MSX YM2149 Game Module

Experience retro sounds with the YM2149 sound and controller module. This module provides MSX-compatible sound and controller support (joysticks, game pads, etc.) for your RC2014 system. It is also compatible with RomWBW sound applications.

Features

• YM2149 PSG - 3 channel audio, +1 noise channel
• 2 Controller Inputs (joystick, game-pad, and other input types) - MSX compatible
• optional additional audio input lines, for mixing into the audio out.

Bill of Materials

Count	Name	Designator
4	10uF	C10,C13,C12,C11
6	0.1uF	C3,C8,C1,C5,C4,C2
2	33pF	C7,C6
8	1N4148	D8,D5,D7,D6,D4,D3,D2,D1
1	400mA Fuse	F1
1	AUD-OUT	H1
1	KYB-TYPE	J1
1	BUS-MAP	J2
1	JOYSTICK-A	JY1
1	JOYSTICK-B	JY2
1	ACTIVE	LED1
1	3.5 Audio Socket	P1
1	10k Ω Bussed x 12	R1
3	4k7 Ω	R10,R11,R4
2	10k Ω	R2,R12
1	470 Ω	R3
1	1M Ω	R5
1	330 Ω	R6
1	2k2 Ω	R7
1	20k Ω	R9
1	74HCT138	U1
1	YM2149	U2
1	74HC00	U3
1	74LS07	U4
2	74HCT157	U6,U5
1	3.579545MHz	X1
1	Right Angle 20x2 Header	B1
1	Right Angle header 1x20	B1
2	14 POS IC SOCKET
3	16 POS IC SOCKET
1	40 POS IC SOCKET

Operation

CP/M Sample Apps for RomWBW

The tune.com cp/m distributed with RomWBW works just fine with the board.

Port Mapping

Standard MSX port mapping.

Port	range	Description
#A0	(write)	Register write port
#A1	(write)	Value write port
#A2	(read)	Value read port

The following table describes the registers of the PSG:

Register(s)	Description
0-5	Tone generator control
6	Noise generator control
7	Mixer control-I/O enable. Important note: bit 6 must be 0, and bit 7 must be 1.
8-10	Amplitude control
11-13	Envelope generator control
14-15	I/O ports A & B

Images

Assembled

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Kit

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PCB topside

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PCB underside

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Schematic

• Schematic: schematic.pdf

Disclaimer

Please note that this is a kit, produced by a non-expert (me) for hackers, DIYers’ and retro lovers, to tinker with. Please exercise caution and follow good safety practices. You will be working with sharp knives, a hot soldering iron, and small metal components. Be mindful of the risks involved in the build process. I will do my best to answer any questions you may have.

This kit is provided as-is, with no guarantees or warranties. By assembling and using this kit, you acknowledge that you do so at your own risk.