Thanks much, and wow.
If you look at page 71, pages 70 and 71 are the same, but 70 is a low
res scan and 71 is a high res scan. It shows both the main and option
roms right next to each other and sure enough shows that their pinouts
are different.
I have uploaded a cropped and de-duped copy to archive.org, so for
everyone else, you can see page 70 here:
https://archive.org/details/kyotronic-kc-85-service-manual/
(download the pdf, the web viewer is super blurry)
https://archive.org/download/kyotronic-kc-85-service-manual/Kyotronic_KC-85_Service_Manual.pdf
I have the user guide and basic manuals, and I just noticed that the
user guide the section at the end with all the interface pinouts,
doesn't even mention the option rom socket at all, even though it does
include the system bus socket. Though does not include the ram sockets
either. Even the service manual doesn't mention the option rom socket in
the same section where all the other interfaces are described. Strange.
I guess this means that if you ever wanted to create an option rom for
KC-85, you'd actually have to use a Teeprom or REX to do it!
This is super strange. Maybe the M100 pinout was not invented custom for
the M100 after all? Like maybe Sharp already had a mask rom model with
this pinout that Kyocera & Tandy just selected from Sharp's existing
offerings? Or Kyocera created the custom pinout just for the option rom
for some reason, and Tandy just kept it and even went further to apply
it to the main rom, again "for some reason"?
--
bkw
On 12/31/21 4:59 PM, Stephen Adolph wrote:
Brian,
I will send you a link.
schematic is a bit blurry.
ALE on pin 23. yep same as M100.
image.png
I still have the original with me, maybe I can get some better diagrams
scanned.
Steve
On Fri, Dec 31, 2021 at 4:51 PM Brian K. White <[email protected]
<mailto:[email protected]>> wrote:
On 12/31/21 11:16 AM, Stephen Adolph wrote:
> Yep. Some M100s were built with that PCB, as was the KC-85.
Makes sense.
> cheers
> Steve
Could you send me the docs you have for the kc-85? A few months ago I
asked if anyone had downloaded the service manual from the now-dead
link
in Don Fox's member directory on club100.
http://club100.org/memfiles/index.php?directory=Don%20Fox
<http://club100.org/memfiles/index.php?directory=Don%20Fox>
At that time you said that you thought you had it and would look.
I can't believe it's really the same pcb, because if nothing else, I
can't believe the kc-85 would have the m100 pinout for the option rom,
and even the late model 100's with a standard pinout for the main rom
still have the 100 pinout for the option rom.
kc-85 also has no bcr port or modem, but it does have the
footprints, so
possibly the related parts could be populated.
--
bkw
--
bkw
