[Coco] Re: 68B09P - Datasheet?

[Frank Pittel]

Never cared much for pics. You may want to consider using a micro-controller
such as the 68hc11 or 68hc12. The core processor is very similar to the 6809
and the chips have built in I/O ports, eeprom and ram. Do a google search on
either 68hc11/68hc12 and prototype and you'll see a lot of good boards for a
reasonable amount of money.

Fran



On Wed, May 25, 2005 at 07:35:28AM -0700, Andrew wrote:
> All,
> 
> I recently went to my favorite used/surplus electronics/mechanical parts 
> supplier here in Phoenix (Apache Reclamation) - and out in their yard I 
> discovered a whole mess of old slot machines and parts. Some of these 
> parts were logic motherboards, which had on them various 74LSxx parts, 
> some EPROMs, and - a 68B09P processor...
> 
> I am in the process of designing and building a robotic device, and a 
> portion of it I was originally planning to control with a 16F84 PIC - 
> but seeing these 6809 processors lit my eyes up.
> 
> I was wondering if these would be worthwhile to investigate (as I could 
> likely get the boards really cheap), or if I should just stick with PICs 
> - or if the processors might be good for something else?
> 
> I can't find a datasheet, though, to determine this. Unfortunately, I 
> don't know the manufacturer of this particular instance of the chip, either.
> 
> All I have been able to google tells me that this is a 40 pin chip 
> (duh), with a 2MHz internal clock. No mention of any on-board memory or 
> such...
> 
> I realize that there probably isn't an EEPROM or FLASH on board this 
> chip - but how difficult is it to interface such things to it (providing 
> I have datasheets)? Would it be worth the trouble for robotics use, or 
> would I be better served sticking with PICs?
> 
> Something tells me "stick with PICs" - because I fear I would be 
> spending too much time on the interface needs of the 6809 (ie, 
> essentially building a PIC) - but I wanted to get the group's opinion 
> and ideas on the matter, in case someone has some relevant knowledge in 
> the matter.
> 
> Even with using a PIC, this is going to be an "uphill" struggle for me, 
> as I am going to still have to build a simple programmer, learn PIC 
> assembler (or somehow beg/borrow a PIC BASIC compiler), then learn how 
> to use it in a circuit, etc - to control my robot. But, fortunately, 
> there are tons of examples on this on the Net, so though it might be 
> rough, it is doable.
> 
> All I would have using a 6809 would be this forum, any datasheet I could 
> scrounge up, my back stock of old Rainbows, plus the little 
> informational books I have on such old processors (mainly textbooks on 
> interface designs for microprocessors and control use).
> 
> Andrew Ayers
> Glendale, Arizona
> 
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