The ZX Diag Cart will visually show all kinds of details of your ZX Spectrum, which is both looking cool and useful at the same time!
It will make diagnosing defects a lot easier:
Quickly check if voltages are present
If there is a data line ‘stuck’
If the M1 line is working…
If you are thinking of repairing your own ZX Spectrum (any model, including many clones), this is the tool you must have!
The kit contains:
The circuit board with SMD parts already assembled
All parts in separately labelled bags with their part numbers for easy matching
IC’s and sockets on anti-static foam
The manual and DIY build guide
AUTODETECTION OF ZX SPECTRUM MODEL
The ZX Diag Cart automatically detects to which ZX Spectrum model it is connected, so it can control the ROM signals on ZX Spectrum 16/48K, 128K+, +2, +2A or +3, and many clones.
The ZX Diag Cart has 20 LEDs showing these groups of information:
– Control signals status, indicated by the blue LEDs
– Data lines status, indicated by the red LEDs
– Power lines status, indicated by the green LEDs
The speed of change of the LEDs is limited by a clever timing circuit, so it’s easier to see what signals are acting and which are stable
Slide it to the right to have the blue LEDs show the status of the data lines present on the edge connector.
Slide it to the left to have the blue LEDs show stages of the diagnostic software.
This jumper is for compatibility with the Brazilian clones that use this line for audio.
When using a Brazilian ZX Spectrum clone (TK90X and TK95), disable the jumper (store it on one of the pins).
Enable this jumper for original ZX Spectrum models and other clones.
J1 JUMPER OPTION – FLASH/SPECTRUM
When a jumper is present on pins 1-2, it will enable the integrated diagnostics software.
When a jumper is present on pins 2-3, it will have the ZX Spectrum boot as normal.
J2 JUMPER OPTION – M1 IGNORE / NORMAL
When a jumper is present on pins 1-2, it will ignore the M1 line in case it’s not working properly.
When a jumper is present on pins 2-3, it will use the M1 line.
Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced!
INTEGRATED DIAGNOSTIC TOOLS
The ZX Diag Cart comes with the ZX Spectrum Diagnostics software, developed by Dylan Smith and Brendan Alford:
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Here at ZX Renew we love retro computing as much as you do. That's why we are passionate about bring you the BEST in high-quality replacement parts to keep your retro computing journey going into the future.
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