The 1227727 is an underhood/weatherproof version of the 1227730. ECM pinouts are different but calibrations are the same. Applications were post '89 pre LT-1 TPI V8s. ie 91-92 vette (1227727), 91-93 F body (1227730). Also 2.8/3.1 PFI V6 applications, and 2.0 TBI L4.
.ecu files describe the layout of tables and data items in a PROM image. There are several image editing programs that use .ecu files in conjunction with .bin files to allow you to edit the tables in a prom image in real world units rather than hex. Promedit and Winbin are two examples.
| filename | Mask ID |
| 1227730_8d.ecu | $8d |
| 730_atta.ecu | $88 |
Prom images are listed by broadcast code, which uniquely identifies the application of the Prom (Engine, transmission, rear end, ECM, etc.)
| Broadcast code (BCC) | Mask ID | Application |
| AUJP1350 | ??? | 90-92 V8 TPI, 1227730 |
| Another aujp bin | ||
| AUJMV | ??? | '89 5.7L TPI Camaro automatic |
| BAFL | ??? | '93 LT1 TPI Camaro automatic |
| AZTY | ??? | '92 3.1L MPFI Camaro "T" |
| AMAS7004 | ??? | 2.8L Auto |
| ASMJ0692 | ??? | 88 Beretta/2.8L/Speed Density |
| ADRY2642 | ??? | 87 Cim/2.8L/DigDash/Non-SD |
| ADRY3193 | ??? | 87 Cim/2.8L/DigDash/Non-SD |
| ARDC4468 | ??? | 88 Cim/2.8L/DigDash/Speed Density |
| ADRR3163 | ??? | 87 Corsica/Beretta 2.8, 3spd auto, Federal emissions, 3.18:1 final drive, without Z21 |
| BCC | filename | description |
| AZTY1407 | azty_hac.dsm | '92 3.1L Camaro |
'92 F body 5.0 and 5.7:
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'87 2.0 L4 TBI "1" LL8:
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'87-'89 2.8 V6 PFI "W" LB6:
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'90 5.7 V8 PFI "8" L98 (1227727/Corvette):
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'89 Pontiac Grand Prix turbo 3.1L V6 PFI LG5 "V" (1227727)
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