[sdiy] IN your mind, what is ....

[Theo]

Yes, but I found it two steps backward from the TMS9900 on what I learned
assembly coding.

If you thing 1602 or 1802 are strange take a go at the TMS9900.
- No things like a stack (doesn't need it),
- the whole memory (32k x16) counts as registers (that's a few more than the
6809 has)
- there are addressing modes to access the memory of other 9900s and
- includes a separate address space for 32K x 16 I/O lines.
You need to add "some" IO expander ICs if you want to use them all though...

Especially the fact that the whole memory could be used as registers made
this thing real nice to work on.
Its kind of like the ARM where you have 15 register sets to swap, only
better :)

Theo


----- Original Message -----
From: Paul Maddox <P.Maddox at signal.qinetiq.com>
To: Synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Monday, February 02, 2004 12:18 PM
Subject: Re: [sdiy] IN your mind, what is ....


> > > >The 'real' Chromas use - tadaa - the 6809 (hello Rainer ;-)
>
> as do the PPG and many 80's classics...
> it was THE processor back then.
>
> Paul
>