40 with turbo brake enabled, caches disabled.
Epson Model Q205A ("CGA" card with mono/colour switch)
Philips 15PF4121
Here's a picture of my CGA wanna-be and a dump from that crystal memory.
I hope they're useful. I've tried to capture the resistors as best as I could.
Heh, not that many 386 systems with CGA cards around.
Interesting setup -- and sort of an interesting card... thanks for that character ROM image. Although looking at these bitmaps, I'm not too sure what to make of it. Any chance that this is just a bad dump? 😉
Hey, thanks a lot for your interest! And yeah, my setup isn't the usual one (haven't got a XT yet).. 😁
But sorry about that dump.. I double checked and I'm afraid it's okay. 🙁
I've used a dedicated EPROM reader for that purpose,
because I wasn't sure about the font's exact location in memory.
The chip is an old 2764 by the way (ceramic type, non-CMOS, 70s style),
so there might be a compatibility issue with the reader..
Or maybe that code is intended as some kind of control program for the card itself ?
Would be be interesting to find out! In any case, there was no other graphics card installed.
I wonder where that font came from.. The system BIOS maybe ? Nah, it's just an ordinary AMI BIOS (or not ?).
Maybe that piece of code is also accessible from DOS (debug, nssi) ?
If you provide me with some instructions, I would be happy to dump the chip once more. ^^
În the mean time, I'll keep looking for more information about this card.
So far, I've found a few more photos regarding this card :
http://www.recycledgoods.com/epson-q205a-8-bi … rome-w-rca.html
http://www.ebay.it/itm/231934847764
That eBay auction includes links to additional photos :
http://s26.postimg.org/esywto49l/00_2668.jpg
http://s26.postimg.org/zedolkluh/00_3586.jpg
http://s26.postimg.org/luwufv7vd/01_3589.jpg
http://s26.postimg.org/jcb5f6m55/02_2674.jpg
(I mention these links here in case the auction is no longer listed.)
Edit: I think I can make out some characters! I've highlighted to what I think are numbers and letters.
But it's hard to see, so maybe there's some corruption going on. Maybe another dump will clarify the matter.
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
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