diff --git a/src/devices/bus/ti99/gromport/cartridges.cpp b/src/devices/bus/ti99/gromport/cartridges.cpp
index e116d00b6e9..7e93029f97f 100644
--- a/src/devices/bus/ti99/gromport/cartridges.cpp
+++ b/src/devices/bus/ti99/gromport/cartridges.cpp
@@ -138,6 +138,7 @@ void ti99_cartridge_device::prepare_cartridge()
 	m_pcb->m_rom_size = loaded_through_softlist() ? get_software_region_length("rom") : m_rpk->get_resource_length("rom_socket");
 	if (m_pcb->m_rom_size > 0)
 	{
+		if (m_pcb->m_rom_size > 0x200000) fatalerror("Cartridge ROM size exceeding 2 MiB");
 		LOGMASKED(LOG_CONFIG, "rom size=0x%04x\n", m_pcb->m_rom_size);
 		regr = memregion(CARTROM_TAG);
 		rom_ptr = loaded_through_softlist() ? get_software_region("rom") : m_rpk->get_contents_of_socket("rom_socket");