Re: MP3 player on a 386/387?
Posted on 2021-01-14, 03:16
MP3 decoding doesn't necessarily have to use the FPU, it's possible to use only fixed-point arithmetic.
Re: Pixel Perfect 1280 x 1000 resolution?
Posted on 2021-01-13, 23:23
Lemmings uses a resolution of 640x350, not 320x200.
Re: First game with lan support?
Posted on 2021-01-10, 22:07
Re: scaling 320x200 to 1600x1200 on a 1920x1200 display with hq3x
Posted on 2021-01-10, 02:26
cjfp wrote on 2021-01-10, 00:49: My guess is the problem got fixed in 0.74-2 by the changes represented by the following line in the changelog: More likely to be commit 4095, "Allow 15/16/32 bpp inputs to the opengl output".
Re: Dallas DS12887 longevity
Posted on 2021-01-09, 19:01
But if I get it cofrectly they're designed in an utterly stupid way that they can not be powered from outside - ie through a powered on motherboard - so when the built-in battery fails they render the motherboard unworkable Generally, no - they just forget their settings. What usually happens is …
Re: Dallas DS12887 longevity
Posted on 2021-01-09, 12:59
There's a register in the nvram that controls whether the internal oscillator runs. It ships from the factory with it disabled to preserve the battery. It is possible to disable it via software, which will prevent the unit from keeping time but prolong the battery life during long-term storage.
Re: IPX Access from Image
Posted on 2021-01-06, 13:40
But if their aim is to use native IPX (which is likely, since barely anything DOS related used TCP/IP) this isn't going to help at all. It's a solution for a non-existent problem; TCP/IP is already easily available using serial hardware emulation.
Re: IPX Access from Image
Posted on 2021-01-06, 12:49
The advantage of libslirp is that it does not need promiscuous mode, which is the most common problem with pcap. The disadvantage is that it only works with TCP/IP, so you would have to encapsulate IPX or NetBios traffic. And it is best for client-server traffic, not peer-to-peer due to the network …
Re: IPX Access from Image
Posted on 2021-01-06, 08:30
There is no network hardware emulation in regular DOSBox, IPX is emulated using only a software interrupt handler (which relies on DOSBox shell having control over memory allocation) so once you boot into another OS it's gone.
Re: Orpheus Soundcard: a new DOS soundcard with SPDIF/OPL3/MPU support
Posted on 2021-01-04, 12:42
I'm still not sure where DPMI will fit in. What Windows is doing with hardware for DOS programs has nothing to do with DPMI and only to do with hardware virtualisation done by the variety of drivers, DPMI itself is only a software interface for memory management primarly with few things to allow …
Re: Orpheus Soundcard: a new DOS soundcard with SPDIF/OPL3/MPU support
Posted on 2021-01-04, 06:58
A DPMI host is allowed to run protected-mode DPMI clients in ring 3 (which is exactly what windows did). That means it has full control over all memory mappings and hardware access, not the client.
Re: Orpheus Soundcard: a new DOS soundcard with SPDIF/OPL3/MPU support
Posted on 2021-01-04, 05:11
I think getting PCI cards working 100% in DOS is more of a software problem... Someone just needs to make a decent DPMI host, which windows already proved was possible.
Re: What retro activity did you get up to today?
Posted on 2021-01-04, 05:06
Compared to mpe's benchmarks on 430FX I can see that P100 performs on the Supermicro somewhere between P75 and P90! And it only gives a slight edge over AMD 5x86 and only in some cases. No wonder these board weren't too popular! Right now it feels a bit like a 486 board with a Pentium Overdrive ( …
Re: Dosbox dropping pressed keys?
Posted on 2021-01-03, 19:48
That patch does NOT fix the issue with SDL because grabinfo->grab is NULL when the events that trigger the bug are sent.
Re: Dosbox dropping pressed keys?
Posted on 2021-01-03, 17:36
I am looking for confirmation of the behaviour of the problem. Telling people to upgrade other packages (or patch and rebuild their own Xorg!) is not a practical solution.
Re: Is it possible to deactivate Dosbox's own internal mouse driver emulation and use a TSR instead?
Posted on 2021-01-03, 17:32
The existing "mouse driver" is basically just a stub put there by the emulated BIOS, loading any other mouse driver will replace it. But having said that I haven't seen any of the behaviour with windows 3.1 that you describe.
Re: Dosbox dropping pressed keys?
Posted on 2021-01-03, 16:45
You're out of luck. I suspect you are using an older version 1.20.4 that doesn't include this commit . But I'm not 100% sure if it's this fix, I don't remember. This was generally the case with the initial versions 1.20.x. It has long been fixed. Earlier in this thread there was a conversation …
Re: Terminator 2029 installer reboot
Posted on 2021-01-03, 13:13
For older CPUs it's not really a traditional instruction cache with multiple lines, but rather a very small queue that only holds the next few opcodes. Any jump or branch flushes it. Modifying code immediately before it gets executed without an intermediate jump or branch is usually an attempt at …
Re: Dosbox dropping pressed keys?
Posted on 2021-01-03, 12:49
Looking into this and I just want to confirm that what I'm seeing matches what others are experiencing: - Switch DOSBox (running under X11) to fullscreen - Start a game, hold and press any key - Press and release any other key (while still holding the first) - 1.5 seconds later, if no other keys …
Re: Terminator 2029 installer reboot
Posted on 2021-01-03, 03:01
It's not using unknown instructions. It overwrites the memory that it's running from, relying on the CPU's cache to still hold the original contents.
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