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itty-bitty-vtty
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head/tail swapped.

This commit is contained in:
Kelvin Sherlock 2022-01-15 16:31:38 -05:00
parent ea6ee76a9d
commit 900dccb3d1
1 changed files with 6 additions and 5 deletions
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11
vt100.modem.S
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@ -169,6 +169,7 @@ modem_int
phk
plb
lda SCCBREG ; sync
stz SCCBREG
lda SCCBREG
and #%0000_0001 ; rx ready.
@ -176,9 +177,9 @@ modem_int
:read
lda SCCBDATA
ldx DPAGE+read_q_tail
ldx DPAGE+read_q_head
sta read_buffer,x
inc DPAGE+read_q_tail
inc DPAGE+read_q_head
* more?
stz SCCBREG
@ -329,12 +330,12 @@ read_modem_async ent
php
sei
ldx read_q_head
cpx read_q_tail
ldx read_q_tail
cpx read_q_head
beq :nope
lda read_buffer,x
inc read_q_head
inc read_q_tail
plp
sec
rts