| MPE Classic | MPE XL/iX | ||||||
| MPE A | ??? | ??? | (Dec 1972) | ||||
| MPE B | ??? | ??? | (Oct 1973) | ||||
| MPE C | ??? | ??? | (Dec 1974) | ||||
| Series I MIT tape | (C.00.05) | R1521 | (May 1975) | ||||
| Series I MIT tape | (C.00.06) | R1525 | (Jun 1974) | ||||
| Series I MIT tape | (C.00.07) | R1531 | (Jul 1975) | ||||
| Series I MIT tape | (C.00.08) | R1537 | (Aug 1975) | ||||
| Series I MIT tape | (C.00.09) | R1543 | (Oct 1975) | ||||
| MPE II Series II MIT tape | (A.00.02) | R1630 | (Jul 1976) | ||||
| MPE II | (A.00.03) | R1634 | (Aug 1976) | ||||
| MPE I | (C.00.13) | R1636 | (Sep 1976) | ||||
| MPE II | (A.00.04) | R1640 | (Oct 1976) | ||||
| MPE I | (C.00.14) | R1646 | (Nov 1976) | ||||
| MPE II | (A.00.05) | R1646 | (Nov 1976) | ||||
| MPE II (Same as A.00.06) | (A.01.00) | R1701 | (Jan 1977) | ||||
| MPE I | (C.00.14) | R1706 | (Feb 1977) | ||||
| MPE I | (C.00.15) | R1709 | (Mar 1977) | ||||
| MPE II | (A.01.01) | R1709 | (Mar 1977) | ||||
| MPE I (PRE-CX,CX,Series I) | (C.00.16) | R1737 | (Sep 1977) | ||||
| MPE II | (A.01.02) | R1737 | (Sep 1977) | ||||
| MPE III | (B.00.00) | ??? | (Jun 1978) | ||||
| MPE C | (C.01.01) | R1830 | (Jul 1978) | ||||
| MPE III | (B.00.01) | R1831 | (Jul 1978) | ||||
| MPE IV (Series 44) | ??? | ??? | (??? 1980) | ||||
| PRE C | (C.00.00) | R2052 | (Dec 1980) | ||||
| C MIT | (C.00.01) | R2101 | (Jan 1981) | ||||
| D MIT | (C.00.02) | R2131 | (Aug 1981) | ||||
| C Delta | (C.00.03) | R2134 | (Aug 1981) | ||||
| MPE IV (Series 40) | ??? | ??? | (Oct 1981) | ||||
| D Delta | (C.00.04) | R2146 | (Nov 1981) | ||||
| Bruno | (C.00.05) | ??? | ??? | ||||
| Cub | (C.00.06) | R2202 | (Jan 1982) | ||||
| Impact | (C.00.08) | R2206 | (Feb 1982) | ||||
| Impact - Resegmented | (D.00.08) | R2206 | (Feb 1982) | ||||
| Ciper | (C.00.20) | R2226 | (Jun 1982) | ||||
| Ciper - Resegmented | (D.00.20) | R2226 | (Jun 1982) | ||||
| Q (Quality) Mit | (C.01.00) | R2244 | (Nov 1982) | ||||
| Q - Resegmented | (D.01.00) | R2244 | (Nov 1982) | ||||
| MPE V (Series 42/48/68) | ??? | ??? | (May 1983) | ||||
| Q Delta 1 | (C.01.01) | R2323 | (Jun 1983) | ||||
| Q Delta 1 Resegmented | (D.01.01) | R2323 | (Jun 1983) | ||||
| Q Delta 2 | (C.01.02) | R2323 | (Jun 1983) | ||||
| Q Delta 2 Resegmented | (D.01.02) | R2323 | (Jun 1983) | ||||
| Q Delta 2 Patch Tape | (C.A1.B2) | R2323 | (Jun 1983) | ||||
| Q Delta 2 Patch Tape Reseg | (D.A1.B2) | R2323 | (Jun 1983) | ||||
| MPE V (Series 68C) | ??? | ??? | (Sep 1983) | ||||
| V/P | (E.00.00) | R2348 | (Nov 1983) | ||||
| V/P reseg | (F.00.00) | R2348 | (Nov 1983) | ||||
| V/E | (G.00.00) | R2412 | (Mar 1984) | ||||
| V/P Delta 1 | (E.00.01) | R2424 | (Jun 1984) | ||||
| V/P Delta 1 Reseg | (F.00.01) | R2424 | (Jun 1984) | ||||
| T-MIT | (G.01.00) | R2448 | (Dec 1984) | ||||
| T-Delta-1 | (G.01.01) | R2510 | (Mar 1985) | ||||
| T-Delta-2 | (G.01.02) | R2531 | (Aug 1985) | ||||
| MPE V (Series 42XP) | ??? | ??? | (Sep 1985) | ||||
| T-Delta-3 | (G.01.03) | R2542 | (Oct 1985) | ||||
| U-MIT | (G.02.00) | R2543 | (Oct 1985) | ||||
| MPE V/R Last MIT for | (E.01.00) | R2548 | (Dec 1985) | ||||
| T-Delta-4 | (G.01.04) | R2607 | (Feb 1986) | ||||
| UA-MIT | (G.02.A0) | R2612 | (Mar 1986) | ||||
| T-Delta-5 | (G.01.05) | R2617 | (Apr 1986) | ||||
| UB-MIT | (G.02.B0) | R2624 | (Jun 1986) | ||||
| T-Delta-6 | (G.01.06) | R2637 | (Sep 1986) | ||||
| MPE V (Micro 3000 RX) | ??? | ??? | (Nov 1986) | ||||
| V-MIT | (G.03.00) | R2713 | (Mar 1987) | ||||
