Hi there in 2025!

A new challenge is brewing, and in the ISA folder you find patches that will
allow to have Tandy sound without ANY NEED for TSR's, INT handlers or other
redirectors. This will allow for AT systems to be free of any hassle of using 
additional redirection in case of port trapping, including EMM386 / QEMM. A 
few games require the INT_C0h trick, because in those cases it was extremely 
difficult to patch otherwise.

You'll find 2 subfolders inside the ISA folder. 1E0h and 2C0h. I strongly
recommend that 1E0h becomes the standard port for AT machines, that was
the port Tandy / Radio Shack chose for their later line of 1000's and 
2500's that still kept the PSSJ.


BE ADVISED:

Most of these patches won't work on a true 8088 system. In order to save space, 
every single byte is valuable, so many inividual single SHIFT instructions were
patched for a single 3 byte instruction. As some of you know, SHL/SHR ROL/ROR 
instructions on the 8088 only support an immediate value of 1, but the 186 
instruction set supported an immediate value of more than 1. 

So, you'll need a NEC V20/V30 or better CPU. This is not an huge issue, as these
patches are intended for AT systems anyway, PC's and XT's can still use the older
patches without any need for redirection too, as they don't have a second DMA 
controller at port 0C0h. 


TNDLPT:

Still a WIP, but i patched a few AGI Sierra interpreters and SCI0 drivers to 
output directly to the Serdaco TNDLPT device. Outputting to the TNDLPT is quite
a bit more involved than just outputting to an I/O port accessible through the
ISA bus. So don't expect big developments on this front, although this is a 
much better scenario for a INT handler that redirects to the LPT port. 

Again, WIP.



Enjoy!!
Yours truly,
CarlosTex