| Restoration comments May/2018 | |
| Internal Translator (IT Compiler) | |
| From Bitsavers Manual CarnegieInternalTranslator.pdf | |
| The run_it.ini script uses P1 run-time package that | |
| provides floating point +,-,/,* PUNCH and READ, that's | |
| all. In particular, it does not provides power functions | |
| so using power operator in IT program will crash the | |
| object program in run-time. | |
| To allow the use of IT power operator, replace _P1 | |
| package by _P2, _P3 or _P4 (depending on what is needed) | |
| In the original listing found in manual, some opcodes has | |
| a different name of the standard SOAP II ones. | |
| They have been changed to regular SOAP names | |
| Mnemonic in Standard SOAP | |
| original listing equivalent mnemonic | |
| AAB -> AML | |
| SAB -> SML | |
| NZA -> NZE | |
| RAB -> RAM | |
| RSB -> RSM | |
| RDS -> RD1 | |
| IT compiler generates also these opcodes in object | |
| program, to be assembled by IT modified y SOAP I. As | |
| SOAP I is not available, the IT compiler has been | |
| modified to produce standard SOAP II opcodes. | |
| These modifications are done in lines 394-410, file | |
| it_compiler_listing.txt with a comment to signal it. | |
| Also all the correction to the listing stated in the | |
| manual has been applied. They are stated at the | |
| end of it_compiler_listing.txt file. | |
| Original listing in manual describes the modifications | |
| to apply to standard SOAP I deck in order to assemble | |
| IT compiler produced SOAP code (soap_patch_listing.txt). | |
| As SOAP I is not available, an equivalent set of modifications | |
| has been written to be applies to SOAP II in order to | |
| allow to assemble IT produced compiled code (soapII_patch.txt) | |
| Floating point numbers are encoded as | |
| 2300000049 = 0.23 | |
| 1000000050 = 1.0 | |
| 1500000052 = 150.0 | |