From b2049cf29d742e7804eb32fdf9d2fb6d17c03990 Mon Sep 17 00:00:00 2001
From: Robert Lowry <bobertlo@gmail.com>
Date: Tue, 19 Nov 2024 19:47:08 -0600
Subject: [PATCH] compiler: handle 88 dat op address modes properly (#79)

---
 compile.go | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/compile.go b/compile.go
index 3aba9c0..d555fdd 100644
--- a/compile.go
+++ b/compile.go
@@ -115,9 +115,14 @@ func (c *compiler) expandExpression(expr []token, line int) ([]token, error) {
 }
 
 func (c *compiler) assembleLine(in sourceLine) (Instruction, error) {
+	opLower := strings.ToLower(in.op)
 	var aMode, bMode AddressMode
 	if in.amode == "" {
-		aMode = DIRECT
+		if c.config.Mode == ICWS88 && opLower == "dat" {
+			aMode = IMMEDIATE
+		} else {
+			aMode = DIRECT
+		}
 	} else {
 		mode, err := getAddressMode(in.amode)
 		if err != nil {
@@ -126,7 +131,11 @@ func (c *compiler) assembleLine(in sourceLine) (Instruction, error) {
 		aMode = mode
 	}
 	if in.bmode == "" {
-		bMode = DIRECT
+		if c.config.Mode == ICWS88 && opLower == "dat" {
+			bMode = IMMEDIATE
+		} else {
+			bMode = DIRECT
+		}
 	} else {
 		mode, err := getAddressMode(in.bmode)
 		if err != nil {