It gets even better. With some of the FGPAs you can not only drop in 7400 type gates etc. but also drop in an 8051 micro-controller with FLASH memory.
An aside: I had a sore throat last week that turned into a head cold that had me not wanting to do anything but read a novel. Do something that wasn't designed to earn money. Instead I did something odd. In RAD Studio Delphi I'm simulating an NEC uPD78C10 micro-processor. This is an 8 bit of the CISC rather than RISC variety with all sorts of hardware features. Decades back I wrote a monitor program and an RTOS for it. A friend/employee wrote a cross assembler in C and a Tiny Pascal Interpreter in assembler. First step was to rebuild the cross assembler using RAD Studio C since the old one wouldn't run on the newer WIN-7 64 bit architecture. Then run the assembler on the monitor program so I could get a LST file with opcodes and linkage information. I've got most of the 197 instructions done. And many of those use all sorts of different register modes (somewhat like a Z-80) so many of them reference 8 different registers. The Delphi code I'd done isn't really efficient. More to be readable. But I am curious how long say a 10,000 iteration loop will take. And although I haven't looked at it for decades it was pre-emptive round robin multi-tasking. A Pascal program could be programmed into EPROM with the appropriate header information to be linked into the RTOS on power up and after that it would run as a task. And just like reading a novel, for absolutely no reason other than to do it. End of aside: John > -----Original Message----- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: June-24-18 7:44 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Raspberry Pi PREEMPT-RT --> Scheduling and > message passing in general > > Maybe we've gone full circle. I just bought an $11 part on eBay. I it is > a CPLD. Like an FPGA but smaller and much less expensive and easier to > use. The programming software has a mode where yu can call up a library > of old 74LSxxx parts and drop them on a canvas and draw lies between pins. > They have other functional blocks too, just see of them have the old 7400 > numbers. I did something silly wired a bunch some LEDs to a 4-bit > counters and watch in count in binary. The 7400 series versions "Hello > World" but now I can do that with just one chip. The little CLPD can > simulate maybe 100 7400 type chips and they can be clocked at 50MHz > > SO it is the one chip solution that you wanted but the old SSI based > solution that engineer wanted t build. > > My use for it was counting encoder pluses up to about 1MHz. but I found I > could do that with a microcontroler for 1/3rd the cost and size. > > > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
