IFN-SC, IFN-SCY (メルコ)

Multi-vendor compatible C bus bus master SCSI I / F. The shape of the SCSI connector is
Amphenol half 50 pin.

The revision of BIOS ROM is 2.13 or later and compatible with Windows 95.Revision of BIOS ROM
IFN update program (for PC-98) even on boards before 2.12 (for Windows 95)
It is possible to make BIOS ROM compatible with Windows 95 by (ifnpc95.exe).Windows 95
So use the driver for PC-9801-55 (Melco officially specified).
Bus master transfer can be used with the main unit equipped with 16 MB or more of protected memory.

I have created a BIOS ROM 2.13 using e10chk.exe, a free software created by Mr. Marimo
I checked about the upper limit of recognition capacity of this board, but it is not 8GB correspondence (1GB has a wall?)
The result was obtained.HDD parameter automatic analysis program v. 1.03 is also I / O data
IDE-to-SCSI conversion board HDX-SC-3 IOD1A067 (built in 40GB external HDD) +
The Seagate ST3642A (6.4GB, without division with FAT32) was misrecognized as having a capacity of 2014 MB.

For interrupt level, DMA channel, transfer method, etc., select [CTRL] + [GRAPH] + [S].
SCSI board activated by power ON or reset switch ON while holding down
Set by the setting utility.

Transfer method is using PC-9801T and CPU accelerator + internal expansion memory together
Select I / O transfer mode for PC-9801 RX.
The HDD parameter automatic analysis program displays the screen after turning on or resetting the main unit power.
In the upper left
MELCO SCSI SYSTEM Ver.X.xx XX / XX / XX
Connect ID = 0 1 2 ...
When the character string is displayed, press [CTRL] + [GRAPH] + [P] to start.This is an analysis
Use the supplied HDPARA.EXE for parameter analysis of hard disk drives.

8 series dip switches, 2x4 series jumper switches, 2x2 series jumpers on the board
There are 1 switch each and 2 jumper switches.
Below, in order of the PC main body ■ slot that can be installed:
　PC-9801VX0 / VX2 / VX4 # 2, # 3, # 4
　PC-98 XA # 3 and # 5
　PC-9801UF / CV # 2
　PC-286LS (T) / 386LS (C / X) # 2 (left side seen from the back)
　Other than above ■ Any slot can be installed
　※ Not compatible with PC-98DO / DO + and PC-386LSR.

・ 8 stations dip switch SW1: BIOS valid / invalid, main unit model, BIOS address setting
1: SCSI ROM BIOS enable / disable setting
　ON BIOS enabled (factory setting)
　OFF ■ BIOS disabled
　When using with BIOS enabled, use the I / O port address with the factory settings.
2-3: Setting of machine type
　ON-ON 80286/386/486 / Pentium based machine (VX or later) (factory setting)
　ON-OFF ■ normal · high res combined use machine
　OFF-ON ■ 8086 / V30 loading machine
　OFF-OFF PC-98XA
4-5: BIOS address setting in high resolution mode
　ON-ON 0EE000h to 0EEFFFh
　ON-OFF 0EC 000h to 0ECFFFh (factory setting)
　OFF-ON 0EA 000h to 0EAFFFh
　OFF-OFF 0E8000h to 0E8FFFh    
6-7-8: BIOS address setting in normal mode
　ON-ON-ON 0DE 000h to 0DEFFFh   
　ON-ON-OFF 0DC 000h to 0DCFFFh (factory setting)
　ON-OFF-ON ■ 0DA 000 h to 0 DAFFF h
　ON-OFF-OFF 0D 8000 h to 0 D 8 F FF h
　OFF-ON-ON 0D6000h to 0D6FFFh
　OFF-ON-OFF 0D4000h to 0D4FFFh
　OFF-OFF-ON 0D 2000h to 0D2FFFh
　OFF-OFF-OFF 0D0000h to 0D0FFFh

・ 2x4 jumper switch JP1: Selection of bus request channel
　1-8, 2-7 short / 3-6, 4-5 open Hold request channel 1
　1-8, 2-7 open / 3-6, 4-5 short ■ Hold request channel 2
　　　　　　　　　　　　　　　　　　                (Factory setting)
・ 2x2 jumper switch JP2: I / O port address setting

　1-4, 2-3 open ■ 0 CF 0 h, 0 CF 2 h, 0 CF 4 h, 0 CF 6 h
　1-4 short, 2-3 open ■ 0CE0h, 0CE 2h, 0CE 4h, 0CE 6h
　1-4 open, 2-3 short ■ 0 CD 0 h, 0 CD 2 h, 0 CD 4 h, 0 CD 6 h
　1-4, 2-3 short ■ 0 CC 0 h, 0 CC 2 h, 0 CC 4 h, 0 CC 6 h (factory setting)

・ 2 jumper switch JP4: SCSI bus signal "TERMPWR", normally open
Used in (factory setting) (power supply to active terminator on board
  Would be a setting jumper)
※ Normally, use the same jumper settings for each jumper switch.