Interesting, many thanks for that photos!
The mechanics are looking as if its a real front-loading drive (unlike the pseudo-front-loading DTL-H2510 drive, which is actually containing a tray with a normal top-loading PSX cdrom drive unit).
The chipset consists of at least four chips... EDIT: No, more than four chips (just noticed that there are more photos at
):
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IC101 100pin SONY CXD2515Q (Signal Processor + Servo Amp) ;#
IC102 28pin BA6297AFP ; on mainboard
ICxx 20pin SONY CXA1571N (RF Amp) (on tiny daughtboard) ; (HCMK-81X)
CN101 21pin connector to DEX2010.SCH board ;
CN10x 12pin connector to KSS-240A (laser pickup) ;
S101 2pin pos0 switch or so? ;
M101 2pin spindle motor ;/
U1 20pin 74ALS244BN ;#
U2 20pin 74ALS244BN ;
U3 20pin 74ALS244BN ; on DEX2010.SCH board
J1 2pin connector to EJECT BUTTON ;
J2 5pin connector to LOADING MOTOR ;
J3 21pin connector to mainboard ;
JP1 40pin external connector to DTL-H2000 ;/
CN151 5pin connector to DEX2010.SCH board ;#
M151 2pin loading motor (eject motor) ; on CDM 14, CMK PSX board
S151 2pin OUT SW ;#switches, probably to ;
S152 2pin IN SW ;/sense load/eject status ;/
CN1 2pin connector to DEX2010.SCH board ;#on DTL-H2010(1) board
SW1 2pin eject button ;/
(assume "#" = backslash; the psxdev.net webpage can't display backslashes at end of line)
The part numbers on the mainboard are all different as in retail consoles:
CXD2515Q: There's no datasheet for that chip, only a small pdf that contains the chip's pinouts - which are almost same as on CXD2545Q chips, only three pins are different: Pin24=ADII (instead of ADIO), Pin25=ADIO (instead of RFC), Pin68=C4M (instead of FSOF). I don't know if any of that pin differences is actually relevant though. Neither of the chips seem to contain support for front-loading drive mechanics. Maybe the CXD2515Q lacks support for SCEx protections. Or maybe there are other/internal differences.
Anyways, assuming that the DTL-H2010 drive is older than PSX retail consoles, it's interesting that Sony did already had the Signal Processor & Servo Amplifier intergrated in a single chip at time when making the DTL-H2010 (whilst in retail consoles, they didn't use such integrated chips on PU-7/PU-8 boards, until they finally invented the CXD2545Q on PU-18 boards).
At software side, the CXD2515Q might actually use the same commands/registers as CXD2545Q (or as the earlier CXA1782BR+CXD2510Q combos, which used similar commands/registers). The DTL-H2000 cdrom firmware EPROM (if it were dumped) should reveal that details.
BA6297AFP: Yet another variant of the BA6398FP, BA6397FP, BA5947FP, AN8732SB 4-channel BTL drivers.
CXA1571N: Another variant of the CXA1791N, CXA2575N-T4 RF-Amplifiers. The way how it is installed (on the daughterboard with 5 wires attached to random spots on the mainboard) looks a bit like patchwork, maybe the DTL-H2010 was originally intended to work without that chip.
