Saturday, August 26, 2023

Where Electricity Flows, Millimeters Matter

See also Embedded Advisor magazine's Nov 2017 issue's article about Western Design Center starting on page 10, and the subsequent article starting on page 14 that ranks WDC in the top 20 IP and design solution providers. Bill Mensch is on the cover. Nostalgia might be a reason for some to use the 6502; but for me it's not. Even 30 years ago however a Z80 had to run at 4MHz to keep up with a 1MHz 6502; and Jack Crenshaw, an embedded-systems engineer who wrote regularly in Embedded Systems Programming magazine said in the 9/98 issue that he still couldn't figure out why, in BASIC benchmark after benchmark, the 6502 could outperform the Z80 which had more and bigger registers, a seemingly more powerful instruction set, and ran at higher clock rates. The 65816 even outperformed the 68000 and 8086 in the Sieve of Eratosthenes benchmark. 6502 forum posts as well as projects and other things posted on the web showed the need for a 6502 primer, mostly for hardware.

busbar bending machine These are supposedly to make it easier; but you won't be learning the innards or have complete control of every I/O bit with microsecond resolution like you will want for various industrial, workbench, or hobby applications. For any new projects, let me recommend the CMOS version (65c02), not the old original NMOS version. It's not just about power consumption. The CMOS version fixed all the bugs of the NMOS one, added a few nice hardware features, added more instructions and addressing modes, and is available in much higher speeds. I have a comparison here. This primer is to give a good grasp of computer design basics, so that with good construction, you can make a computer that works on first try, with no hardware troubleshooting. Timing diagrams are in the data sheets and will not be repeated here. If you're totally new to digital electronics, the book "Understanding Digital Electronics" by Gene McWhorter appears to be a good a intro. It's old; but most of these basics still apply-it's just that in modern digital electronics, these same building blocks have gotten a lot denser and faster. If you're totally new to electronics in general, the book "Understanding Solid State Electronics" from the Texas Instruments Learning Center is a good introduction, simple, with almost no math. It includes some digital, but not like the "Understanding Digital Electronics" book above. WDC's data sheets use a "B" (for "bar") after the signal name to mean negative logic, as in NMIB in place of NMI. This came from the fact that the equipment they used to write the first data sheets decades ago did not provide for the overbar possibility. There's very little about video here but you can find a lot of material about video on the forum.

I think this is the place for the do you hear sounds that other people don't hear joke. Yes, I do, as my family is half-deaf and we have family joke on how I should share some of my hearing even if how good and how sensitive hearing is are two separate things. I think this post is finished with the exception of one thing which I am not sure if I wish to type. However I feel that my typing finally started flowing well after hours of trying to get this into words and I think it would be unfair from me to say that everything is draining, so I think I should type some of the methods that I discussed with my previous therapist to ease the situation. I must again disclaim that this might only apply to me and not to you (when did I make the reader another aspie or HSP?), and I should probably say that my senses are mostly oversensitive except that my sense of touch defies logic and can either make me feel "hug deprived" and wishing that someone would touch me or send me into panic attack from someone accidentally touching me from behind…

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