Man, I'm reaching WAY back here.  I haven't played with ts stuff in ages,
but as near as I can recall:

8755 is 2K x 8 EPROM & I/O in a 40-pin package.
8155 is RAM and I/O
Neither one has a USART or EEPROM.  For that you'd be best off going with
run of the mill parts like 2864 and AY-3-1015 or something, but then you
need an 8-bit latch to demux the address/data bus.  The 8x55 parts have
the muxed bus logic built in, so with 3 parts you have CPU, EPROM, RAM,
and lots of I/O -- but no USART and no EEPROM.  Remember this is late 70s
- eary 80s technology.  There may be something newer that would be simpler
to interface, I dunno.

Somewhere I have an old Ciarca's Circuit Cellar book from about 1980 or
so, with detailed information on a 3-chip 8088 system running a
multi-user, multitasking system supporting two 300bps ASCII terminals --
all with 2K or EPROM and a tiny bit of RAM!  I'll see if I can dig it out
or see if it's available on the web.

Dale

On Mon, 23 Apr 2001, dr. Imre Bartfai wrote:

> Hi,
>
> I am very interested how to build a minimal 8088 system, so could you tell
> us please what another chips are needed. I think of a minimal system with
> SRAM and EEPROM, USART. What do I need yet?
>
> Thank you.
> Imre
>
>
> On Sat, 21 Apr 2001, Dale Botkin wrote:
>
> > On Sat, 21 Apr 2001, Chris Pringle wrote:
> >
> > > Wow, I never knew any of that.
> > > So, can you still buy 8088s? And, if so, what can they do. Do you need
> > > EPROMS for memory? Can they be used in the same way as a PIC can?
> >
> > Yes, 8088's are still available.
> >
> > They can do anything an 8086 can do...  which is to say, most of what a
> > Pentium-III can do, but without the memory management (and way slower).
> > 1MB physical address limit, segmented into 64K banks.  The chip is a CPU,
> > not an MPU, and has no internal ROM, EPROM, RAM, peripheral functions, or
> > anything other than the processor itself.  So no, you ca't use it as a
> > single-chip embedded processor, but I've seen designs with as few as 3
> > 40-pin packages.  It's more suited to larger and more complex embedded
> > tasks or general-purpose computers -- the IBM PC & XT used the 8088, as
> > did many other systems.
> >
> > Dale
> > ---
> > The most exciting phrase to hear in science, the one that heralds new
> > discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
> >                 -- Isaac Asimov
> >
> > --
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> >
> >
> >
> >
>
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---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
                -- Isaac Asimov

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