Reply 20 of 26, by Servo
I'm not sure if this is related, but I get those same green dot patterns with Tandy GW-Basic in screen 3 or screen 5 (160x200x16 and 320x200x16 modes). Using the exact same basic.exe on a real Tandy (or with PCjr cartridge basic) does not result in the patterns. I'm using the official 0.74 version for this.
The test program is
20 SCREEN 5
(or screen 3)
In both cases the dots result and commands are no longer executed after the program is finished. It is possible to clear the screen again after setting the mode and the program will continue to run fine until it's done, but once done enter commands does nothing further.