On Wed, Dec 21, 2022 at 5:10 PM John R. Hogerhuis <[email protected]> wrote:
> Given that it wasn't actually using flow control I see no reason to make a > simple 3 wire cable fail. It's punishingly opinionated. Sort of like Frank > Lloyd Wright building interior walls at an angle because he didn't like > people hanging pictures in the houses he made for them. > Heh! I heard they hung pictures anyway. And, of course, I agree that TELCOM shouldn't have cared about DSR unless it had a mighty good reason. Let's see if I got this right, Model 100: Ignores DSR Tandy 200: Becomes punishingly opinionated about DSR Tandy 102: Goes back to ignoring DSR Maybe someone at Microsoft was attempting to add flow control to the Tandy 200 ROM and got it partially done before they had to ship. Does anyone know how to check the DSR register on the UART from BASIC? I see something about I/O ports in the service manual <https://archive.org/details/Model_200_Portable_Computer_Service_Manual_19xx_Tandy/page/n22/mode/1up?view=theater>, but I'm not clear what port I should be reading or how. Thanks! —b9
