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davidgiven / cpm65

CP/M for the 6502
BSD 2-Clause "Simplified" License
264 stars 24 forks source link

VT52 waiting for valid escape sequence #107

Closed ivop closed 7 months ago

ivop commented 7 months ago

Hi,

First of all, I'm very pleased to see that VT52 was turned into a loadable driver. Very nice!

The question was asked how to print escape from Altirra BASIC. That can be done with chr$(). For example:

? chr$(27);"H";chr$(27);"J"

To home the cursor and clear screen.

I noticed that when an invalid escape sequence is encountered, it keeps waiting for a valid one. ? chr$(27) <enter> and nothing gets echoed to the screen anymore (but Altirra's input routine does receive the characters). After typing H it "escapes" from that state and everything turns to normal again.

@davidgiven How does one exit atbasic? I can't get out of it! :)

venomix666 commented 7 months ago

Thank you for reporting this.

I missed to handle the invalid escape sequence case in the driver code, I will fix this and submit a pull request.

Oh, and the command to exit atbasic is "BYE". Took a while to find it the first time I got stuck :-D