QtSpim is a new user interface for spim built on the Qt UI framework. Moreover, the interface is clean and up-to-date unlike the archaic X windows interface. Spim has moved to SourceForge! The source code for all version of spim are in an SVN repository and compiled version are available for download. There is also a bug tracker and discussion forum.
It reads and executes assembly language programs written for this processor. It omits most floating point comparisons and rounding modes and the memory system page tables. The MIPS architecture has several variants that differ in various ways e. MIPS compilers also generate a number of assembler directives that spim cannot process. These directives usually can be safely ignored. Earlier versions of spim before 7.
This architecture is obsolete though, never surpassed for its simplicity and elegance. This part of the architecture changed over time and was poorly implemented in earlier versions of spim.
This type of code will need to be updated. Examples of new exception handling are in the files: exceptions. It also include a torture test to verify a port to a new machine.
I wrote the original version of spim as the target machine for my first compiler class at University of Wisconsin, Madison in the spring semester As a birthday present, the 8. The newest version of spim is called QtSpim , and unlike all of the other version, it runs on Microsoft Windows, Mac OS X, and Linux—the same source code and the same user interface on all three platforms!
QtSpim is the version of spim that currently being actively maintaned. The other versions are still available, but please stop using them and move to QtSpim. It has a modern user interface, extensive help, and is consistent across all three platforms. QtSpim makes my life far easier, and will likely improve yours and your students' experience as well. Full source code is also available to compile QtSpim , you need Nokia's Qt framework , a very nice cross-platform UI framework that can be downloaded from here.
In more mundane news, you can now reduce the proliferation of duplicate ROM sets for families of similar keyboards and other devices. First of all, the lost unencrypted version of Rafflesia has resurfaced, ending a long saga!
You can find out about all the updates in the whatsnew. Hi everyone! After four busy weeks, MAME 0. Although it was added last month, VS Mahjong Triangle is now working. Are you ready for MAME 0. With dozens of reported issues fixed, over a hundred pull requests merged, and a flurry of development across all areas, our mid-year release is huge! There are lots of new Apple IIgs and Macintosh software list items, tying in nicely with the recently improved emulation of these systems, as well as an update to the Colour Genie collection, and a massive haul of MicroBee floppy dumps.
A few more Mattel Juice Box cartridges have been dumped, allowing you to marvel at the poor-quality, 6 frames-per-second video. Carl has continued to work on Japanese home computers, and Ville Linde is back this month, bringing a batch of updates for the Konami Hornet platform. This release includes preliminary sound support for the Super A'Can console.
There are several general usability improvements in this release, including updated Chinese and Greek translations, better configuration handling for slot devices, and a few small enhancements to the built-in user interface. It also runs at less than 1mhz.
That is just as interesting, frankly. Perhaps you only needed a case that would connect the turbo switch to the motherboard. It was fun to turn it on for games that used timing-loops for frame rendering to make games twice as fast :.
Do I recall correctly that those turbo buttons would, counterintuitively, actually down-clock the CPU? For compatibility with software that had hard-coded timings or something? The correct way to wire them is so that turbo "on" means full speed and turbo "off" means slowed down. Different motherboards implemented it differently. Usually downclocking the FSB or inserting waitstates for memory access.
Turbo on meant a faster machine, and turbo off meant 4. Old software had timing loops and other delay constructs. For a while, that button was meaningful when running games intended for the original clock rates. It was impossible to play and funny to look at because the game was so sped up. All of the NPCs in the game, which normally just stand in place and move their arms about, were moving so fast it was bananas. You could barely see their arms they were like hummingbirds. The game was intended to be on a 7Mhz stock machine pre And it was perfectly timed to that speed.
Same story here. Insane at any two digit clock. Sidebar: Ultima games are great. Did you see Nox Archaist? Wow - that is quite the unabashed Ultima clone right there! The guy put in a good amount of time and delivered an Altima with many modern sensibilities baked in.
I've been playing it on my Apple it's a lot of fun. Great story. I remember those days well, I also remember finding every last byte of UMB, elaborate autoexec. Kids these days don't know how good they got it. You mean how bad they got it? Reading this made me remember that "Turbo button" Games in particular were often rendered unplayable.
To provide some compatibility, the "turbo" button was added. Osiris 42 days ago root parent next [—]. The one I had I believe was a The problem was that it was easy to accidentally bump the button and my Mom would complain the computer was running slow. MichaelMoser 42 days ago root parent next [—]. I once had a system, where the turbo button wasn't doing anything. Don't know if that was by accident, or by design. I remember having the same experience when visiting a friend - misterious Turbo button that apparently?
What you did is basically a burnintest. All manufacturers torture their hardware by locking it in a hot room for several days at max speed to see if it fails.
The basic theory is that if it's able to survive the torture test, then it's less likely to fail once it's been sold to the customer. Parts for things like space missions go through even more severe torture tests, where they're bombarded by radiation and every horrible thing you can imagine and that actually makes the price go up!
QuercusMax 42 days ago root parent prev next [—]. I had a K6 MHz I couldn't get to run reliably in windows without underclocking to But it was rock solid on Linux.
Always wondered why I had an old Pentium 90 that would crash on NT consistently. The diagnosis was a crappy bus that resulted in various errors. Just for fun, I loaded Red Hat 5. The syslog was full of bizzare errors, chattering the whole time too. LargoLasskhyfv 42 days ago root parent prev next [—]. Linux doing the right thing, resulting in a cooler CPU on average when running under Linux.
