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TL866II Plus ProgrammerXgecu
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C64 Diagnostic and Dead Test
Scheda diagnostica per C64 2 in 1 (Dead Test e Diagnostica)
Con questo PCB è possibile inserire anche un piccolo voltmetro per leggere la tensione del computer.
La scheda è pensata per essere semplice, un solo interruttore per impostare la scheda in modalità Dead Test o Diagnostica.
Attenzione, il passaggio da una modalità all'altra deve essere fatto a computer spento.
La Eprom, utilizzata è una 27C256 dove vanno inserite due ROMs, la prima è la Dead Test e di seguito la Diagnostica per C64.
Le ROMs da scrivere nella Eprom le trovate facilmente su Internet. (https://blog.worldofjani.com/?p=164)
Per programmare la memoria ho usato un TL866II+ ma va bene anche la versione T48, T58 o qualsiasi programmatore di Eprom che supporti la 27256.
La ROM Dead Test va scritta all'inizio della memoria (indirizzo $0000) perché quando viene selezionata la locazione di memoria, viene impostato il computer in modalità ultimax, cosa che non succede sulla diagnostica.
Occorre collegare i cavi aggiuntivi (Harness) al C64 per avere un controllo completo con la diagnostica, altrimenti non si potranno testare i funzionamenti dei Timer, CIA, SID e delle altre porte.
R1,R2: 10K (resistenza)
C1: 100nF (condensatore)
U1: 27C256 (eprom)
D1: 1N4148 (diodo)
Q1: BC347 o equivalente (transistor)
SW1: Slide switch DPCO (599293)
Reset: Pulsante 6x6 (TS02-66-60-BK-260-SCR-D)
Opzionale mini voltmetro : https://it.aliexpress.com/item/1005006906890114.html
Guarda il video: https://youtu.be/j6rI-YWFGfY
- English -
Diagnostic card for C64 2 in 1 (Dead Test and Diagnostics)
With this PCB you can also insert a small voltmeter to read the computer voltage.
The board is meant to be simple, just one switch to set the board into Dead Test or Diagnostic mode.
Attention, switching from one mode to another must be done with the computer turned off.
The Eprom used is a 27C256 where two ROMs must be inserted, the first is the Dead Test and then the Diagnostics for C64.
The ROMs to be written in the EPROM can easily be found on the Internet. (https://blog.worldofjani.com/?p=164)
To program the memory I used a TL866II+ but the T48, T58 version or any Eprom programmer that supports the 27256 is also fine.
The Dead Test ROM must be written to the beginning of memory (address $0000) because when the memory location is selected, it puts the computer in ultimax mode, which does not happen on diagnostics.
It is necessary to connect the additional cables (Harness) to the C64 to have a complete test with the diagnostics, otherwise it will not be possible to test the operation of the Timers, CIA, SID and the other ports.
R1,R2: 10K (resistor)
C1: 100nF (capacitor)
U1: 27C256 (eprom)
D1: 1N4148 (diode)
Q1: BC347 or equivalent (transistor)
SW1: Slide switch DPCO (599293)
Reset: Tactile button 6x6 (TS02-66-60-BK-260-SCR-D)
Optional mini voltmeter : https://it.aliexpress.com/item/1005006906890114.html
Look at this video: https://youtu.be/j6rI-YWFGfY
> Thanks for your support!.
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C64 Diagnostic and Dead Test
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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Andrej Gerbec
Nov 04,2025
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Jan Lunitz
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Engineer
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mike danick
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Tony RetroManiak
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przemoonn
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Jani Suomalainen
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Juan VM
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(DIY) C64iSTANBUL
Nov 21,2024
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