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Satellite TV receivers & systems support forums
Analogue systems
Can anyone remember ?
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<blockquote data-quote="Nismo400R" data-source="post: 57143" data-attributes="member: 179432"><p>Prior to issue 06 of the Sky cards, the cards were commonly ST1834 microcontrollers. These were cards with EPROM memory. They required a programming voltage of approximately 21 Volts to write to the card. Once Sky activated the card, all you had to do was to make sure that the voltage on the programming pin Vpp was never allowed to rise near 21 Volts again. This involved fitting a 15 Volt Zener Diode and a resistor on the Vpp line to limit the voltage.</p></blockquote><p></p>
[QUOTE="Nismo400R, post: 57143, member: 179432"] Prior to issue 06 of the Sky cards, the cards were commonly ST1834 microcontrollers. These were cards with EPROM memory. They required a programming voltage of approximately 21 Volts to write to the card. Once Sky activated the card, all you had to do was to make sure that the voltage on the programming pin Vpp was never allowed to rise near 21 Volts again. This involved fitting a 15 Volt Zener Diode and a resistor on the Vpp line to limit the voltage. [/QUOTE]
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Can anyone remember ?
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