http://bitchin100.com/wiki/index.php?title=NSC800_Conversion
created a wiki page with info... Steve
On 10/5/2020 7:33 AM, Stephen Adolph wrote:
Cool, That's much more compact than my dual board.
You're free to have it (I'll put it up on github, though until I can
recreate enough of the 8085 signals, it might not be as useful as the
below).
I will caution you that the busses and signals on
Cool, That's much more compact than my dual board.
I will caution you that the busses and signals on the processors may not be
tri state; in my design I fully buffered every CPU signal. I would have to
check my notes as to which signals I found would be problems.
[image: image.png]
On 10/4/2020 1:24 PM, Stephen Adolph wrote:
A Z80 isn't a good natural fit as the M100 is designed around the
multiplexed address/data bus with the ALE signal to latch.
That's why the NSC800 exists; it was National Semiconductor taking
advantage of Z80 improvements, while leveraging the chip
> And, on the LCD you can see the startup screen for Turbo Pascal.
> PROVING it is a Z80!
This is pretty incredible.
--
bkw
Good point, and fair question.
I do have the dual implementation working also.
Single cpu simpler to implement. The dual CPU board is more complex and
harder to build. Si gle cpu is pretty simple.
Also it can be tricky to avoid cold restarts and worse wiping out the disk.
If you dont remember
Well done Steve with this development.
I recall you toyed with the idea of dual processors, ie existing 80C85
for M100 mode & NSC800 for Z80 CP/M mode. What was the outcome of that
& why have you gone solely NSC800 please?
Philip
On 5/10/2020 7:24 am, Stephen Adolph wrote:
The processor
to NSC800 (aka Z80) part 2
The processor adapter board is low profile, having pins short enough to allow
the PCB itself to rest on the socket, on the main board.
Then there is enough room for the CPU socket for the NSC800.
The main rom, being closer to the front, has less room. In that case
The processor adapter board is low profile, having pins short enough to
allow the PCB itself to rest on the socket, on the main board.
Then there is enough room for the CPU socket for the NSC800.
The main rom, being closer to the front, has less room. In that case, no
socket for the option rom.
How is the fit, with the socket and adapter? Is there room?
Has anyone tried to support a Z80 in the same way?
Are your design plans available anywhere?
JIm
Amazing work, Steve, it’s inspiring. Thanks for the update.
CAM
--
C.A. Magaret
Sent from my newfangled mobile technogizmo. Please forgive any typos,
inelegant brevity, or nonsensical auto-corrections.
> On Oct 4, 2020, at 06:23, Stephen Adolph wrote:
>
>
> The NSC800 does need
11 matches
Mail list logo
