z180: note a safe case

diff --git a/Kernel/dev/devrd_z180_hw.s b/Kernel/dev/devrd_z180_hw.s
index 2edd4a1..fb9b850 100644 (file)
--- a/Kernel/dev/devrd_z180_hw.s
+++ b/Kernel/dev/devrd_z180_hw.s
@@ -43,6 +43,7 @@ _devmem_go:
 ;=========================================================================
 ; _rd_page_copy - Copy data from one physical page to another
 ; See notes in devrd.h for input parameters
+; This code is Z180 specific so can safely use ld a,i
 ;=========================================================================
 _rd_platform_copy:
         ; save interrupt flag on stack then disable interrupts