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ZX Diagnostic 2021

tebl·ZX-Interface-2.021·ZX Diagnostic 2021/ZX Diagnostic 2021.kicad_pcb

ZX Diagnostic 2021 PCB layout, top view — open source board by tebl

About the ZX Diagnostic 2021 PCB

ZX Diagnostic 2021 is an open source PCB design by tebl, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 57.9 × 61.6 mm, with 29 components from 18 distinct parts.

Other key parts include the 27C512 and 74HCT374. By type, the board carries 9 resistors, 8 diodes, 4 modules, 3 jumpers, 2 ICs and 2 capacitors.

It belongs with the test & measurement designs in this gallery.

From the project

An old-school remake of the ZX Interface 2 with some modern tweaks - mainly by integrating bank switching into the interface itself. Everything done with basic logic chips and components, no magic black boxes to be found anywhere!

The rest of the functionality needed to serve as a diagnostic cartridge has been added to the ZX Diagnostic 2.021, apart from being a 16K cartridge there is an 8bit latch that will be used to output diagnostic status to the LEDs. The LEDs will allow some additional feedback to show that the computer is somewhat functional, even when there there is no image. Compared to the ZX Cartridge 2.021, this only supports a single ROM chip with sizes ranging ranging from 27C128 up to 27C512.

ZX Diagnostic 2021, from the project README
From the project README

Main components on the ZX Diagnostic 2021

27C51274HCT374

ZX Diagnostic 2021 bill of materials (BOM)

29 components, 18 distinct parts.

QtyPartRefs
1
27C512
U1
1
74HCT374
U2
4
Mounting
M1, M2, M3, M4
1
Cartridge
J1
1
A15
JP1
1
A14
JP2
1
LED_EN
JP3
1
LED0
D1
1
LED1
D2
1
LED2
D3
1
LED3
D4
1
LED4
D5
1
LED5
D6
1
LED6
D7
1
LED7
D8
2
100nF
C1, C2
8
330
R1, R2, R3, R4, R5, R6, R7, R8
1
10k
R9

ZX Diagnostic 2021 design files

The KiCad project lives in the tebl/ZX-Interface-2.021 repository on GitHub; these links point at the commit this page was built from.

ZX Diagnostic 2021: common questions

How big is the ZX Diagnostic 2021 PCB?

The ZX Diagnostic 2021 measures 57.9 × 61.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ZX Diagnostic 2021?

29 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the ZX Diagnostic 2021 design files?

From the tebl/ZX-Interface-2.021 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the ZX Diagnostic 2021 design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which tebl chose for the repository.

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