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

Kit

PCB topside

PCB underside

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. The creator cannot be held responsible for any damage, injury, or loss that may occur during the assembly or operation of this kit.