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- From: dwilliam@jabba.ess.harris.com (Dave Williams)
- Subject: Re: Miniboard or Motorola eval board?
- Message-ID: <Bx9JGp.464@jabba.ess.harris.com>
- Organization: Harris Corporation - ISD
- References: <CSTROCKB.92Nov2194659@csws6.cs.sunysb.edu> <1992Nov3.135508.2766@news.media.mit.edu> <1992Nov4.133417.8689@reed.edu>
- Date: Thu, 5 Nov 1992 21:53:13 GMT
- Lines: 73
-
- In <1992Nov4.133417.8689@reed.edu> reeder@reed.edu (P. Douglas Reeder) writes:
-
- >In article <1992Nov3.135508.2766@news.media.mit.edu> fredm@media.mit.edu (Fred G Martin) writes:
- >:Reasons you would not choose the Mini Board:
- >:
- >:* There is no prototyping area on the MB. I believe the EVB has some
-
- >There are no protoyping areas on the EVB. (Unless they've changed the
- >design since I got mine.) Note that the EVB is intended to simulate
- >an HC11 with replaceable ROM, to help one design HC11-using devices.
- >It thus is not really designed to be used in a non-prototype system.
-
- Just a note here - the EVB board is an earlier, more feature-laden
- board as compared to the later EVBU board that Mot. will sell you these
- days for $68.11. (I have one of both.) The EVB board is intended to
- act like an ICE (in circuit emulator) for a 6811 operating in single-chip
- mode. It includes a PRU (port replacement unit) that gives you back
- the three (two?) ports used up for the bus interface. The board has
- a ROM for the buffalo monitor and two ROM/RAM sockets. (Mine came
- with an 8K SRAM in one of the sockets, and nothing in the other.) There
- are two serial ports, one from a UART, and one from the 6811 itself.
- (The 6811 serial port is fixed at 9600 baud under buffalo, the other
- port is jumper-selectable for baud rate.)
-
- The EVBU (EVBU stands for EValuation Board, University style, by the
- way) is a much less complex board. It does not include any RAM
- or ROM (other than what is in the 6811 itself), or a UART. It does
- include a prototype area, however, where you can build custom hardware.
- Mot. supplies a program for PCs called PCBug11 that operates via the
- bootstrap mode of the 6811. What happens, is you power everything up,
- and PCBug11 loads a "talker" program into the 6811. This program is
- used to modify the 6811's internal registers and memory under control
- of the PC. What you have here is a replacement for the buffalo monitor.
- You start up PCBug11, and download your program into the internal
- memory, then use the PC as a debug monitor. Simple, no? I was a TA
- at Clemson University for a whole class of students using EVBU's to
- build various robot stuff. On the whole, I'd say it worked pretty
- well, if you got a working board. (It seems like EVBUs either work
- fine, or or dead out of the box. Maybe Clemson hit a bad run of
- boards or something.)
-
- >Functionally, the HC11 is always in single-chip operating mode, so
- >hardware not part of the EVB cannot be in the memory map. This means
- >you are forever limited to the two 8K blocks of RAM (though you could
- >replace the 8K ROM with one of your own).
-
- Hummm. I wouldn't say that - There's quite a few holes in the
- EVB memory map where you could put all sorts of nifty stuff.
-
- >A furthur point is that the EVB monitor takes up 182 bytes of the
- >zero-page RAM.
-
- If you use the PCBug11 software to drive the EVB board, you get
- away from that. (Of course, the PCBug11 software still chews up
- some memory, but you can use EEPROM memory for that)
-
- I've never had a problem with the buffalo monitor chewing up
- the zero-page RAM. Especially with that nice 8K RAM sitting out
- there. My normal routine is to burn my programs into an 8K EEPROM
- plugged into the 2nd RAM socket, and run them out of that critter.
-
- Hummm. This "note" turns out to have been longer than I intended.
- Oh well.
-
- Dave Williams | I'm lucky if I can
- dwilliam@jabba.ess.harris.com | even spell opinion,
- "Huh? What? Could you repeat the question?" | much less have them.
-
-
- --
- Dave Williams | I'm lucky if I can
- dwilliam@jabba.ess.harris.com | even spell opinion,
- "Huh? What? Could you repeat the question?" | much less have them.
-