Do you by any chance have an 8201/8201a ?
Mine was loadable fine in a 8201a, and then was usable fine in the 8300.
If you don't have a 8201, if you didn't mind mailing it I could update
it for you and load up whatever option roms you want. There's only a few
anyway.
Separately, tandy.wiki/FlashROM_8300 is verified and works to make a y2k
patched 8300 system rom too if you are able to build it.
Also I have 2 early version FlashROM_8300 all built and working if
anyone wants one for free.
https://photos.app.goo.gl/SZYN5RPbF8ptyHUC9
They are an earlier version that has 28 pins like the socket. They're
fine, and even still easily re-writable by just popping the board right
in a programmer's zif socket. It's just a little more complicated to
program than the final 32-pin version because you have to place it in
the programmer in a special way offset by 2 rows, and attach 3 wires to
some pin headers on the board and move a couple jumpers... The final
version just has the extra pins built in is all. Same board otherwise.
I have one with a TSOP-32 chip and one with a PLCC-32 chip.
Just to be clear this is only for PC-8300. 8201 has a completely
different main rom even thought they are both DIP-28. 8201 could use a
plain 27C256 directly.
--
bkw
On 4/8/20 3:59 PM, Fred Whitaker wrote:
The NEC REX has pins that insert into a socket, unlike the Model 100. I
am always careful about how I insert the module into it’s socket.
Fred
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
Windows 10
*From: *Josh Malone <mailto:[email protected]>
*Sent: *Tuesday, April 7, 2020 3:56 PM
*To: *[email protected] <mailto:[email protected]>
*Subject: *Re: [M100] update- build 260
Check the physical insertion of the REX module. I've had that issue with
bad contacts.
On Tue, Apr 7, 2020, 3:26 PM Fred Whitaker <[email protected]
<mailto:[email protected]>> wrote:
Stephen
I also have noticed a problem with installing REX fresh on an NEC
PC-8300. I have two of them that work, and one that doesn't. I was able
after about thirty minutes to a fresh install of the REX software on one
of my NEC machines, but the other one still hangs up during the stage
where the memory banks are being erased It has to be a subtle difference
between the 8201 and the 8300 that causes it. I gave up on the one and
inserted a TS-DOS Rom into it instead of the REX for now.
All of my model 100 computers did well with the update. It was quick and
easy.
I still prefer the Model 100 keyboard to the NEC PC-8300 keyboard. There
is a slight difference that takes getting used to. I also prefer the
Model 100 keyboard to the Notebook PC's that I have. The Capacitance
mouse is a real nuisance, and I can't usually turn it off.
Fred Whitaker
On 4/6/2020 12:16 AM, Stephen Adolph wrote:
> build 260 for REX is on the wiki. Let me know of any problems.
> * Peter's recent bug is fixed
> * found a bug in 258 that was serious, on T200
>
> Regarding the last bug. T200 has different treatment of .DO files in
> RAM compared to other models. Pointers are used differently.
>
--
bkw