| UB-Delta-3 | (G.02.03) | R2719 | (May 1987) | ||||
| UB-Delta-4 | (G.02.04) | R2731 | (Aug 1987) | ||||
| V Delta-1 | (G.03.01) | R2747 | (Nov 1987) | ||||
| V-Delta-2 | (G.03.02) | R2814 | (Apr 1988) | 3000/XL based on V/E V-Delta 1 (contains all improvements between UB-MIT and V-Delta 1) | (A.10.00) | R2830 | (Jul 1988) |
| V-Delta-3 | (G.03.03) | R2827 | (Jul 1988) | MPE XL 1.1 | (A.10.01) | ??? | (Aug 1988) |
| V-Delta-4 DOD C2 certified | (G.03.04) | R28C2 | (Jan 1988) | XL 1.1 (Patch Tape) | (A.10.17) | R2848 | (Dec 1988) |
| V-Delta-4 (Non C2) | (G.A3.04) | R2840 | (Oct 1988) | XL 1.1 (Patch Tape) | (A.10.A7) | R2907 | (Feb 1989) |
| V-Delta-5 | (G.03.05) | R2902 | (Jan 1989) | MPE XL 1.2 (Core Release) | (A.20.10) | R2915 | (Apr 1989) |
| V-Delta-6 (NOT distributed) | (G.03.06) | --- | --- | XL 1.2 (Production Release) | (A.21.00) | R2926 | (Jul 1989) |
| V-Delta-7 | (G.03.07) | R2927 | (Jul 1989) | XL 1.2 (Production Release) | (A.22.00) | R2935 | (Sep 1989) |
| V-Delta-8 | (G.03.08) | R2944 | (Nov 1989) | MPE XL 2.0 (Core Release) | (A.30.00) | R2943 | (Nov 1989) |
| V-Delta-9 | (G.03.09) | R3010 | (Mar 1990) | XL 1.25 (Production Release) | (A.22.01) | R2950 | (Dec 1989) |
| Platform 1P | (G.1P.00) | R3035 | (Sep 1990) | XL 2.05 (Production Release) | (A.31.00) | R2952 | (Dec 1989) |
| Release 20 | (G.20.00) | R3042 | (Oct 1990) | XL 2.1 (Core Release) | (A.40.00) | R3015 | (Apr 1990) |
| Release 21 | (G.21.00) | R3114 | (Apr 1991) | XL 2.2 (Core Release) | (A.41.00) | R3040 | (Oct 1990) |
| Release 22 | (G.22.00) | R3140 | (Oct 1991) | XL 3.0 (Core Release) | (B.30.00) | R3102 | (Jan 1991) |
| Release 23 | (G.23.00) | R3215 | (Apr 1992) | XL 3.1 (Core Release) | (B.31.00) | R3143 | (Oct 1991) |
| Platform 2P | (G.2P.00) | R3237 | (Sep 1992) | MPE/iX 4.0 (Core Release) | (B.40.00) | R3217 | (Apr 1992) |
| Release 30 | (G.30.00) | R3248 | (Dec 1992) | 4.0 Express 1 | (B.40.02) | ??? | (Sep 1993) |
| Release 31 | (G.31.00) | R3330 | (Jul 1993) | MPE/iX 4.5 (Major Release) | (C.45.00) | R3249 | (Dec 1992) |
| Platform 3P | (G.3P.00) | R3419 | (May 1994) | MPE/iX 5.0 (Major Release) | (X.50.20) | R3404 | (Jan 1994) |
| Release 40 | (G.40.00) | R3531 | (Aug 1995) | 4.0 Express 4 | (B.40.05) | ??? | (Jun 1994) |
| 5.0 Express 1 | (X.50.22) | ??? | (Sep 1994) | ||||
| MPE/iX 5.0 (Core Release) | (C.50.00) | R3504 | (Jan 1995) | ||||
| 5.0 Express 2 | (C.50.02) | R3513 | (Apr 1995) | ||||
| 5.0 Express 3 | (C.50.03) | R3538 | (Sep 1995) | ||||
| MPE/iX 5.5 (Major Release) | (C.55.00) | R3628 | (Jul 1996) | ||||
| 5.5 PowerPatch 1 | (C.55.01) | R3638 | (Sep 1996) | ||||
| 5.5 Express 2 | (C.55.02) | R3715 | (Apr 1997) | ||||
| 5.5 Express 3 | (C.55.03) | R3732 | (Aug 1997) | ||||
| 5.5 Express 4 | (C.55.04) | R3748 | (Dec 1997) | ||||
| 5.5 PowerPatch 5 | (C.55.05) | R3813 | (Mar 1998) | ||||
| MPE/iX 6.0 (Platform Release) | (C.60.00) | R3821 | (May 1998) | ||||
| 5.5 PowerPatch 6 (Bug Fixes only) | (C.55.06) | ??? | ??? | ||||
| 5.5 Express 7 | (C.55.07) | R3910 | (Mar 1999) | ||||
| MPE/iX 6.0 (Platform Release) | (C.60.00) | R3812 | (Mar 1998) | ||||
| 6.0 PowerPatch 1 | (C.60.01) | R3926 | (Jun 1999) | ||||
| MPE/iX 6.5 (Platform Release) | (C.65.00) | ??? | (Mar 2000) | ||||
| 6.5 Express 2 | (C.65.02) | R4046 | (Nov 2000) | ||||
| MPE/iX 7.0 | (C.70.00) | ??? | (Mar 2001) | ||||
| 7.0 Express 1 | (C.70.01) | ??? | ??? | ||||
| MPE/iX 7.5 | (C.75.00) | ??? | (Aug 2002) | ||||