NEC PC-9801-86 Sound board

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NEC PC-9801-86 Sound board

NEC PC-9801-86
Retail price	25,000 yen
Manufacturer	NEC
Available date	1993 - 1996 (?)
System requirement	NEC PC-9800 series with CPU faster than 80286 10 MHz
Supported OS	MS-DOS 5.0 and later
	OS/2 Warp V3, V4
	Windows 3.1, 95, 98, NT 3.5, 3.51, 4.0
Features	Yamaha YM2608 FM synth (no ADPCM support)
	PCM recording & playing (max 44.1 kHz / 16 bit / 2 ch)
I/O panel	Mic Input (1 ch)
	Line Input (2 ch)
	Mini jack out 2 x 2 ch
	DC 12 V Power Input
Contents	Sound board
	2 x Stereo audio cables
	Microphone (PC-9821A-U01)
	AV Sound Driver Disk (5.25" FD x 1、3.5" FD x 1)
	Users manual
Notes	If all other slots use +12V, ext DC power supply is required.

According to S/N, this board was made in August 1996. PCB number (?) is G8NQY. (Note: First digit of S/N means the last digit of manufactured year, and the second means its month, but X = October, Y = November, Z = December)

The PC-9801-86, often called "86 board" (86ボード) or "86 sound" (86音源), came out in 1993. It has Yamaha's YM2608 (OPNA) FM synth chip, PCM sound buffers (often called "86PCM") and a compatiblity with its predecessor standard "PC-9801-26K". PC98 gamers should own it because most PC98 DOS games support it. As of 2016, the 86 board is priced at $70 - $100 at Yahoo Japan auction. PC-9821Ap, As, Ae, Ce, Af, Ap2, As2, Cs2, Ce2 and An integrated these features into those motherboard.

1. Three-terminal regulator for the external power supply (PC-9801-73-AC).
2. 8 positions DIP switches to configure hardware resources.
3. NEC 128KB ROM? - Same BIOS ROM as PC-9801-26K, both are used for N88-BASIC(86).
4. Bus controller IC
5. YAMAHA YM3433B - PCM data/channel separater.
6. Burr-Brown PCM61P x 2 - 18 bit D/A converter for PCM sound.
7. NEC uPC1406HA x 6 - Controlling sound volumes.
8. Oki 32KB DRAM - FIFO buffers for PCM playing.
9. FM Synthesizer chip

Bottom

Panel

YAMAHA YM2608(OPNA)

The connector marked as "CN9 AGING" is a test plug. This is not an audio line. The PSG sound is played through the Pin 27 of the YM2608 chip, and then mixed with the FM sound in the analog circuit. So, some compatible boards play FM / PSG sounds with a different volume.

A normal 86 board is a bit noisy. I tried Yasuma's modification, and it became noiseless and dynamic sound which is better than PC98 emulator's. (Put 16V/22uF capacitor between Pin 1 and 2 of YM3016, remove XRU4066BF chip and bypass two lines.)

DAC at PCM circuit (Burr-Brown PCM61P, Dynamic range 108dB)

Accessories

Driver disks

Compatible boards from third parties:

Idle Japan Super Sound 10 アイドルジャパン スーパーサウンド10(SS-10)	?	19,800 yen	"PC-9801-26K" compatible (OPN), RCA-out 2ch x 1, Mini jack out 2ch x 1, On-board speaker x 1, JOYSTICK x 2
Idle Japan Speak Board アイドルジャパン スピークボード(SP-26)	1991?	49,800 yen	"PC-9801-73" FM only compatible(OPNA, ADPCM), ADPCM rec&play (max. 32KHz/8bit/2ch), RCA-in 2ch x 1, RCA-out 2ch(+1ch), JOYSTICK x 1
Qvision WaveMaster	Jun.1995	26,800 yen	"PC-9801-86" fully compatible(OPNA + PCM) + SCSI I/F, Mic input, Line input (2ch)、Mini jack out 2ch x 1、 JOYSTICK x 1、SCSI port x 1
Qvision MidiMaster	Jun.1995	12,800 yen	Optional daughter board for WaveMaster. It contains OPL4 FM synthesizer, supports GM MIDI.

