diff --git a/resources/systems/macos/es_systems.xml b/resources/systems/macos/es_systems.xml
index bf4a7f37d..6b356c572 100644
--- a/resources/systems/macos/es_systems.xml
+++ b/resources/systems/macos/es_systems.xml
@@ -1339,8 +1339,8 @@
         <name>ti99</name>
         <fullname>Texas Instruments TI-99</fullname>
         <path>%ROMPATH%/ti99</path>
-        <extension>.7z .7Z .zip .ZIP</extension>
-        <command>PLACEHOLDER %ROM%</command>
+        <extension>.rpk .RPK .7z .7Z .zip .ZIP</extension>
+        <command label="MAME (Standalone)">%STARTDIR%=~/.mame %EMULATOR_MAME% -rompath %ROMPATH%/ti99 ti99_4a -ioport peb -ioport:peb:slot3 speech -cart %BASENAME%</command>
         <platform>ti99</platform>
         <theme>ti99</theme>
     </system>
diff --git a/resources/systems/unix/es_systems.xml b/resources/systems/unix/es_systems.xml
index 81dadb168..54690ba3f 100644
--- a/resources/systems/unix/es_systems.xml
+++ b/resources/systems/unix/es_systems.xml
@@ -1362,8 +1362,8 @@
         <name>ti99</name>
         <fullname>Texas Instruments TI-99</fullname>
         <path>%ROMPATH%/ti99</path>
-        <extension>.7z .7Z .zip .ZIP</extension>
-        <command>PLACEHOLDER %ROM%</command>
+        <extension>.rpk .RPK .7z .7Z .zip .ZIP</extension>
+        <command label="MAME (Standalone)">%STARTDIR%=~/.mame %EMULATOR_MAME% -rompath %ROMPATH%/ti99 ti99_4a -ioport peb -ioport:peb:slot3 speech -cart %BASENAME%</command>
         <platform>ti99</platform>
         <theme>ti99</theme>
     </system>
diff --git a/resources/systems/windows/es_systems.xml b/resources/systems/windows/es_systems.xml
index e9f74d681..dd398ba11 100644
--- a/resources/systems/windows/es_systems.xml
+++ b/resources/systems/windows/es_systems.xml
@@ -1361,8 +1361,8 @@
         <name>ti99</name>
         <fullname>Texas Instruments TI-99</fullname>
         <path>%ROMPATH%\ti99</path>
-        <extension>.7z .7Z .zip .ZIP</extension>
-        <command>PLACEHOLDER %ROM%</command>
+        <extension>.rpk .RPK .7z .7Z .zip .ZIP</extension>
+        <command label="MAME (Standalone)">%HIDEWINDOW% %RUNINBACKGROUND% %STARTDIR%=%EMUDIR% %EMULATOR_MAME% -rompath %ROMPATH%\ti99 ti99_4a -ioport peb -ioport:peb:slot3 speech -cart %BASENAME%</command>
         <platform>ti99</platform>
         <theme>ti99</theme>
     </system>