I just purchased the Tandy 2000 MS-DOS 2.11 Boot Diskette with the Digi-Mouse and Clock drivers included. I don't have a working Tandy 2000 at the moment (I am currently working on that), but I should be able to make a copy on computer with a 1.2MB diskette drive using ImageDisk. I will be sure...
Serial ports do not apply here. This for the Digi-Mouse/Clock board. The Digi-Mouse is basically a Bus Mouse with a DB9 connector. In theory it should operate the same on the Tandy 1000 or Tandy 2000 with a Digi-Mouse./Clock board.
This diskette for sale on eBay is for the Tandy 1000, but I think it should work on the Tandy 2000 Digi-Mouse/Clock board as well.
https://www.ebay.com/itm/285679505910?hash=item4283d351f6:g:IFEAAOSwDx9ku7kB
I have been in contact with the webmaster for RGB Classic Games, who also hosts copies of GRAFIX for downloading. He has been nice enough to publish an online version of the manual for GRAFIX. He has updated it to the current version 2.70. You can access the manual at the following URL...
GRAFIX is a graphics & sound TSR API for the Tandy 1000/PCjr. I wrote the initial version all the way back in 1988. The latest version 2.7 adds support for the IBM PCjr. The Github repository is located at the following URL:
https://github.com/jasa1063/GRAFIX
Enjoy!
Why do you need a Tandy 1000 EX ROM when the Tandy 1000 EX is not a supported emulated system on PCem in the first place? The Tandy 1000 SX is also not supported. Either ROM would do you no good.
Sure you can go the 68030 route, but it is not the same as having the 68020/68851 combo, which is what I was looking for. That is unique to the entire Macintosh line of computers.
I just wanted to add I did get another quote from www.ovaga.com that came in at $120. Again a bit steep, but it is another source if someone is looking for one.
I tested MS-DOS built into ROM on my Tandy 1000 SL/2 configuration in 86Box and it does work. You need to run the SETUPSL2 to make sure that everything is configured first. I assume you would need to do the same thing for the Tandy 1000 HX setup as well.