The PC-9801-73 came out in 1991, two years before the 86 board. It had a YM2608 FM synth, ADPCM sound buffers, PCM sound buffers and a DSP chip with 4 audio channel outputs. It was unpopular due to its high price. The 86 board didn't have a fully compatibility with the 73 board, but you won't be in trouble because most applications use it as the 86 board.

Advert of Speak Board and Super Sound 10.

Dip switch settings (O=Open (Off), X=Closed (On))

8 positions dip switch

1 : I/O port address
2 : Use sound BIOS ROM
3,4 : Interrupt level
5 : Use interrupt
6-8 : Sound Function ID

SW	説明	状態	設定
1	I/O port address	O	288h-28Eh
		X	188h-18Eh
2	Use sound BIOS	O	Disabled (Not allocate)
		X	Enabled (CC000h)
3,4	Interrupt level	OO	INT0 (IRQ3)
		XO	INT4 (IRQ10)
		XX	INT5 (IRQ12)
		OX	INT6 (IRQ13)
5	Use interrupt	O	Disabled
		X	Enabled
6,7,8	Sound Function ID (SW1=X : 4, SW1=O : 5)	XXX	0(PC-98DO+)
		OXX	1(PC-98GS)
		XOX	2(PC-9801-73,188h)
		OOX	3(PC-9801-73,288h)
		XXO	4(PC-9801-86,188h)
		OXO	5(PC-9801-86,288h)
		XOO	6(PC-9821Nf/Np)
		OOO	7(Mate-X PCM)

Default setting : XXXXXXXO

You shouldn't change these settings except avoiding resource conflicts. The Sound Function ID is only refered to by applications, so it doesn't mean you can change the function of the board. The PC-9821Xn released in September 1994 and late machines have the WSS-PCM that is not compatible with the 86 board. It causes resource conflicts. When you use the 86 board on these machines, you must disable the WSS-PCM by using the System Setup Menu. Refer to System Setup Menu [NEC PC98].

Sound drivers

Software	Date	How to get its device driver
N88-BASIC(86),N88-日本語BASIC(86)	-	Use Sound ROM (26K compatible only)
N88-日本語BASIC(86)(MS-DOS版)(Ver6.1)マルチメディア対応	1991/11	Supported by default.
N88-日本語BASIC(86)(MS-DOS版)(Ver6.2)	1994/01
日本語MS-Windows(Ver.3.0)	1991/02	Driver disk was sold separately.
日本語MS-Windows(Ver.3.0A)	1991/12
日本語MS-DOS(Ver5.0)	1991/11	Driver disk comes with the board.
日本語MS-DOS(Ver5.0A)	1992/11
日本語MS-DOS(Ver5.0A-H)	-	Included in the operating system.
日本語MS-Windows(Ver.3.0A-H)	-
日本語MS-Windows(Ver.3.0B)	1993/02
Microsoft Windows 3.1	1993/05
MS-DOS 6.2	1994/12
OS/2 Warp V3 日本語版	1994/12
OS/2 Warp V4 日本語版	1996/12
Microsoft Windows NT Workstation 3.5	1994/12
Microsoft Windows NT Workstation 3.51	1995/11
Microsoft Windows NT Workstation 4.0	1996/12
Microsoft Windows 95	1995/10
Microsoft Windows 98	1998/06
Microsoft Windows 98 Second Edition	1999/08

Many PC98 DOS games didn't use NEC's driver (AVSDRV.SYS) because better shareware and freeware drivers already exist before it came. Usually, the driver is bundled with the software, so you don't have to do anything.

Popular sound drivers:

• FMP
  FM sound driver & player
  http://www.vector.co.jp/soft/dos/art/se003498.html
• PPZ8
  PCM sound driver working with FMP
  http://www.vector.co.jp/soft/dos/art/se022226.html
• PMD (PMD98)
  FM sound driver & player
  http://www5.airnet.ne.jp/kajapon/tool.html (Full set includes MML compiler)
  Other source: http://www.vector.co.jp/soft/dos/art/se015682.html

Related pages

• NEC PC-9801-26K Sound Board

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Update : 2016/11/10

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