BDOS Function 3 - A_READ should not echo input

[skx]

I put together a simple input-testing binary, because I spent a lot of time fighting with console input, the source and binary can be found here:

• https://github.com/skx/cpmulator/tree/master/samples

Your emulator fails two tests, I think. This bug report is for the first failure.

Not true - second issue is a non-issue - I thought you were behaving incorrectly by terminating input of function 10: Read Console Buffer when the buffer is full, but I think on reflection that if the input size is 10 bytes you should return when the user enters 10 characters - without the need for RETURN. I guess I did the wrong thing in mine :)

I think reading the documentation that Function 3 / A_READ should not echo input. I'm basing that upon reading this guide:

• https://www.seasip.info/Cpm/bdos.html

Here we see:

• BDOS function 1 (C_READ) - Console input
  • Wait for a character from the keyboard; then echo it to the screen and return it.
• BDOS function 3 (A_READ) - Auxiliary (Reader) input
  • Reads a character from the console without checking for ^S / ^Q.

Specifically note that in the second entry there is no reference to "echo".

Similarly in the bigger manual, http://www.gaby.de/cpm/manuals/archive/cpm22htm/ch5.htm#Section_5.2 we see a similar writeup. There is a reference to echo in C_READ but not in A_READ.

So I think my behaviour is correct, but I appreciate this might be a matter of interpretation.

Output from my emulator:

 ./cpmulator samples/intest.com 
Simple input-test program, by Steve.


C_READ Test:
  This test allows you to enter FIVE characters, one by one.
  The characters SHOULD be echoed as you type them.
12345
  Test complete - you entered '12345'.

A_READ Test:
  This test allows you to enter FIVE characters, one by one.
  The characters should NOT be echoed as you type them.
  Test complete - you entered '12345'.

C_RAWIO Test:
  This uses polling to read characters.
  Echo should NOT be enabled.
  Press 'q' to proceed/complete this test.
+

Output from yours:

$ ./target/debug/iz-cpm /home/skx/Repos/github.com/skx/cpmulator/samples/intest.com 
Simple input-test program, by Steve.


C_READ Test:
  This test allows you to enter FIVE characters, one by one.
  The characters SHOULD be echoed as you type them.
12345
  Test complete - you entered '12345'.

A_READ Test:
  This test allows you to enter FIVE characters, one by one.
  The characters should NOT be echoed as you type them.
12345  Test complete - you entered '12345'.

C_RAWIO Test:
  This uses polling to read characters.
  Echo should NOT be enabled.
  Press 'q' to proceed/complete this test.
+

Note the echo'd characters in the section section.

[ivanizag]

I'll agree with you. There is no reference to an echo there.