HardLabs

MZ-700 SD

yanataka60·MZ-700_SD·KiCad/MZ700_SD.kicad_pcb

MZ-700 SD PCB layout, top view — open source AVR/Arduino board by yanataka60

About the MZ-700 SD PCB

MZ-700 SD is an open source AVR/Arduino PCB design by yanataka60, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 100 mm, with 21 components from 15 distinct parts.

Its main chip is the Arduino_Pro_Mini_5V, from the AVR/Arduino family. Other key parts include the 74LS04, 2764, 8255, 74LS30 and GAL16V8. By type, the board carries 7 ICs, 7 capacitors, 5 connectors and 2 switches.

From the project

MZ-700バンク切替対応MZ-80K_SD基板です。MZ-80K_SDも併せて参照ください。

MZ-80KSDはROMをF000Hに置くことでFDコマンドを利用してフロッピーディスク装置の代わりにSD-CARDを繋いでしまおうというものですが、MZ-700でバンク切替によりオールRAMとなったときに、MZ-80KSDのROMがEnableのままなのでMZ-700本体のRAMと両方有効になってしまっています。

実際にS-BASIC等動かしてみるとそのまま問題なく動いているようにも見えるのですが、バンクが切り替わったときにはROMがDisableになったほうが安心です。

MZ-700_SDではバンクが切り替わったときにGAL16V8を使ってROMのDisable、Enableが自動で切り替わります。

~~#### ただし、MZ-80K_SD開発時に使っていたGAL22V10がMZ-80K本体と相性が悪いのかどうにも動作が不安定で泣く泣く汎用ロジックICに置き換えた経験からGALを使っても動作が安定していると確信できるまではテスト公開とします。~~

MZ-700 SD, from the project README
From the project README

Main components on the MZ-700 SD

74LS0427648255Arduino_Pro_Mini_5V74LS30GAL16V8

MZ-700 SD bill of materials (BOM)

21 components, 15 distinct parts.

QtyPartRefs
1
74LS04
U1
1
2764
U2
1
8255
U3
1
Arduino_Pro_Mini_5V
U4
2
74LS30
U5, U6
1
GAL16V8
U7
1
MZ-80K BUS
J1
1
Micro_SD_Card_Kit
J2
1
INT VCC
J3
1
EXT 5V
J4
1
MicroSD Card Adapter
J5
1
INT/EXT
S1
1
SD/CMT
S2
6
0.1uF
C1, C2, C3, C4, C5, C7
1
100uF
C6

MZ-700 SD design files

The KiCad project lives in the yanataka60/MZ-700_SD repository on GitHub; these links point at the commit this page was built from.

MZ-700 SD: common questions

What microcontroller does the MZ-700 SD use?

The MZ-700 SD is built around the Arduino_Pro_Mini_5V, from the AVR/Arduino family.

How big is the MZ-700 SD PCB?

The MZ-700 SD measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MZ-700 SD?

21 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the MZ-700 SD design files?

From the yanataka60/MZ-700_SD repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the MZ-700 SD design in my own project?

Yes, under the terms of its MIT license, which yanataka60 chose for the repository.

Can I test firmware for the MZ-700 SD without the hardware?

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

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