diff --git a/src/devices/bus/isa/aha174x.cpp b/src/devices/bus/isa/aha174x.cpp
index b82888ca73f..06b6ddf5f62 100644
--- a/src/devices/bus/isa/aha174x.cpp
+++ b/src/devices/bus/isa/aha174x.cpp
@@ -135,14 +135,18 @@ ROM_END
 
 ROM_START(aha1742a)
 	ROM_REGION(0x4000, "bios", 0)
-	ROM_SYSTEM_BIOS(0, "v140", "BIOS v1.40")
-	ROMX_LOAD("b_dc00.bin", 0x0000, 0x4000, CRC(056d75ec) SHA1(8ca143adfc7d20ad5d49f14dedabc8276454bf9e), ROM_BIOS(0))
-	ROM_SYSTEM_BIOS(1, "v140s", "BIOS v1.40 (Extended Timeout)")
-	ROMX_LOAD("b_f100.bin", 0x0000, 0x4000, CRC(b695acc0) SHA1(683112fafdf83d5eb89237d9215f7d6eacc6eeaf), ROM_BIOS(1))
+	ROM_DEFAULT_BIOS("v140")
+	ROM_SYSTEM_BIOS(0, "v134", "BIOS v1.34")
+	ROMX_LOAD("adaptec_inc_450214-00_a_bios_8800_1991.u47", 0x0000, 0x4000, CRC(6cf06151) SHA1(0da45634b12b33fc886920d065cc8ffb2cf376b8), ROM_BIOS(0))
+	ROM_SYSTEM_BIOS(1, "v140", "BIOS v1.40")
+	ROMX_LOAD("adaptec_inc_450216-00_a_bios_dc00_1992.u47", 0x0000, 0x4000, CRC(056d75ec) SHA1(8ca143adfc7d20ad5d49f14dedabc8276454bf9e), ROM_BIOS(1))
+	ROM_SYSTEM_BIOS(2, "v140s", "BIOS v1.40 (Extended Timeout)")
+	ROMX_LOAD("b_f100.bin", 0x0000, 0x4000, CRC(b695acc0) SHA1(683112fafdf83d5eb89237d9215f7d6eacc6eeaf), ROM_BIOS(2))
 
 	ROM_REGION16_LE(0x8000, "mcode", 0)
-	ROMX_LOAD("m_b7d6.bin", 0x0000, 0x8000, CRC(0a55a555) SHA1(ff400f56b33f0ad94e34564d7715a0773b335844), ROM_BIOS(0))
-	ROMX_LOAD("m_c7b8.bin", 0x0000, 0x8000, CRC(21282e86) SHA1(18cb3960dc47f2c14beb88f9680c1f66c4652b04), ROM_BIOS(1))
+	ROMX_LOAD("adaptec_inc_450117-00_c_mcode_23a8_1991.u10", 0x0000, 0x8000, NO_DUMP, ROM_BIOS(0))
+	ROMX_LOAD("adaptec_inc_450113-00_d_mcode_b7d6_1992.u10", 0x0000, 0x8000, CRC(0a55a555) SHA1(ff400f56b33f0ad94e34564d7715a0773b335844), ROM_BIOS(1))
+	ROMX_LOAD("m_c7b8.bin", 0x0000, 0x8000, CRC(21282e86) SHA1(18cb3960dc47f2c14beb88f9680c1f66c4652b04), ROM_BIOS(2))
 ROM_END
 
 const tiny_rom_entry *aha1740_device::device_rom_region() const