Msx pulse

tarinaroope·msx-pulse·hardware/msxdoc_proto.kicad_pcb

About the Msx pulse PCB

Msx pulse is an open source RP2040/RP2350 PCB design by tarinaroope, published on GitHub under the MIT license. It is a 2-layer board measuring 99.9 × 127.5 mm, with 69 components from 32 distinct parts.

Its main chip is the RP2354B, from the RP2040/RP2350 family. Other key parts include the AP2112K-3.3 and 74LVC245. By type, the board carries 24 resistors, 23 capacitors, 6 ICs, 4 connectors, 4 switches and 4 diodes.

It belongs with the retro computing designs in this gallery.

From the project

A diagnostic cartridge for MSX computers. Very much a work in progress. This is at proof-of-concept stage. It boots, it reads the bus, it tells you things, but it's a long way from a finished product. I'm building it partly because I wanted an "is this MSX dead, and if so why" to

Plug it into the cartridge slot and it sits there passively. It doesn't drive the bus, so it's safe to leave in while the MSX powers up on its own. While it watches, it reports on a small OLED:

Main components on the Msx pulse

AP2112K-3.3 RP2354B 74LVC245

Msx pulse bill of materials (BOM)

69 components, 32 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	AP2112K-3.3	SOT-23-5	U1
1	RP2354B RP2350B	QFN-80-1EP_10x10mm_P0.4mm_EP3.4x3.4mm_ThermalVias	U2
4	74LVC245 SN74LVC245APW	TSSOP-20_4.4x6.5mm_P0.65mm	U3, U4, U5, U6
1	2N7002	SOT-23	Q1
1	12MHz	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	Conn_01x50	MSX-EDGE	J1
1	HS96L03W2C03 HS(汉昇)	OLED-TH_L27.8-W27.2-P2.54_C9900033791	J2
1	GT-USB-7010ASV G-Switch(品赞)	USB-C-SMD_G-SWITCH_GT-USB-7010ASV	J3
1	Conn_01x03_Pin	PinHeader_1x03_P1.27mm_Vertical_SMD_Pin1Right	J4
4	K2-1102AQ-C4CW-01 韩国韩荣	SW-TH_K2-1102AQ-C4CW-01	SW1, SW2, SW3, SW4
1	LED	LED_0603_1608Metric	LED1
1	BAT54C	SOT-23	D1
3	BZX84-C3V3 BZX84Cxx	SOT-23	D2, D3, D4
1	AOTA-B201610S3R3-101-T 3.3u ABRACON	IND-SMD_L2.0-W1.6_AOTA-B201610S3R3-101-T	L1
1	1uf	C_0603_1608Metric	C1
1	10uf	C_0603_1608Metric	C2
2	100nf	C_0603_1608Metric	C3, C6
2	15pf	C_0603_1608Metric	C4, C5
12	100nF	C_0402_1005Metric	C7, C8, C9, C10, C11, C12, C13, C14 +4
4	4.7uF	C_0402_1005Metric	C18, C19, C20, C22

Show 12 more

Qty	Part	Footprint	Refs
1	1uF	C_0402_1005Metric	C24
2	10k	R_0603_1608Metric	R1, R2
1	33	R_0603_1608Metric	R3
2	330R	R_0603_1608Metric	R4, R23
2	4.7kR	R_0603_1608Metric	R5, R6
2	5.1kR	R_0603_1608Metric	R7, R8
5	1kR	R_0603_1608Metric	R9, R15, R18, R19, R21
4	10kR	R_0603_1608Metric	R10, R11, R13, R16
1	33kR	R_0603_1608Metric	R12
2	33R	R_0603_1608Metric	R14, R24
1	82kR	R_0603_1608Metric	R17
2	27R	R_0603_1608Metric	R20, R22

Msx pulse design files

The KiCad project lives in the tarinaroope/msx-pulse repository on GitHub; these links point at the commit this page was built from.

Layouthardware/msxdoc_proto.kicad_pcb
Schematichardware/msxdoc_proto.kicad_sch
BOMdocs/BOM.csv

Msx pulse: common questions

What microcontroller does the Msx pulse use?

The Msx pulse is built around the RP2354B, from the RP2040/RP2350 family.

How big is the Msx pulse PCB?

The Msx pulse measures 99.9 × 127.5 mm, has 2 copper layers and is 1.600198 mm thick.

How many components are on the Msx pulse?

69 components, from 32 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Msx pulse design files?

From the tarinaroope/msx-pulse repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Msx pulse design in my own project?

Yes, under the terms of its MIT license, which tarinaroope chose for the repository.

Can I test firmware for the Msx pulse without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.