diff --git a/conf/epple2.conf.in b/conf/epple2.conf.in
index cf84256..1e51024 100644
--- a/conf/epple2.conf.in
+++ b/conf/epple2.conf.in
@@ -11,12 +11,12 @@
 
 
 
-# standard 48K RAM
+# standard 48K RAM with mixed chip brands
 motherboard ram E MM5290 MM5290 MM5290 MK4116 MM5290 MM5290 MM5290 MK4116
-motherboard ram D MM5290 MM5290 MK4116 MK4116 MM5290 MK4116 MM5290 MCM4116
-motherboard ram C MK4116 MK4116 MM5290 MM5290 MM5290 MM5290 MM5290 MM5290
 motherboard strap E 16K 8000
+motherboard ram D MM5290 MM5290 MK4116 MK4116 MM5290 MK4116 MM5290 MCM4116
 motherboard strap D 16K 4000
+motherboard ram C MK4116 MK4116 MM5290 MM5290 MM5290 MM5290 MM5290 MM5290
 motherboard strap C 16K 0000
 
 # Demo system ROM for the emulator. This is only to allow the
@@ -61,3 +61,79 @@ import slot 4 rom 0 $(PREFIX)lib/epple2/cards/clock.a65
 
 #revision 0
 revision 1
+
+
+
+
+
+# Alternate motherboard RAM configurations.
+# See Apple II Reference Manual, "RAM Configuration Blocks," pp. 70-71.
+
+# 4K
+#motherboard ram c 4096
+#motherboard strap c 4K 0000
+
+# 8K
+#motherboard ram d 4096
+#motherboard strap d 4K 1000
+#motherboard ram c 4096
+#motherboard strap e 4K 2000
+
+# 12K
+#motherboard ram e 4096
+#motherboard strap e 4K 2000
+#motherboard ram d 4096
+#motherboard strap d 4K 1000
+#motherboard ram c 4096
+#motherboard strap c 4K 0000
+
+# 16K
+#motherboard ram c 16K
+#motherboard strap c 16K 0000
+
+# 20K
+#motherboard ram d 4096
+#motherboard strap d 4K 4000
+#motherboard ram c 4116
+#motherboard strap c 16K 0000
+
+# 24K
+#motherboard ram e 4096
+#motherboard strap e 4K 5000
+#motherboard ram d 4096
+#motherboard strap d 4K 4000
+#motherboard ram c 4116
+#motherboard strap c 16K 0000
+
+# 32K
+#motherboard ram d 4116
+#motherboard strap d 16K 4000
+#motherboard ram c 4116
+#motherboard strap c 16K 0000
+
+# 36K
+#motherboard ram e 4096
+#motherboard strap e 4K 8000
+#motherboard ram d 4116
+#motherboard strap d 16K 4000
+#motherboard ram c 4116
+#motherboard strap c 16K 0000
+
+# 48K
+#motherboard ram e 4116
+#motherboard strap e 16K 8000
+#motherboard ram d 4116
+#motherboard strap d 16K 4000
+#motherboard ram c 4116
+#motherboard strap c 16K 0000
+
+
+
+
+# 12K (with hi-res graphics)
+#motherboard ram e 4096
+#motherboard strap e 4K 3000
+#motherboard ram d 4096
+#motherboard strap d 4K 2000
+#motherboard ram c 4096
+#motherboard strap c 4K 0000
diff --git a/doc/commands.asciidoc b/doc/commands.asciidoc
index 953e0bd..4fc1405 100644
--- a/doc/commands.asciidoc
+++ b/doc/commands.asciidoc
@@ -52,7 +52,7 @@ anchor:motherboard[]
 The +motherboard+ command configures the emulated Apple's motherboard RAM chips and strapping block.
 
 --------
-motherboard ram   {C|D|E} { 4K | 4096 | 16K | 4116 | - } [...up to 8]
+motherboard ram   {C|D|E} { 4K | 4096 | 16K | 4116 | - | (other-models) } [...up to 8]
 motherboard strap {C|D|E} { 4K | 16K } <base>
 --------
 
@@ -67,6 +67,15 @@ For more information about RAM configuration, see
 https://archive.org/details/Apple_II_Reference_Manual_1979_Apple/page/n79[Christopher Espinosa, Apple II Reference Manual
 (Cupertino, Calif.: Apple Computer, 1978), pp. 70-72].
 
+In the +motherboard ram+ configuration line `(other-models)` of chips are supported, and will produce different bit patterns at power-on time:
+--------
+MM5290
+MK4116
+MCM4116
+--------
+
+
+
 Example of normal 48K RAM configuration:
 --------
 ram e 16K