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Re: WD90C11 and AT&T Model 6300 video mode

Posted on 2021-12-03, 20:19

I've also got an "Olivetti" labled PVGA1 card (related to WD90C00) with Olivetti BIOS.. Maybe this will be useful later on ? Can you try setting mode 40h via int 10h on that card? I have a PVGA1A card in my 286-based AT&T (Olivetti) system and it works with 640x400x2 mode inits. I disassembled the …

Re: Art of CGA

Posted on 2021-08-01, 01:51

by MobyGamer

in Marvin \ Video

That's excellent work. What program(s) did you use to create it?

Re: CVX-2 : covox adapter

Posted on 2020-12-28, 19:28

by MobyGamer

in Marvin \ Sound

Remember that issue I had where the lack of a pull-up resistor meant the OPL3LPT device didn't work right on some of my systems? Do you think it might be related to this? Also, the PS/2 Model 77 is microchannel; some software might not work correctly on it vs. regular ISA, EISA, VLB, or PCI systems. …

Re: Possible Solution to Youtube and DOS Aspect Ratio Issues

Posted on 2020-12-20, 17:18

by MobyGamer

in Milliways

1600x1200 is both a 5:6 integer resize and also preserves the aspect ratio, so that's correct for 320x200 sources. But why does one of your videos have 1182 and not 1200?

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-12-12, 04:58

by MobyGamer

in Marvin \ Sound

Is the number of buffers tunable? (for lower latency, and I think you know where I'm going with this) I agree that there are rapidly diminishing returns when your channels exceed the number of bits in your PCM output.

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-12-10, 15:30

by MobyGamer

in Marvin \ Sound

I very much look forward to your explanation, in your own words. Also, a description of how you deal with high mixing demand (ie. what happens as farther buffers get exhausted: Raising the volume threshold of a channel to be heard, stopping mixing into the current buffer if it needs to be played …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-15, 17:21

by MobyGamer

in Marvin \ Sound

Probably big thing, but... Is there possibility to add support for XMS memory in addition to EMS ? I know that XT can't use XMS, but for 286 this will be useful (when there is no EMS driver available, you can't use EMM386, and UMB_EMS4 is too slow) This is possible, but there's a speed penalty. …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-14, 15:09

by MobyGamer

in Marvin \ Sound

If there is any way to add more keyboard controls to some dialogs, like on/off for 16-bit mixing and/or EMS usage, that would be cool and require less people to use a mouse when testing. But if the code isn't set up for it, no need to worry about it.

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Posted on 2020-10-09, 16:48

by MobyGamer

in Marvin \ Sound

This is very fast and in Dosbox the tracker on my modern PC now runs absolutely smooth from about 1200 cycles. Honestly, it should run fine at 300 cycles. The music playback routine should be running completely in the background, then it doesn't matter how slowly you update the screen. I'll try to …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-09, 04:31

by MobyGamer

in Marvin \ Sound

That doesn't seem like a viable tradeoff. You'd gain up to 24dB dynamic range but you'd introduce harmonic distortion (unless I'm missing something, there's no realtime way to brickwall filter on sub-Pentium systems). Dithering going from 16-bit to 8-bit isn't a win unless you can noise shape the …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-08, 14:40

by MobyGamer

in Marvin \ Sound

FreddyV wrote on 2020-10-08, 08:21: We can move a Jumper on the Tandy TL to bypass the amplifier and transform the input to a Line Out. The documentation suggests that on a TL/2, this is only for the microphone input, to change to a line input. The TL/3 does have a second jumper to affect output, …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-08, 14:30

by MobyGamer

in Marvin \ Sound

If you want to make a video showing off the Tandy DAC, the following games have Tandy DAC support but *not* sound blaster support, making their digital sound unique to the Tandy DAC: OutRun [a1] (1989)(SEGA Enterprises Ltd.) [Racing - Driving].zip Wings of Fury (1989)(Brøderbund Software, Inc.) [ …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-08, 01:34

by MobyGamer

in Marvin \ Sound

I wondered about the 2K buffer thing, because when I was looking at the docs I couldn't see that as a limit. The BIOS extensions for the DAC don't have that limit either, so glad that we were both mistaken on that. But it is a shame it does IRQ only at the end of a buffer, so we have to resort to SB …

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-10-05, 15:32

by MobyGamer

in Marvin \ Sound

Tandy DAC was released a year before Sound Blaster, so even more of a shame. I'm delighted that your TL/2 (an 8MHz 286) could run modmxt all the way up to 48 KHz.

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Posted on 2020-09-27, 20:30

by MobyGamer

in Marvin \ Sound

Thank you for bringing this to my attention. I was unsure about it and had a look at the timing code of SWAG (sourceware archive group). The code used 1Ch.. I have adapted my code accordingly. Timing.clock_tick := Timing.clock_tick+round(Timer.Frequency / 18.2065); Don't do complex math inside a …

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Posted on 2020-09-25, 04:11

by MobyGamer

in Marvin \ Sound

ripsaw8080 wrote on 2020-09-24, 03:26: IMO, a better approach is for the new IRQ 0 handler to finish by jumping to the BIOS IRQ 0 handler (i.e. chain to it) at the usual ~18.2 Hz rate That's what I implied but did not write explicitly. Yes, chain to the original INT08 at the correct interval and …

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Posted on 2020-09-24, 00:25

by MobyGamer

in Marvin \ Sound

I implemented the timing by hooking interrupt 1Ch. Sorry, small grumble from me: timer IRQ is int 8, and then (from int 8 handler) call int 1Ch. If you're changing the PIT firing rate for IRQ0/INT 08h, then you should hook INT 08h, not 1Ch. INT 1Ch is meant for user programs to hook at a guaranteed …

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Posted on 2020-09-23, 05:13

by MobyGamer

in Marvin \ Sound

The $G- switch is set (avoid 80286 instructions). Besides that I have the possibility to choose 8087/80287 or emulation for numeric processing. So far the setting is emulation. Maybe I should change it for Matze's NEC V20, since he has an 8087 installed? For maximum compatibility, you should have …

Re: How can I connect the 4-pin PC speaker post on the mobo to a Line In connector of some audio device?

Posted on 2020-08-08, 22:29

by MobyGamer

in Marvin \ Sound

I forgot to mention that I did finally make a video about this: https://youtu.be/wi2tW23qb9c It's not 100% exhaustive, but I did cover a lot of different scenarios.

Re: GLX Player the only XT player ? Check Mod Master...

Posted on 2020-05-28, 21:16

by MobyGamer

in Marvin \ Sound

I had debate with some peoples in facebook group, and even in my association with Amiga Fan telling that putting an SB16 or GUS in an XT is not normal. "Normal" needs more definition. Putting a Sound Blaster/2.0 in an XT is perfectly normal. They are 8-bit ISA cards, after all. Putting an SB16 or a …

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Re: WD90C11 and AT&T Model 6300 video mode

Re: Art of CGA

Re: CVX-2 : covox adapter

Re: Possible Solution to Youtube and DOS Aspect Ratio Issues

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: GLX Player the only XT player ? Check Mod Master...

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Re: TNDY Tracker - Tracker Music with SN76489 - Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devic

Re: How can I connect the 4-pin PC speaker post on the mobo to a Line In connector of some audio device?

Re: GLX Player the only XT player ? Check Mod Master...