diff --git a/apps/ed/buf.asm b/apps/ed/buf.asm
index 988f191..20b19b6 100644
--- a/apps/ed/buf.asm
+++ b/apps/ed/buf.asm
@@ -1,12 +1,5 @@
 ; buf - manage line buffer
 ;
-; *** Consts ***
-;
-; Maximum number of lines allowed in the buffer.
-.equ	BUF_MAXLINES	0x800
-; Size of our scratchpad
-.equ	BUF_PADMAXLEN	0x1000
-
 ; *** Variables ***
 ; Number of lines currently in the buffer
 .equ	BUF_LINECNT	BUF_RAMSTART
@@ -14,11 +7,11 @@
 .equ	BUF_LINES	BUF_LINECNT+2
 ; Points to the end of the scratchpad, that is, one byte after the last written
 ; char in it.
-.equ	BUF_PADEND	BUF_LINES+BUF_MAXLINES*2
+.equ	BUF_PADEND	BUF_LINES+ED_BUF_MAXLINES*2
 ; The in-memory scratchpad
 .equ	BUF_PAD		BUF_PADEND+2
 
-.equ	BUF_RAMEND	BUF_PAD+BUF_PADMAXLEN
+.equ	BUF_RAMEND	BUF_PAD+ED_BUF_PADMAXLEN
 
 ; *** Code ***
 
diff --git a/apps/ed/glue.asm b/apps/ed/glue.asm
index 5a5a5cb..5956aed 100644
--- a/apps/ed/glue.asm
+++ b/apps/ed/glue.asm
@@ -1,4 +1,13 @@
 #include "user.h"
+
+; *** Overridable consts ***
+; Maximum number of lines allowed in the buffer.
+.equ	ED_BUF_MAXLINES		0x800
+; Size of our scratchpad
+.equ	ED_BUF_PADMAXLEN	0x1000
+
+; ******
+
 #include "err.h"
 .org	USER_CODE
 
@@ -14,4 +23,3 @@
 #include "ed/cmd.asm"
 .equ	ED_RAMSTART	CMD_RAMEND
 #include "ed/main.asm"
-
diff --git a/recipes/sms/romasm/user-tmpl.h b/recipes/sms/romasm/user-tmpl.h
index cbcfd20..ba23a5b 100644
--- a/recipes/sms/romasm/user-tmpl.h
+++ b/recipes/sms/romasm/user-tmpl.h
@@ -4,6 +4,9 @@
 .equ    USER_RAMSTART   0xc200
 .equ    FS_HANDLE_SIZE  6
 .equ    BLOCKDEV_SIZE   8
+; Make ed fit in SMS's memory
+.equ    ED_BUF_MAXLINES 0x100
+.equ    ED_BUF_PADMAXLEN 0x800
 
 ; *** JUMP TABLE ***
 .equ	strncmp			0x03