From c3b0fa04a663fe233765b83d3be41a42aa08c25d Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Mon, 3 May 2021 08:21:10 +0100
Subject: Initial import for public release

---
 lib/cpcrslib/cpc_DisableEnableFirmware.s | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 lib/cpcrslib/cpc_DisableEnableFirmware.s

(limited to 'lib/cpcrslib/cpc_DisableEnableFirmware.s')

diff --git a/lib/cpcrslib/cpc_DisableEnableFirmware.s b/lib/cpcrslib/cpc_DisableEnableFirmware.s
new file mode 100644
index 0000000..00a8710
--- /dev/null
+++ b/lib/cpcrslib/cpc_DisableEnableFirmware.s
@@ -0,0 +1,28 @@
+.globl _cpc_DisableFirmware
+
+_cpc_DisableFirmware::
+	DI
+	LD HL,(#0X0038)
+	LD (backup_fw),HL
+	LD HL,#0X0038
+	LD (HL),#0XFB		;EI
+	INC HL
+	LD (HL),#0XC9		;RET
+	EI
+	RET
+
+backup_fw:
+	.DW  #0
+
+.globl 	_cpc_EnableFirmware
+
+_cpc_EnableFirmware::
+	DI
+	LD DE,(backup_fw)
+	LD HL,#0X0038
+	LD (HL),E			;EI
+	INC HL
+	LD (HL),D			;RET
+	EI
+	RET
+
-- 
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