I remember when I was using Windows 98, the media player [1] I was using is shipping with a tray icon which has a menu item written 'Save power when CPU is idle'[2]. It did exactly that HLT thing. After ticking the menu, CPU just go cold.
A 65c02 bought new today from WDC will comfortably do 20mhz, and 25mhz would probably also be no trouble. Doesn't sound like something one can try at home. AnimalMuppet 42 days ago root parent next [—]. Why not? You can always buy some beer Does anyone know of good write ups or explanations of what makes the so reliable and what competition it had in being chosen for medical applications?
Simpler is an advantage in that world, if you can understand the functioning of your device to the cycle level then you have a much better chance of delivering something that will work reliably. One of the things that I loved about the Apple ][ was that it was possible for one person to completely understand everything about that computer from the hardware to the software.
I've never had that level of complete understanding of any system I've used since. Yep, similar experience here. I taught myself BASIC, assembler, graphics programming and game programming on that machine over a period of about four years of hacking around on it including hand-commenting some significant chunks of the ROM. It started out as a lot of trial and error but, on later reflection, ended up being a surprisingly thorough grounding in computer science from which to launch my career.
That machine was also the last time I really felt like I was aware of everything happening in a computer from interrupts to registers to memory mapping down to the metal.
Yes, that was the beauty of the 8 bit era, and many people lost it without even knowing that they lost something very precious. The total control is a very nice feeling. I'm not sure why "simple, understandable system design" would have to be synonimous with 8-bit computing. One of the most appealing things about new open hardware initiatives is how they bring this simplicity and surveyability together in what's otherwise a very modern design and context.
Seems every time someone applies that to hardware with a wider compute path, other complexity creeps in. Would be interesting to make a 32 bit Apple 2 style computer. Include a ROM for a means to boot, and leave everything else simple, with some nice slots. It was fun and not that hard for me, a newbie to FPGA. One of the bigger challenges is integrating peripherals. I got bogged down trying to do SD Card interfacing.
There are off the shelf bits of IP from Xilinx, etc. I think modern machines started their slide into mind boggling complexity when bus speed and CPU speed outstripped RAM speed. So much complexity and unpredictability is in the all the infrastructure built around cache. Those kinds of things can be done with the CPU, Apple 2 style. New machine based on the C64, nearing production release.
Like these ones? Yes, but perhaps aimed more at retro computing. I have a couple of those. ThrowawayR2 42 days ago root parent prev next [—]. Because once the clock speed gets past a handful of MHz, maintaining good clock distribution and good signal integrity become more painful very, very rapidly. Are there any good sources of documentation for working with Arm chips? Like, a simple single board or breadboard computer?
ThrowawayR2 42 days ago root parent next [—]. It's unclear what you're asking for here? Fair enough. I suppose what I'm asking is whether it's possible to purchase a more modern CPU independently of a SOC and design my own single board computer built around that. Are there data sheets for it? A search of the interned didn't turn up what I was looking for, but I'm very new at hardware work. Perhaps newer chips have such tight timing requirements that you can't work with them without using a SOC?
ThrowawayR2 41 days ago root parent next [—]. Nearly everything is going to be a SOC because that's what commercial applications need to minimize part count and cost; there's negligible demand for a standalone processor.
The busses used to access peripherals and memory are not suitable for off-die use. You may like Project Oberon [1] designed by Niklaus Wirth [2] then. His guiding principle was to make a powerful but simple system that could be understood from top to bottom by a single person, from the RISC hardware to the OS to the compiler used to compile and run the OS.
It's quite a bit above the Apple ][ in terms of power. And there is a ton of developed software ready to go. At the least, all the internal code would be very mature at this point.
I don't have any documentation but I would imagine that as these chips have been in existence for so long, its behaviour is extremely well understood, including most, if not all, of its weak points.
The work around for these weak points should also be well known. I wonder if that makes finding replacements easier too, since you can comfortably find or even make new ones.
Blank black window for the remix. What should I be seeing? I don't have webgl in QubesOS :. Here is a microcontroller with a I just read an article recently about how based chips are used inside of satellite receiver boxes. I wonder if it's just a function of the time. I imagine anything designed new now would use an ARM based microcontroller but likely when many of these systems were originally designed those were much less common and more expensive. I'd expect that there are still a lot of new designs where something like an 8-bit microcontroller such as an AVR makes more sense than using something ARM based.
It's getting harder and harder to find places where this is true. Generally will use less power, too. And that's assuming your unit counts are so high that firmware developer time is free.
This is not strictly true. Many AVR chips can handle more computation than their clockspeed would suggest due to some really nice assembly codes that allow for common DSP calculations. I ended up having to use inlined C instead. AVR32 was neat, but has lost all commercial relevance. Virtual machine definitions can therefore easily be ported to other computers.
VirtualBox has special software that can be installed inside Windows, Linux and Solaris virtual machines to improve performance and make integration much more seamless. Among the features provided by these Guest Additions are mouse pointer integration and arbitrary screen solutions e. Like many other virtualization solutions, for easy data exchange between hosts and guests, VirtualBox allows for declaring certain host directories as "shared folders", which can then be accessed from within virtual machines.
VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while Oracle ensures the product always meets professional quality criteria. VirtualBox Download. Windows macOS Linux Solaris.
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