iwantfoki.blogg.se

1. #Cpu speed accelerator for mac how to
2. #Cpu speed accelerator for mac drivers
3. #Cpu speed accelerator for mac update
4. #Cpu speed accelerator for mac driver
5. #Cpu speed accelerator for mac software

#Cpu speed accelerator for mac driver

Generating the sound samples takes a while and the sound driver has to be careful that it doesn't write into the buffer such that that samples yet to be played are overwritten. The sound driver regenerates the samples in the sound buffer following vblank. Q: What is the "sound QoS" or "sound rate limiter?"Ī: It's a fix for a behavior in the sound driver in the Mac ROM that causes audio glitches when running with an accelerated processor. So this big dump of documentation is my attempt to start down that path.įAQ - Here are some questions which others have asked me privately and figured I'd post a condensed version of their question and my answer. I like designing by myself and with Garrett but we are feeling lonely! It would be good to get some collaborative projects going where the understanding of how they work is distributed among the community rather than just with a few people. I think my design methodology works well and I will teach it to anyone who's interested and has the required prerequisite knowledge. Boards and PAL/GAL images are good to reverse engineer for study and reproduction, but with that approach you don't get get to hear from the designer about the tradeoffs and reasoning.

#Cpu speed accelerator for mac how to

I am of course looking for feedback, but my main aim in posting this documentation is to get some information out there on how to design an accelerator.

#Cpu speed accelerator for mac update

Here's the schematic for the update part of the system: Nevertheless it's totally worth it since the additional cost for the update system is quite low. The data rate is pretty slow, maximum 1 kbit/sec, so it will take several minutes to update the CPLD.

#Cpu speed accelerator for mac software

I am using the inexpensive CH340G USB-to-serial chip to bit-bang the CPLD's JTAG port in order to do a software update. One interesting feature that I have added partway through development is the USB update system. Here's an annotated render of the board showing where the external components are placed: The diagrams are a bit of a work in progress but I believe they all basically make sense.

These are complicated but I'm hoping some of our skilled members can take a look. I have tried my best to specify the behavior of these blocks in my timing diagrams available here: These are the FSB controller, DRAM/ROM controller, I/O bus target (i.e. There are four main blocks in the CPLD shown in the diagram above. Of course, my description above sort of just scratches the surface. The control logic is amenable to implementation in the Lattice LC4128Z/E/C/B/V CPLD too. The current board is using the Xilinx XC95144XL-10TQG100C CPLD to implement the control logic but that's just because we at GW have a few trays of them from a cancelled project. CPU speed is selectable, either 20 MHz or 25 MHz. The accelerator trickles out these writes from the fast CPU to the slower PDS bus while the fast CPU gets to continue executing from RAM or ROM memory on the card. This lets the accelerated CPU write to video/sound memory up to twice in a row with 0 wait states. In order to achieve the requisite 3x speedup on graphics performance, I have implemented a longword posted write buffer. The Macintosh SE ROM is also reproduced on the board in two 512kx8 70ns flash ROMs. The card has 4 MB of legacy 60ns DRAM onboard which can be accessed with 0 wait states at 25 MHz. Therefore I have employed an MC68HC000 running at up to 25 MHz instead of an '030. My aim with this card is to achieve a speedup of 3x or so while maintaining the greatest degree of compatibility with applications. I'm the principal designer and Garrett is the codesigner and he manufactures our boards. As usual with my gizmos, this is a collaboration with Garrett Fellers of Garrett's Workshop.

#Cpu speed accelerator for mac drivers

With up to 6.6M logic cells and offered with transceivers ranging from 6.25Gb/s to 12.5Gb/s, Zynq 7000 devices enable highly differentiated designs for a wide range of embedded applications including multi-camera drivers assistance systems and 4K2K Ultra-HDTV.I wanted to post about my new design for a 25 MHz 68HC000-based Macintosh SE accelerator. Zynq 7000 devices are equipped with dual-core ARM Cortex-A9 processors integrated with 28nm Artix 7 or Kintex™ 7 based programmable logic for excellent performance-per-watt and maximum design flexibility. Available with 6.25Gb/s transceivers and outfitted with commonly used hardened peripherals, the Zynq 7000S delivers cost-optimized system integration ideal for industrial IoT applications such as motor control and embedded vision. Zynq 7000S devices feature a single-core ARM Cortex®-A9 processor mated with 28nm Artix™ 7 based programmable logic, representing a low cost entry point to the scalable Zynq 7000 platform.