[sdiy] 8031's & serial EEPROM's? for MIDI...

[anthony]

 > For interfacing a 27xxx EPROM to a 8031 you still need one other
> component: a 74x373 or 74x573 latch.

Oh I have at least 20 74LS373's, a handful of various 74HC573's, 74HCT373's 
and what-not. I always save everything I desolder even if I can't think of a 
use off hand when I'm doing it because - well you never know...


> However, with only an EPROM as program memory, software development  by 
> burn-and-learn gets very tedious. You're much better off with  additional 
> RAM as program memory (on the 8031 program and data memory  are not the 
> same by default, but you can use one RAM chip for both).  Have some 
> bootloader in EEPROM to get your code into RAM to test it.  Once your 
> program works (and doesn't need to much data RAM) you can  remove the RAM 
> or re-build the thing without RAM. The 8031 has a tiny  on-chip data RAM.

I have a bunch of CXK5825's, W2465's,  HY6264 and a ton of other static 
RAM's - some fast some slow. I think the 6264 would be the one to use with 
the 8031 (because I'm pretty sure that was the case in the gear the units 
were removed from).

> With Flash on-chip program memory all those issues are non existent.

Yes I would actually love to get into the newer flash-based mCU's like PIC's 
and the Atmel stuff. But the 8031 works very well in a MIDI environment, no?

eBay does help facillitate a lot of options...

aa
> Ingo
>