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Re: Which ROM image of SeaBIOS is the one for the 80386-compatible PCs?

Posted on 2018-06-20, 18:28

in PC Emulation

in PC Emulation

You need a BIOS to match the I/O writes of the chipset/memory/IO logic of the 386 board you are emulating. For example, different BIOSes might handle EMS and other extensions differently because one chipset may do it differently despite following a derivative of the AT architecture similar to how a …

Re: Bought these (retro) hardware today

Posted on 2018-03-11, 20:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Fine, fine, fine by me... but once again, to restate my point, I also just don't see the point whatsoever of people going out of their way to dedicate to their adoration of Slot 1 nowadays; sure, you can remove the cartridges easily compared to pin CPUs, there is less problems with keying, and they …

Re: Bought these (retro) hardware today

Posted on 2018-03-11, 19:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

People here yearn over Slot 1 CPUs and machines? How boring; nothing but computers which have the promise to run modern software but instead play chicken when it comes to anything greater than their era. I get that the cartridge look may be nice, but that's just aesthetic that gives off little …

Re: Maximum amount of memory on a 486

Posted on 2017-12-01, 16:59

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A 486 can address a maximum of 4GB physical memory. Good luck trying to find a chipset and a BIOS that lets you do that though, even if you have the technology to directly solder and wire a ton of sticks.

Re: IBM VGA emulation

Posted on 2017-11-17, 16:57

in PC Emulation

in PC Emulation

PCem-X is horrible, outdated code. Please use 86box instead for reference. It is a successor of this fork.

Re: Processor microcode information

Posted on 2017-10-27, 16:32

in PC Emulation

in PC Emulation

Still would love to delayer the 8086/8088 someday to see what is going on down there with the microcode. Simply decapping it won't help without going further.

Cirrus GD BIOS alternatives

Posted on 2017-09-23, 21:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This question is mainly for VBE. NetBSD's VESA terminal will not work with the current BIOS on my onboard GD-5428 planar. On bootup, it only gives me three video modes to set, and fails to work on all of them. BUT, since I am sure without a doubt that the BIOS chip is flash, I can easily program the …

Re: x86 cycle accurate Paging lookups vs segment descriptor fetching vs faults on accurate CPU emulation?

Posted on 2017-08-08, 20:09

in PC Emulation

in PC Emulation

vladstamate wrote: I even have 2 versions of Intel 8255 because the PCJr one is quite different so rather than cram 2 implementation in 1 single cpp file I have 2 implementations. The PCjr motherboard uses a regular 8255 IC though. Perhaps the pins are hooked up to a different interface?

Re: mWave IO port access writes for Sound Blaster mode?

Posted on 2017-08-05, 19:08

in Marvin \ Sound

in Marvin \ Sound

http://www.adamcon.org/~dmwick/thinkpad/ Hm.... from this page, it looks like the DSP functions can be and are preloaded by the driver when initializing the processor part of the card. I'm not sure whether he means that the Sound Blaster emulation code can be loaded with a simple toggle sequence or …

mWave IO port access writes for Sound Blaster mode?

Posted on 2017-08-05, 03:49

in Marvin \ Sound

in Marvin \ Sound

No kernel drivers for Linux appear to exist for the mWave DSP, which is what I would have expected for IBM's neglect around this era. Unfortunately, the only way to enable Sound Blaster compatibility is to use proprietary DOS/Windows drivers, which sucks for using sound with the Linux kernel. …

Re: SB 2.0 CT1350 CMS chips dumped

Posted on 2017-07-28, 02:38

in Milliways

in Milliways

US based! In the North Carolina area.

Re: SB 2.0 CT1350 CMS chips dumped

Posted on 2017-07-21, 02:21

in Milliways

in Milliways

Anyone have a programmed GAL they can ship? I have a compatible board but no programmer.

Re: Bought these (retro) hardware today

Posted on 2017-05-21, 23:05

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Fully wrapped within the original styrofoam packaging. And yet this was $2, when for eBay, even the wrapped drives come for around $120 without the original box itself. For shame, online markets. You have finally disappointed me. Helllooooo, flea markets and computer scrap centers. https://i.imgur. …

Re: CMS/Gameblaster Rewrite and accuracy

Posted on 2015-12-23, 05:21

in DOSBox Development

in DOSBox Development

OPLx wrote: but unfortunately the hardware that they are used on is clocked different from the Gameblaster Frequency can be adjustable for SAA1099 VGMs like every other VGM. Which means you can adjust an SAA1099 VGM to have the exact frequency of a Game Blaster.

onestop.mid on dbopl with Windows 3.1 GMIDI patches

Posted on 2015-11-06, 20:59

in DOSBox Development

in DOSBox Development

On real hardware, there is a wave noise at the beginning: https://www.youtube.com/watch?v=K2Jxf353FWI On dbopl (default core, no compat or old) with the latest stable release, there is none. I'll try to see if I can record a sample tonight of the dbopl version, as I am on a mobile device right now. …

Re: 8088 MPH and emulation....

Posted on 2015-10-31, 16:07

in PC Emulation

in PC Emulation

https://www.youtube.com/watch?v=-ZASZfOgsnw Poof. The only thing needed to be done on now are the Kefrens and the Credits scenes, which will take some long time to figure out. Also New CGA capture as a bonus.

Re: 8088 MPH and emulation....

Posted on 2015-10-18, 17:00

in PC Emulation

in PC Emulation

Edit: OBattler implemented SALC in the interpreter. Moire now works.. Not ready to push to Git repository yet. Polygon part still doesn't work though, might be an issue with the FDC issue or memory banking if the part can't completely load in memory.

8088 MPH and emulation....

Posted on 2015-10-18, 02:47

in PC Emulation

in PC Emulation

https://i.imgur.com/meJ5xRY.png https://www.youtube.com/watch?v=Vg2n8Fp7F2g Think again! PCem-X, the underrated fork of PCem, (almost) breaks records. The Kefrens, 3D Polygons and the Credits sequences seem to crash all upon loading due to very improper handling. We have long ways to go until this …

Re: CGA Composite Mode under DOSBOX (Commited r3804)

Posted on 2015-10-18, 02:00

in DOSBox Patches

in DOSBox Patches

Oh right, I forgot you could fine tune composite settings with shortcut keys in the DOSBox decoder... I nulled that ability out in my test image rendering program with the decoder implemented and I completely forgot about that until now. DOH! Call me stupid on this one.

Re: Fastest emulators period

Posted on 2015-10-17, 20:32

in Console & Arcade Emulation

in Console & Arcade Emulation

Warajevo does pretty good for Spectrum emulation on a 386SX-33.

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