ajenner

9 ms·

61.
by ajenner 12y ago
There are emulators (for other targets) which do emulate NTSC decoding properly, but until I did the research for this demo nobody understood how the CGA card generates composite signals well enough to be emulate it properly. I have some co
62.
by ajenner 12y ago
The emulator I was mostly using for development (DOSBox) doesn't actually crash itself, but here's a nice example of how it goes wrong. In the final part of 8088MPH there is an instruction that modifies the instruction after it, b
63.
by ajenner 12y ago
It depends on how much conventional RAM you have after DOS is loaded, but if you're only missing the last few kB it should be fine (we targeted 640kB but it tops out at about 507kB).
64.
by ajenner 12y ago
It certainly can be (and has been) used for games where a limited set of sprites are drawn - each frame of animation is just a separate compiled sprite routine. Compiled sprite routines write at video memory addresses relative to a specifie
65.
by ajenner 12y ago
Actually reload has been replaced by LRA for x86/x86_64 in GCC 4.8 and work is ongoing to bring LRA to other targets. So it shouldn't be forever.
66.
Eigenmorality(scottaaronson.com)
12 points by ajenner 12y ago|1 comments
67.
by ajenner 14y ago
Wow, so Google penalizes a site if a link to that site shows up in spammy pages? That seems like a new business model for black-hat SEOers: "hey, nice site you have there - it'd be a shame if links to it started appearing all over my spammy
68.
P-adic arithmetic makes division easy(scientopia.org)
2 points by ajenner 14y ago|0 comments
69.
by ajenner 14y ago
As well as the problems mentioned in other comments, this idea suffers from a massive "analog hole" just as with audio. If you can print an object, it would be extremely easy to sample the pulses sent to the stepper motors and run a "virtua
70.
by ajenner 15y ago
That was my first thought too, and I made up serial and parallel cables. But without a keyboard or disk drives, there's no way to bootstrap it into running some software that will talk to the serial or parallel port.
71.
by ajenner 15y ago
That would be great! My email address is andrew@reenigne.org.
72.
by ajenner 15y ago
Different scancodes and different protocol - there's plans for a microcontroller-based adapter at http://www.vintage-computer.com/vcforum/showthread.php?15907... .
73.
by ajenner 15y ago
These machines are so old they don't even have a real time clock, let alone any CMOS RAM on the motherboard. You change the BIOS settings by flipping physical switches, and DOS would prompt you to set the time and date on every boot! This p
74.
by ajenner 15y ago
Heh, I used to do that with all the binaries I could find in an attempt to learn their secrets (before I discovered I could do it with DEBUG.COM). I found that doing "copy command.com /b con" would show me more since it would stop on EOF ch
75.
by ajenner 15y ago
A little update - I've now replaced the power supply's circuit board with one from a modern (and working) ATX PSU, the graphics card with a CGA card (which works with the TV with the BIOS timings) and booted into ROM BASIC using a little Wi