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Atari: fix stray cursor image when connecting to BSDs.

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FreeBSD and NetBSD, at least, have a banner message when you telnet into them
which has an empty line as first line. On those systems, an old "cursor" char
was visible at the top of the login prompt message.
This is fixed by enabling and disabling the cursor in 'get_key' while waiting
for a key press.
This commit is contained in:
Christian Groessler 2017-09-04 20:03:50 +02:00
parent 0a546a7eef
commit 96cfc32511
1 changed files with 20 additions and 1 deletions
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21
drivers/atrinput.s
View File

@ -9,6 +9,7 @@
.exportzp abort_key_disable = 0
.import ip65_process
.import print_a
.data
@ -75,8 +76,26 @@ special_key_table2:
; inputs: none
; outputs: A contains ASCII value of key just pressed
get_key:
lda #0
sta CRSINH ; cursor on
; according to "Mapping the Atari", a change to CRSINH will only be in effect after the next cursor movement,
; so we move the cursor one to the left and then one to the right (to keep its original position)
lda #ATLRW
jsr print_a
lda #ATRRW
jsr print_a
@loop:
jsr get_key_if_available
bcc get_key
bcc @loop
ldy #1
sty CRSINH ; cursor on
tay ; save key
; see above comment wrt. "Mapping the Atari"
lda #ATLRW
jsr print_a
lda #ATRRW
jsr print_a
tya ; restore key
rts
; inputs: none