On 8/13/22 19:43, Spencer wrote:
Hello.
I've been looking for this ROM for my T200 Portoable, but I cannot
find it. Even ebay doesn't have it. Does anyone know where I can get
1 or 2 of these chips?
Thanks
The chip is a custom non-standard pinout mask rom just made for Tandy.
Electrically it is the same as any other mask rom or 27256-minus-Vpp,
except some of the pins are re-arranged so the pinout is different. You
can't buy a chip like that (never could), you can only buy something
else which has the same signal levels and read cycle, and a pinout
adapter, and a means of making a physical connection to that socket when
you can't just use a dip package chip normally the way the custom-pinout
chip could.
If you really want an actual original part, you'll have to set up a
search on ebay, check it every day, and wait and hope a model 200 shows
up for sale some day with one in it. It may be years because 200's
aren't as common, then not everyone even shows a picture of the rom
socket, and then most of those are empty, and of the non-empty, the most
common rom was Multiplan not multi-solutions. Don't hold your breath ;)
If you just want a copy of the rom that you can install and run on a
real 200 and otherwise don't care what physical form it comes in, then
the easiest and most useful thing is to buy a REX# and install the rom
image from the zip file conveniently included right on the REX# docs page.
http://bitchin100.com/wiki/index.php?title=Ordering_Information
http://bitchin100.com/wiki/index.php?title=REXsharp
http://bitchin100.com/wiki/index.php?title=REXsharp#Option_ROM_Images_for_Download
Another option, less flexible and not even cheaper, but simpler and more
like a normal rom, is you could build a Teeprom
http://tandy.wiki/Teeprom and use the same rom image from above to load
onto it.
If you were just looking for a compatible blank chip to install any rom
onto, the answer is the same.
If you just want to use the software and don't even really care about
using a real 200, then I believe both VirtualT and CloudT can run it.
And just to keep everything together, David Anderson provided the manual
in another post: https://archive.org/details/MultiSolutionsRomTandy200
--
bkw
