Editing DVRP

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In the PSX, it handles HDD access and DRM/security functions. Little is known about it at the time, and it could be a target for efforts to make generic hard drives work in the PSX.
In the PSX, it handles HDD access and DRM/security functions. Little is known about it at the time, and it could be a target for efforts to make generic hard drives work in the PSX.


The MB91302A could optionally be ordered with 4 KB custom built-in Mask-ROM content, which is what Sony did for the PSX (Chip identifier is MB91302A-103; -001 would be without ROM, -010 would be with a Fujitsu real time OS (SOFTUNE REALOS/FR) in ROM, -020 would be with a Fujitsu IPL in ROM). Despite having custom Mask-ROM content, it still most likely runs a variant of SOFTUNE REALOS, as the firmware contains strings which indicate this.
The MB91302A could optionally be ordered with 4 KB custom built-in Mask-ROM content, which is what Sony did for the PSX (Chip identifier is MB91302A-103; -001 would be without ROM, -010 would be with a Fujitsu real time OS (SOFTUNE REALOS/FR) in ROM, -020 would be with a Fujitsu IPL in ROM). Despitehaving custom Mask-ROM content, it still most likely runs a variant of SOFTUNE REALOS, as the firmware contains strings which indicate this.


[https://twitter.com/DiscoStarslayer/status/1628628484003139584 In February 2023, the Mask-ROM has been successfully dumped.] This also revealed some kind of recovery mode of DVRP.
[https://twitter.com/DiscoStarslayer/status/1628628484003139584 In February 2023, the Mask-ROM has been successfully dumped.] This also revealed some kind of recovery mode of DVRP.
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