From 3ef964e74d6ac990eef6cf3747ce5a3a4d63a5a8 Mon Sep 17 00:00:00 2001
From: Virgil Dupras <hsoft@hardcoded.net>
Date: Mon, 4 Nov 2019 14:44:43 -0500
Subject: [PATCH] acia: make GetC blocking

---
 kernel/acia.asm | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/kernel/acia.asm b/kernel/acia.asm
index 2cede2f..fe66274 100644
--- a/kernel/acia.asm
+++ b/kernel/acia.asm
@@ -98,17 +98,17 @@ aciaInt:
 	reti
 
 
-; *** BLOCKDEV ***
-; These function below follow the blockdev API.
+; *** STDIO ***
+; These function below follow the stdio API.
 
 aciaGetC:
 	push	de
-
+.loop:
 	ld	a, (ACIA_BUFWRIDX)
 	ld	e, a
 	ld	a, (ACIA_BUFRDIDX)
 	cp	e
-	jr	z, .nothingToRead	; equal? nothing to read.
+	jr	z, .loop	; equal? nothing to read. loop
 
 	; Alrighty, buffer not empty. let's read.
 	ld	de, ACIA_BUF
@@ -120,12 +120,6 @@ aciaGetC:
 
 	; And finally, fetch the value.
 	ld	a, (de)
-	cp	a		; ensure Z
-	jr	.end
-
-.nothingToRead:
-	call	unsetZ
-.end:
 	pop	de
 	ret