Infinity Sound Driver
|Infinity Sound Driver|
The Infinity Sound Driver is a sound driver created by the Infinity company for their games released on the X68000 and PC-9801 Japanese computer lines. Although the first releases of the driver are dated 1989, some of the copyrights use a date of 1986. However, this is probably the date the Infinity began as a company, not when they wrote the driver. The last updated driver carries a date of 1992. For the X68000, the driver program is named OPMDRV.X, and for the PC-9801, it is named OPNDRV.COM. Music files are stored with a .BIN extension, however, to more easily identify their format, the files should be given an .INF extension when uploaded to the VGMPF.
While details about the driver are unknown, it was probably programmed in 8086 assembly, possibly by Kazuo Sawa who is credited as the musician for nearly every game that uses this driver, and wrote several audio drivers in his career.
There are four verified versions of the driver, 1.00, 1.10, 2.00 and 2.10 which can be found at the beginning and end of the OPMDRV.X and OPNDRV.COM files. In the OPNDRV builds, the version number at the end of the file always matches the number at the top, but, at the end of the OPMDRV.X files, a version number of 0.80 is always listed. This may have been a beta version number that was created during testing and never updated in subsequent OPMDRV builds.
The version numbers are not entirely sequential, but rather all version 1 releases are for the X68000 and all version 2 releases are for the PC-9801. However, increases in the decimal value do indicate a later version.
Those versions labeled "revision" use the same version number but include later copyright dates. They are definitely new builds of the program, but it is unknown if the driver changed at all.
|1989-??-??||0.80 (possible beta version)|
|1989-11-21||Ultima III: Exodus (PC98)||
|1990-03-16||Populous (PC98)||Version 2.10|
|1990-07-21||Ultima V: Warriors of Destiny (PC98)||Version 2.00|
|1990-07-21||Ultima V: Warriors of Destiny (X68)||Version 1.00|
|1991-10-25||Powermonger (PC98)||Version 2.10|
|1991-10-25||Powermonger (X68)||Version 1.10|
|1992-08-28||Populous II: Trials of the Olympian Gods (X68)||Version 1.10 Revision|
|1993-02-05||Populous II: Trials of the Olympian Gods (PC98)||Version 2.10 Revision|
Need to check the following games:
- Ultima III: Exodus (PC88)
- Ultima III: Exodus (X1)
- Ultima V: Warriors of Destiny (PC88)