Re: TTL video capture
Posted on 2023-03-17, 12:46
I suspect (but would need to verify) the TTL RGB color lines are high-z terminated just like the syncs. If so, you could just use a simple passive cable splitter
Re: 32-bit 80386DX ISA Single Board Microcomputer
Posted on 2023-03-14, 14:00
looks like a pretty solid design, let's see how it holds up under heavy processing load
Re: How to connect my VGA MS-DOS PC to an LCD? (with extras)
Posted on 2023-03-14, 01:00
320x400 :) VGA fixed this problem by introducing line doubling. For scanline gaps to be visible you need a big CRT with really small dot pitch. People who remember scanlines and are nostalgic for them grew up on consoles/TV connected computers/CGA. Or had really big, nice, and expensive VGA CRTs ;)
Re: What are the best Vga to hdmi scalers or peripherals for MS-DOS games ?
Posted on 2023-03-13, 02:21
it outputs 60Hz and there is no adjustment
Re: How can I manually maximize the upper memory usage of "SYSTEM", under DOS 7 of Windows 98?
Posted on 2023-03-11, 15:10
On PCDOS you can use the DOSDATA=UMB directive to load those structures into upper memory. Perhaps it works on MSDOS as well?
Re: S3 86C805 1024x768 High Color?
Posted on 2023-03-08, 15:43
I got my hands on one of these and answered my own question - NO. The 2MB upgrade on these cards is equally as worthless as on the Cirrus. All it unlocks is more interlaced modes.
Re: Revisiting PC-DOS 7.1.
Posted on 2023-03-07, 03:19
So, does FORMAT32 /S work or no?
Re: Adventures of a generic Turbo XT clone
Posted on 2023-03-05, 23:11
Finally, some people consider the 8-pixel character box of the EGA an advantage, because it allows tiling the screen with the 25%, 50% and 75% dithering characters without vertical bars (as you would get it on VGA cards with their 9-pixel character box). The VGA can easily be switched to an "EGA …
Re: Best video card for Tex Murphy Under a Killing Moon
Posted on 2023-03-05, 22:56
I can say from experience that the ET4000 does just fine in the UAKM video test. Either your ISA bus could be running at a reduced clock or the motherboard could be adding recovery waits
Re: Convert IBM 5175 to connect to standard VGA graphics card without Extron box
Posted on 2023-03-05, 14:44
Hi all, I have an IBM 5175 PGA display. It is a neat little CRT. I've read it was a common mod in the past to convert these to have a standard 15 pin VGA cable. I am having trouble figuring out how this mod would deal with different sync polarities at resolutions other than 640x480. So, I think the …
Re: Modems in a Retro build?
Posted on 2023-03-04, 20:29
spavatch wrote on 2023-03-04, 18:43: maxtherabbit wrote on 2023-03-04, 01:32: Yep. I even bought a line simulator so I can call one computer from the other 😀 Can you elaborate on that? What does such simulator do? Where can I read about it? I literally just did, check the post immediately above …
Re: Modems in a Retro build?
Posted on 2023-03-04, 18:35
Yep. I even bought a line simulator so I can call one computer from the other :) Was it easy to setup? I bought some ATAs a year ago to try this: https://www.youtube.com/watch?v=EGFIEF6siIE But i never did manage to get it working. I might give it another shot though. The dial-up sound is pure …
Re: Modems in a Retro build?
Posted on 2023-03-04, 01:32
Yep. I even bought a line simulator so I can call one computer from the other 😀
Re: Powering a CRT that terminates in male IEC? 15khz from a modern pc?
Posted on 2023-03-03, 15:28
It was the IBM 5151 monochrome display which used the horizontal sync from the video card to drive the deflection and could be damaged by an out of spec input. There has never been a monitor to my knowledge that could destroy itself from simply receiving NO video input, that sounds like utter …
Re: Powering a CRT that terminates in male IEC? 15khz from a modern pc?
Posted on 2023-03-03, 14:47
If it has a 15 pin VGA type connector, it is very unlikely that it is 15kHz Plug in a regular IEC cable to it and plug it into a normal VGA card
Re: Opinion on running windows 95 on a 486DX4 100 with write back
Posted on 2023-02-27, 21:20
Win95 "DMA support" didn't come until Win95 OSR2. And yes, you need both a drive and a controller that support UDMA. https://en.wikipedia.org/wiki/UDMA Getting UDMA to work on a 486 would require that rare unicorn of a PCI controller that is old enough to work with a 486 but new enough to support …
Re: accidentally set etherlink iii boot rom to C0000, is my card useless now ?
Posted on 2023-02-23, 14:32
if you just remove the ROM chip from the socket you should still be able to boot up with the card + a VGA I think
Re: Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)
Posted on 2023-02-20, 03:34
Not a module as such. Just a RTC IC Filename s-l500.jpg File size 63.76 KiB Views 161 views
Re: Strangely limited to 1024x768
Posted on 2023-02-19, 21:45
d3vilsadvocate wrote on 2023-02-19, 21:09: I ordered an EXTRON RGB-HDMI 300 A to see how that works. I can always resell it if I don't like it. that's a fantastic scaler, even if it doesn't solve this specific problem they are super handy to keep around
Re: Newly made 4MB 30pin SIMMs
Posted on 2023-02-19, 21:44
The three chip simms use more address lines than the 9 chip simms to do the same thing. It’s weird, but that’s what the person who makes purple ram told me. And I can confirm my experience on my own motherboard matches this. To get to 32mb I had to use 8 x 9 chip simms That's misleadingly …
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