MC68EZ328, looking for a schematic  - Page 1
Forum section: electronics / general

author: legacy
author_rank: Super Contributor
timestamp: December 27, 2014, 04:44:14 pm
content: hi guysi have been looking for a schematic to realize a very tiny board made around MC68EZ328i'd like to force the CPU to 8 bit data bus (instead of 16bit) and to add on just a ram, a serial, and an LCDfor this part, the LCD, i have been looking for the prettiest one (which may includes 3.3V to -10V or -21V, DC/DC VEE generator)let me know

author: Rasz
author_rank: Super Contributor
timestamp: December 27, 2014, 11:03:47 pm
content: old Palm III pdas are based on 328if you really want a cheap m68k platform to play around check out old HP JetDirect printservers, they can be had for free-$5256KB dram + 512KB? flash + 68ec000 + standard ethernet chip of that era (AMD something, fully documented)

author: legacy
author_rank: Super Contributor
timestamp: December 27, 2014, 11:24:20 pm
content: yeah, but i'd like to build up a tiny board, something easy with EAGLE/CADi have unsoldered 2 68EZ328, and re soldered them to an adapterthey are the 2 tiny green boardsthe other 2 bigger green boards are 68VZ328also i have bought 3 MC68SEC000and a pretty book

author: legacy
author_rank: Super Contributor
timestamp: December 27, 2014, 11:40:36 pm
content: i have seenthisitem on ebay, HP-J2552-60003-Jetdirect-J2552A-MIO-Print-Server-10BT-10B2-Localtalk, it has 68EC000 on, plus a PLCC flashgood to be known

author: Rasz
author_rank: Super Contributor
timestamp: December 27, 2014, 11:47:41 pm
content: you might also like this one:http://eu.wiley.com/WileyCDA/WileyTitle/productCd-0470380314.htmlhttp://www.sciencelib.net/files/Rafiquzzaman%20-%20Microprocessor%20Theory%20and%20Applications%20with%206800068020%20and%20Pentium%20%20(Wiley,%202008).pdffound it last time I was investigating hp printservers for a hackEdit: Micah did an almost wiredrap dragonball computerhttp://scanlime.org/2011/07/kiwi/https://www.flickr.com/photos/micahdowty/sets/72157627032507669/

author: legacy
author_rank: Super Contributor
timestamp: December 28, 2014, 02:45:34 pm
content: Motorola MC68328ADS is an eval boardit should have:some EPROM or Flash (socket)some SRAM, 512K or sothe PCMCIA interface implemented2 or more serial ports.connector / LCD interface implementedpower supply for LCD bias would be great.size about a credit card or so

author: legacy
author_rank: Super Contributor
timestamp: January 05, 2015, 11:55:37 pm
content: does anyone has a good schematic for a uclinux/328 board or something like the ADS/328 board made by motorola ?

author: Rasz
author_rank: Super Contributor
timestamp: January 06, 2015, 04:06:58 am
content: I already told you about one, Micah kiwihttp://scanlime.org/2011/07/kiwi/http://linux.slashdot.org/comments.pl?sid=7079&cid=856634another onehttp://www.mediumware.net/DragonOne/DragonOne.htmthere was also ez328simm, but its mostly gone from the internethttps://web.archive.org/web/20000829041941/http://www.openhardware.net/ez328simm/best source of resources will be uclinux mailing list around year ~2000edit: and if desperate you can draw one from hires ucsimm pictureshttp://retired.beyondlogic.org/etherip/ucsimm.htm

author: legacy
author_rank: Super Contributor
timestamp: January 06, 2015, 05:37:49 pm
content: Quote from: Rasz on January 06, 2015, 04:06:58 amthis one is very ugly, i have found it googling but it is full of hw bugsalso there is not documentation about the LCD he usedQuote from: Rasz on January 06, 2015, 04:06:58 amexactly, that is the reason why i am posting: in the hope somebody has archived something about these beautiful boardsthe kiwi project is new for me, let me see it

author: legacy
author_rank: Super Contributor
timestamp: January 06, 2015, 05:41:13 pm
content: p.s.don't you know where i could buy an MC68EZ328-sim board like the one in the kiwi blog ?

author: Rasz
author_rank: Super Contributor
timestamp: January 07, 2015, 08:56:03 am
content: thats the original ucsimm, email Micah, she might still have one, sme might even have her kiwi in parts

author: legacy
author_rank: Super Contributor
timestamp: January 08, 2015, 10:34:59 pm
content: does anybody has a VEE -21V generator from 5V ?it should be used with LCD, i'm going to read and check such a circuit

author: legacy
author_rank: Super Contributor
timestamp: August 15, 2015, 07:15:22 pm
content: hi againI moved myself into other projects (debug processor, VHDL for the FPGA side, C for the HOST interface), but I am still looking for a good MC68EZ328 board.I have not enough resources (time) to build one.Any idea ?

author: westfw
author_rank: Super Contributor
timestamp: August 16, 2015, 05:09:50 am
content: QuoteAny particular reason?For instance, Freescale has a bunch of Coldfire "Tower System" development boards that are "current", if you're mostly wanting "something with a 68k instruction set."http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=0152101A026740B1ECDBC0I don't know if there's anything in the "68k that runs unix" space.(man, you know it's a bad sign when a link on the freescale website sends you to motorola.com...)

author: legacy
author_rank: Super Contributor
timestamp: August 23, 2015, 05:27:20 pm
content: Quoteoh well, because it's 3.3V, it's 68000 core, it has a built-in STN LCD controllerI have realized a similar LCD controller in VHDL (job purpose), but .. I do not want to have too many toys around.in short, hobby purpose, nothing serious, simply I like it.

author: legacy
author_rank: Super Contributor
timestamp: August 23, 2015, 05:27:34 pm
content: Hacked PDA, it's based on MC68EZ328I am hacking an old PDA, I am already able to take the control of everything (CPU, flash, LCD, PWM, buttons, … ) but I prefer to find a development board because It looks like a very ugly frankenstein and adding or modifying something is an horror story (e.g. the FLASH has page1 with the protection flag=On, it's impossible to unprotect without supplying +12V, which means …. cutting route in order to provide extra voltage, hacking, etc …. I was so bored that I unsoldered the whole FLASH, soldering back a new one)If I had more free time, I would have built a board from scratch, but ... Eagle/CAD has not all the symbols, I have to design them, and the story looked so boring to be hobby

author: legacy
author_rank: Super Contributor
timestamp: August 23, 2015, 05:30:41 pm
content: I'd like to find one of these boards, ucsimm/328 (aka RT-Control's ucSimm)The uCSimm has been a very popular module ever since one little advertisement in Circuit Cellar. The uCSimm is an embedded Ethernet module ideal for Internet connectivity.MC68EZ328 Motorola Dragonball Microcontroller8 Mb DRAM (4096k x 16 bits)1 Mb (512k x 16 bits) / 2 Mb (1024k x 16 bits) / 4 Mb (2048k x 16 bits) ROMCS8900A LAN Controller, 10baseT Ethernetbuilt in LCD controller, 320x240built in DRAM controller which requires no Glue Logic+3.3 volt