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Re: Best CGA & Hercules monochrome games

Posted on 2023-10-17, 08:48

Anyway, here's my CRT-shaded output on the left, and VileR's example on the right: [image] Sure, there's more bloom in the right example (and it's great, btw), but for me personally that's way too bright. Probably I'd prefer something in-between as a set-and-forget sweet-spot setting. Ultimately, I …

Re: Best CGA & Hercules monochrome games

Posted on 2023-10-16, 21:46

Sure, NP. The Moby screenshot already has interpolation applied, so it's not a good input, but I just took a new one in DOSBox. This one doesn't have the curvature/vignette effects, which might be obtrusive. prince_000_mono-herc-amberSHARP2.png Yeah, ffmpeg is primarily for video, but it can do most …

Re: Best CGA & Hercules monochrome games

Posted on 2023-10-16, 19:18

A real Hercules monitor certainly shouldn't blend to the same degree that the 86box patch does, at least not if it's in good repair. In the Gobliiins post , the second image ('with patch') has absolutely solid colors, but the photo off the monitor shows very clear vertical pinstripes. If you don't …

Re: CGA MC6845 phantom Half vsync?

Posted on 2023-10-15, 12:21

in PC Emulation
Well, that's a relief because it's literally a one line fix. My favorite sort of fix. :) Nice! EDIT: Are any of you guys working on a blog post about the Lake effect? Because it's screaming for one, and I think I am well positioned to write one with some cool visualizations, but if we are going to …

Re: CGA MC6845 phantom Half vsync?

Posted on 2023-10-14, 22:54

in PC Emulation
The screenshot seems to at least strongly suggest a non-'phantom' vsync, since the beginning and the end of the blanking period are neatly lined up vertically; both seem to occur at the last character of the scanline period, which is what you see with a normally-scheduled vsync. A phantom vsync …

Re: CGA MC6845 phantom Half vsync?

Posted on 2023-10-14, 21:02

in PC Emulation
Thanks for the heads-up about this (and a big hats-off for the whole bus-sniffing and visualization setup)! Here's my hunch about what's going on: the answer probably lies in how the 6845 counts those 16 scanlines. A vsync pulse always seems to start and end 8 hdots before a new scanline begins, …

Re: Amdek Color 500 monitor info?

Posted on 2023-10-04, 12:56

"TTL" on this monitor should be digital RGBI with NTSC-like timings, so that input could be used with CGA, PCjr, Tandy 1000, EGA (set for 200-line operation), Commodore 128 and the likes. At the time this was referred to as "direct-drive" or "IBM-type" RGB. Of course, on CGA/PCjr and some Tandys you …

Re: Software for the IBM PC Light Pen?

Posted on 2023-09-06, 07:50

in PC Emulation
^ Interesting... nice to know! I'm positive that I encountered an obscure free/shareware/PD game from the early 1980s which had the option for light pen input; it was a simple game that ran in text mode - a "row swap" puzzle thing IIRC. I know that doesn't help much, but I'm out of town and won't be …

Re: PCEM Hercules

Posted on 2023-08-07, 15:45

in PC Emulation
I can't see any additional brightness levels there... PCem was probably showing true 1-bit Hercules video, or at least I assume so. But the screenshots show 'in-between' levels where there should be sharp boundaries, and XnView reports somewhat more than 2 unique colors: herc1.png herc2.png It's …

Re: PCEM Hercules

Posted on 2023-08-06, 19:27

in PC Emulation
Last time I checked, PCem didn't magically expand the HGC's capabilities to support more brightness levels than just "pixel on/pixel off"... is this some shader? Or just a really good Hercules card? 😀

Re: MartyPC

Posted on 2023-07-31, 19:38

in PC Emulation
That's not quite what it did, it ticked the device without ticking the CPU. It was pretty specifically built for debugging the end credits of area 5150. It might be back at some point, but my CGA optimizations broke it. Alright, then consider my wrong impression of what it did to be a feature …

Re: MartyPC

Posted on 2023-07-30, 06:58

in PC Emulation
Will the "device control" debug tool be back in some fashion? Looking through the commits tells me it was considered unstable and hidden behind a 'devtools' build config option. As I seem to recall, it allowed you to step through execution in multiples of PIT/CGA/etc ticks... at least I assumed …

Re: A very early CGA card?

Posted on 2023-07-18, 07:47

Yeah, it's hard to tell based on the date codes alone - they probably mixed-and-matched components from whatever batches they had lying around (U33 is the character ROM). Mid-'82 sounds about right, and my card also has that '8212' text on the back, but the narrow XT-type bracket must have come …

Re: A very early CGA card?

Posted on 2023-07-17, 20:29

I have one like that. Same P/N, wiring job, and resistor count/values at the composite output stage (one less resistor than other known 'early-type' CGA boards... although I don't think there's much of a difference in the output). However mine has the later, narrower XT-type bracket: 1804464-front+ …

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