PC98M29C (Caravelle) Use HDD pack for old 98 notes (NS / E, Ne3 etc.) in C bus slot Adapter for (C bus board).Attach not IDE to SCSI conversion board The HDD that has been created is recognized as an IDE HDD.There is no character of PC98M29C on the board, PC98M29A on the main board, daughter board (connector with HDD pack) There is PC98M29B silk print on the top.ROM address is D8000h to D9FFFh, work RAM addresses for DA000h to DBFFFh.The I / O port address is 064xh, 074xh, 0 CFxh (x = 0, 2, 4, 6, 8, A, C, E). A case sold as a single board and an HDD pack made by Caravelle are attached It seems that there were cases where it was sold in the The theory that only HDDs with the capacity installed can be recognized (Note 1) Unconfirmed.Although the format upper limit and recognition upper limit are unknown, The author has confirmed that it can be used up to 540 MB properly.Also below this In terms of capacity, Windows 95 can be used without problems (Notes 2 and 3). Note 1: There is a story that the position of the chip resistance on the board is changed to perform capacity limitation. 　　 There is, but it is hard to think as long as you look at the substrate. Note 2: But 540 MB HDD [I • O data, HDN-540M: Fujitsu MK1924FCV, 　　In the case of 543 MB (Cyl 1053, H 16, S 63)], the HDB 98 (ver .1.20, on MS-DOS) 　　The capacity is misrecognized in Marimo's work) (Model: PC-9821As2 / U2 + DX2 ODP): IDE connection disk Built-in 1 80h Total capacity 203 (MB) 3059/8/17 Grain size: 32768 16384 8192 4096 2048 1024 512 (B) -------------------------------------------------------- ------------------------- Speed (top): 1080 1050 1000 913 771 585 398 (KB / sec) Speed (end): 1080 1060 1000 914 771 585 398 (KB / sec) Seek time: 3211 points. Note 3: READ / WRITE for HDBENCH (ver. 2.610 / 3.30, EP82 revised / created by Windows) on Windows 95 　 　The value may show an abnormal value. There are 8 series dip switches and 2 jumper switches on the board. ・ 8 stations dip switch SW1: Setting of main unit model 1-2-3-4-5-6: Always OFF-ON-ON-ON-ON-ON 7: Setting of machine type 　Models with ON = 80286 or more 　Model of OFF = V30 8: Always on ・ 2 jumper switch JP1: Setting of main unit clock 　Other than short = 12 MHz 　Open = 12 MHz 　※ But it seems to work open even in VX21 (10 MHz).