First post, by Dimitri
didn't tested yet.
DYI IC only kit with DSUB15 and keystone bracket available.
didn't tested yet.
DYI IC only kit with DSUB15 and keystone bracket available.
what chip do these use? Some realtek with embedded bios/dac?
yes, RTG3105iEH
interesting should make a nice XT vga card 😀
Tested, running:
Now, which is better: this Realtek card, or that Trident one by Sergey Kiselev / Monotech...
With 8-bit ISA graphics, probably the most important feature is CGA compatibility.
So, note to self: find some cards based on RTG3105 and TVGA9000, and run CGA_COMP on them!
Nie tylko, jak widzicie, w tym trudność, że nie zdołacie wejść na moją górę, lecz i w tym, że ja do was cały zejść nie mogę, gdyż schodząc, gubię po drodze to, co miałem donieść.
I have Trident boards and ICs, will do test later, need to solder Trident board.
Damn, it's weird to look at boards that have those soviet era resistors here and there. 😁
Amazing work! (Y)
"640K ought to be enough for anybody." - And i intend to get every last bit out of it even after loading every damn driver!
I love soviet era resistors, they have numbered values printed on them, no color codes.... 😊
I am aroused about any X86 motherboard that has full functional ISA slot. I think i have problem. Not really into that original (Turbo) XT,286,386 and CGA/EGA stuff. So just a DOS nut.
PS. If I upload RAR, it is a 16-bit DOS RAR Version 2.50.
wrote:Now, which is better: this Realtek card, or that Trident one by Sergey Kiselev / Monotech...
With 8-bit ISA graphics, probably the most important feature is CGA compatibility.
So, note to self: find some cards based on RTG3105 and TVGA9000, and run CGA_COMP on them!
Realtek having less pins is better - easier to mount, and takes less space on the PCB ;]
Feature wise they should be pretty similar although there was no better card than Trident 9000 in this price range.
But it doesn't matter at all in the XT and using it in anything better than XT makes no sense (not that it makes whole lot of sense in XT - most 16 bit ISA graphic cards will work in 8 bit slot, and those Trident 9000 cards are readly available and cost like what, 5 Euro at most?).
New items (October/November 2022) -> My Items for Sale
wrote:Realtek having less pins is better - easier to mount, and takes less space on the PCB ;]
Indeed, especially considering that it has integrated ROM BIOS, while Tridents need a separate chip for that.
But there's something wrong with this particular BIOS: it only detects 256 KB of DRAM, while the board has 512 KB.
Nie tylko, jak widzicie, w tym trudność, że nie zdołacie wejść na moją górę, lecz i w tym, że ja do was cały zejść nie mogę, gdyż schodząc, gubię po drodze to, co miałem donieść.
watch second image - it is 256Kb onboard, 2 sockets are empty
Yeah the SuperSlow RTVGA 😁
What does it cost ? 😀
https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board
wrote:I have Trident boards and ICs, will do test later, need to solder Trident board.
With Trident board, don't forget to run the SVM89.EXE utility before, which allows you to enable the CGA compatibility mode:
on the way another ISA8 VGA board - has Chips F82C451 or 82С452 with 256Kb RAM, datasheet says fully IBM CGA/MDA/EGA/VGA compatible.
I don't think any VGA card requires additional utilities to provide CGA/EGA modes. They are just subset of the VGA spec.
wrote:I don't think any VGA card requires additional utilities to provide CGA/EGA modes. They are just subset of the VGA spec.
Generic VGA only offers basic compatibility with CGA modes, far from enough for those interested in playing CGA games.
CGA games, when run on a VGA, tend to exhibit various problems, ranging from wrong pallete to not working at all.
So, when considering a VGA for PC/XT, it's very important to choose one with special CGA compatibility mode - which is chipset-specific, hence the need for additional utilities.
Nie tylko, jak widzicie, w tym trudność, że nie zdołacie wejść na moją górę, lecz i w tym, że ja do was cały zejść nie mogę, gdyż schodząc, gubię po drodze to, co miałem donieść.
another board on the way:
wrote:Now, which is better: this Realtek card, or that Trident one by Sergey Kiselev / Monotech...
With 8-bit ISA graphics, probably the most important feature is CGA compatibility.
So, note to self: find some cards based on RTG3105 and TVGA9000, and run CGA_COMP on them!
So I did some tests...
Unfortunately, I don't have anything with RTG3105, so I used a card with similar Realtek chipset - I doubt there are any differences between them in terms of compatibility.
Tested cards:
Realtek
RTG3103
256 KB RAM
8-bit ISA
CGA/Hercules modes set using VMODE.EXE
Trident
TVGA9000i-1
512 KB RAM
16-bit ISA
CGA/Hercules modes set using SVM.EXE
Both running in a Celeron 266 machine, with a typical CRT SVGA monitor.
CGA compatibility tested using: CGA_COMP 1.26.1, Digger, J-Bird, Round 42
Hercules compatibility tested using: MODETEST.EXE from Pizazz Plus 2.0, Blockout, Spacewar (all using standard 720x348 mode), Tunnels of Armageddon (using non-standard 640x300 mode)
The results... surprisingly similar for both chipsets!
The following problems have been found in both:
* Uniformity and Convergence - monitor goes into power saving mode, well, actually as expected
* Border/Overscan color - there's only 8 colors
* Top-and-bottom dual line cursor - no cursor
* Strikethrough cursor - no cursor
* CGA Snow - doesn't work, of course
* Interlaced video mode - doesn't work, of course
* Display Positioning - sometimes blank screen or loses sync
* Start Address reprogramming - some garbage during scrolling vertically
* Composite - doesn't work, of course
Also, both cards have the "Load game"/"Warm boot" feature in their utility programs, supposed to reboot in CGA mode, for running "booter" games - but it failed, both cards reboot in VGA mode, I suspect the machine may be too modern and performs cold boot instead of warm boot.
I've found some differences between the two cards, most of them totally unimportant:
* Vertical retrace - Realtek 59.6 Hz, Trident 60.3 Hz, so both pretty much CGA compatible
* different results of Video RAM Speed Benchmark - expected, of course
* different set of supported SVGA modes - expected, of course
* Realtek always boots in color, Trident - sometimes in color, sometimes in monochrome, ie. the well-known issue with DDC monitors, easily remedied with SMONITOR.EXE or some hardware workaround, and very likely resolved in all those modern cards
The only important difference was with Tunnels of Armageddon running in Hercules mode:
* Realtek - monitor loses sync
* Trident - OK
So, Trident wins.
By a very narrow margin.
Nie tylko, jak widzicie, w tym trudność, że nie zdołacie wejść na moją górę, lecz i w tym, że ja do was cały zejść nie mogę, gdyż schodząc, gubię po drodze to, co miałem donieść.
I wonder if there are 16-bit or VLB kits too, i'd love to make one
lo-fi fingers...