MoonCat,
Есть такая приблуда PS2 700XX serials SATA HDL installation kit
Инфа вот здесь
https://www.maxdiypower.com/index.php?gOo=goods_details.dwt&goodsid=128&productname= The SATA Hard Drive Connection Tool is a revolutionary product for your 700XX PSTwo. The HD Connect is an innovative HD 'connector' allowing you to connect an SATA hard drive for use with the PSTwo 700XX Slimline. This is the only way to connect an SATA hard drive to your PStwo slimline. There are various USB solutions but the HD Connect offers a faster data transfer time. Currently the HD Connect requires the use of DMS4 Pro type chip with a compatible BIOS OS.
Now, with the use of HD Connect, you can simply load original, purchased games onto an attached PS2 hard disk, and then run the original, purchased game later on from there. Faster loading, no need to mess with original game disks etc. A must have for all PSTwo Slimline users! Ever wanted to load your original, purchased PS2 games onto your hard drive and then run them without the hassle of swapping discs? Ever been annoyed by the extremely long loading times while reading data from an original, purchased game disc? HD Connect solves these problems and does
so much more. HD Connect makes gaming more convenient by allowing you to store your original, purchased games on an attached hard disk drive, eliminating the need to change discs each time you wish to play a different game.
Support PS2 700xx serials only.
Я думаю всем пользователем slim-PS2 будут интересны результаты твоих экспериментов с этой железкой 
PS Вот ветка на Psx-scene.com
https://psx-scene.com/forums/ide-hdd-discussion/60119-new-ps2-700xx-serials-sata-hdl-installation-kit.html
!!! Обратите внимание, что адаптер совместим только с 700XX серией!!!
