MITS 2SIO serial chip?

From: Richard Erlacher <edick_at_idcomm.com>
Date: Sun Dec 16 22:49:16 2001

Just how does the FPGA fit in here?

With a 179x and a 9229, you need only a pal and an oscillator. With a 2797 and
no need for data rate changes, i.e. 500 KHz only and MFM only, you only need the
2 MHz oscillator for the 2797 and an address decoder with which to generate the
select. You may want some logic to generate the wait-states, else your CPU may
not make it around the horn, so to speak, in a loop that gets in sync and then
stays there at 2 microseconds per bit.

What goes in the FPGA?

Dick

----- Original Message -----
From: "Ben Franchuk" <bfranchuk_at_jetnet.ab.ca>
To: <classiccmp_at_classiccmp.org>
Sent: Sunday, December 16, 2001 5:27 PM
Subject: Re: MITS 2SIO serial chip?


> Richard Erlacher wrote:
<snip>
... While a 2 Mhz machine would have been the speed of
> system in the 80's I might as well go to 4 Mhz since the FPGA will run
> that fast. As a side note a 2 Mhz machine is about the same speed as a PDP-8.
1.5us
> for a jump. 2.5 us for memory access.
> --
> Ben Franchuk --- Pre-historic Cpu's --
> www.jetnet.ab.ca/users/bfranchuk/index.html
>
>
Received on Sun Dec 16 2001 - 22:49:16 GMT