diff --git a/desktop/desktop_main.s b/desktop/desktop_main.s
index dbca50c..737dbb9 100644
--- a/desktop/desktop_main.s
+++ b/desktop/desktop_main.s
@@ -856,8 +856,6 @@ L46AE:  jsr     disable_eject_menu_item
 .proc MLI_RELAY
         sty     call
         stax    params
-        php
-        sei
         sta     ALTZPOFF
         sta     ROMIN2
         jsr     MLI
@@ -867,7 +865,6 @@ params: .addr   dummy0000
         tax
         lda     LCBANK1
         lda     LCBANK1
-        plp
         txa
         rts
 .endproc
diff --git a/desktop/loader.s b/desktop/loader.s
index cc91b0f..1b7dec6 100644
--- a/desktop/loader.s
+++ b/desktop/loader.s
@@ -265,21 +265,13 @@ start:
         bpl     :-
 
         ;; Open this system file
-        php
-        sei
         MLI_CALL OPEN, open_params
-        plp
-        and     #$FF            ; ???
         beq     :+
         brk                     ; crash
 :       lda     open_params::ref_num
         sta     set_mark_params::ref_num
         sta     read_params::ref_num
-        php
-        sei
         MLI_CALL SET_MARK, set_mark_params
-        plp
-        and     #$FF            ; ???
         beq     :+
         brk                     ; crash
 :       lda     #0
@@ -290,11 +282,7 @@ loop:   lda     segment_num
         bne     continue
 
         ;; Close and invoke DeskTop init routine
-        php
-        sei
         MLI_CALL CLOSE, close_params
-        plp
-        and     #$FF            ; ???
         beq     :+
         brk                     ; crash
 :       jmp     DESKTOP_INIT
@@ -304,11 +292,7 @@ continue:
         tax
         copy16  segment_addr_table,x, read_params::data_buffer
         copy16  segment_size_table,x, read_params::request_count
-        php
-        sei
         MLI_CALL READ, read_params
-        plp
-        and     #$FF            ; ???
         beq     :+
         brk                     ; crash
 :       ldx     segment_num
diff --git a/desktop/ovl1.s b/desktop/ovl1.s
index be87012..dffb084 100644
--- a/desktop/ovl1.s
+++ b/desktop/ovl1.s
@@ -81,8 +81,6 @@ start:  lda     #$80
         sty     call
         sta     params
         stx     params+1
-        php
-        sei
         sta     ALTZPOFF
         lda     ROMIN2
         jsr     MLI
@@ -92,7 +90,6 @@ params: .addr   0
         sta     ALTZPON
         lda     LCBANK1
         lda     LCBANK1
-        plp
         txa
 self:   bne     self            ; hang on error?
         rts
diff --git a/desktop/ovl1a.s b/desktop/ovl1a.s
index 3219154..e97628d 100644
--- a/desktop/ovl1a.s
+++ b/desktop/ovl1a.s
@@ -120,13 +120,9 @@ loop:   lda     (src),y
 .proc MLI_RELAY
         sty     call
         stax    params
-        php
-        sei
         jsr     MLI
 call:   .byte   0
 params: .addr   0
-        plp
-        and     #$FF
 self:   bne     self            ; hang if fails
         rts
 .endproc
diff --git a/desktop/ovl1c.s b/desktop/ovl1c.s
index 581c755..641be17 100644
--- a/desktop/ovl1c.s
+++ b/desktop/ovl1c.s
@@ -630,8 +630,6 @@ on_line_buffer:
 .proc MLI_RELAY
         sty     call
         stax    params
-        php
-        sei
         sta     ALTZPOFF
         lda     ROMIN2
         jsr     MLI
@@ -641,7 +639,6 @@ params: .addr   0
         sta     ALTZPON
         lda     LCBANK1
         lda     LCBANK1
-        plp
         txa
         rts
 .endproc
diff --git a/desktop/ovl2.s b/desktop/ovl2.s
index cc90d5e..758ebd9 100644
--- a/desktop/ovl2.s
+++ b/desktop/ovl2.s
@@ -516,6 +516,8 @@ L0D8D:  .byte   0
 
         PAD_TO $E00
 
+; This is (probably) a Disk II formatter routine
+
 L0E00:  php
         sei
         jsr     L0E3A
@@ -1063,8 +1065,6 @@ L124A:  .byte   $00
 .proc MLI_RELAY
         sty     call
         stax    params
-        php
-        sei
         sta     ALTZPOFF
         lda     ROMIN2
         jsr     MLI
@@ -1074,7 +1074,6 @@ params: .addr   0
         sta     ALTZPON
         lda     LCBANK1
         lda     LCBANK1
-        plp
         txa
         rts
 .endproc
diff --git a/desktop/ovl3.s b/desktop/ovl3.s
index 1fc2b7d..d155a67 100644
--- a/desktop/ovl3.s
+++ b/desktop/ovl3.s
@@ -1424,8 +1424,6 @@ L9DC8:  .byte   0
 .proc MLI_RELAY
         sty     call
         stax    params
-        php
-        sei
         sta     ALTZPOFF
         sta     ROMIN2
         jsr     MLI
@@ -1435,7 +1433,6 @@ params: .addr   0
         tax
         lda     LCBANK1
         lda     LCBANK1
-        plp
         txa
         rts
 .endproc
diff --git a/desktop/ovl4.s b/desktop/ovl4.s
index 2e788da..12c58b4 100644
--- a/desktop/ovl4.s
+++ b/desktop/ovl4.s
@@ -844,8 +844,6 @@ L5993:  .byte   0
 .proc MLI_RELAY
         sty     call
         stax    params
-        php
-        sei
         sta     ALTZPOFF
         lda     ROMIN2
         jsr     MLI
@@ -855,7 +853,6 @@ params: .addr   0
         tax
         lda     LCBANK1
         lda     LCBANK1
-        plp
         txa
         rts
 .endproc