Yes, I've got one of those as well. With a little effort, BTW, you can adapt the 60-pin expansion connector to a 52-pin header or other adapter and fit that in to a target PGA socket on your target board, thereby giving you in-circuit operation capabilities in spite of the fact that the 68HC11 is operated in expanded multiplexed mode on the EVBU. The 6801L1 is essentially the same sort of thing with less in the way of resources, but much easier to use because it's a single chip. Th 68HC25 will allow you to expand it into a similar system, yet give you back the use of the ports lost in briniging out the data bus and address bus on what would otherwise have been I/O ports. The LILBUG is not as sophisticated as the BUFFALO monitor that's on the EVBU, but it has the debug, line-by-line assembler, etc. functions. There are numerous boards of this sort for a variety of microcontrollers. They seldom address the issues associated with microprocessors, however, since they're normally used to host single-chip mircontontrollers, e.g. 68HC05C8, 87C15x, etc. which are essentially single-chip microcomputers with all their resources INSIDE the chip, where you can't do much to use the internal busses, etc. Few of them actually allow you to bring out the address and data bus and the associated control signals. I'm constrained by NDA from explaining in detail, but, if you spend a little time with a logic analyzer and certain MCU's from a very large MCU manufacturer, perhaps the only one that uses the term MCU, you might learn a little about how this can be done in spite of what the mfg prefers. Dick ----- Original Message ----- From: "Eric Dittman" <dittman(a)dittman.net> To: <classiccmp(a)classiccmp.org> Sent: Thursday, July 19, 2001 12:34 AM Subject: Re: Intro to Microprocessors

Actually, the original title implied that one wanted to learn about microprocessors. I pointed out that learming about micorPROCESSORs, which are hardware devices, was a very different task from learning about microCOMPUTERs, which is essentially a course in programming and operating systems. The suggestion that an evaluation board was a good choice for the former is one with which I have little difficulty. My own preference is for as little dedicated hardware as possible, since, as I've maintained, less is better. The fact is, however, that some knowledge of programming is certainly warranted, since all the microprocessor hardware you want won't solve a problem at all without effectively constructed code. This requires knowledge of microCOMPUTING. While microCOMPUTING requires little knowledge of hardware, microPROCESSORs won't do much without it. I like the idea of using that evaluation board for the 68HC11, but it doesn't offer any more opportunity to learn about the hardware elements, the microPROCESSORs, because all the hardware is already done for you. With the application of that emulator cable that you can attach to the evaluation board, you can learn a fair amount about the hardware in a target system, since the target responds to stimuli provided by the cable. However, it still runs at the rate determined by the evaluation circuit, though it's possible to use a clock however, and I wouldn't recommend that in a residential area unless you want to see the neighbors carrying torches and pitchforks. Dick ----- Original Message ----- From: "Mike Ford" <mikeford(a)socal.rr.com> To: <classiccmp(a)classiccmp.org> Sent: Friday, July 20, 2001 2:22 AM Subject: Re: Intro to Microprocessors person up