[Coco] About those EPROMS...

[Dave Philipsen]

Very cool!  A remote control for the geeks!



On 4/9/2015 7:22 PM, Stephen H. Fischer wrote:
> Not encrypted but some great minds did the work so I can program my RCA IR programmable 8 device remote control down to the machine code level. I have made no changes and am one step above that level. I almost did but my HTPC made my VCR not needed which freed up a lot of the space.
>
> Google "JP1".
>
> SHF
>
> ----- Original Message -----
> From: "Mark McDougall" <msmcdoug at iinet.net.au>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Thursday, April 09, 2015 5:09 PM
> Subject: Re: [Coco] About those EPROMS...
>
>
>> On 10/04/2015 9:51 AM, Stephen H. Fischer wrote:
>>
>>> You can use the ROM for random number generation which is all you can use
>>> it for if you are not the NSA.
>> Some of the simple 'line scramble' schemes were trivial to reverse-engineer.
>> I personally did so on a couple of very early arcade games when I was
>> writing the MAME drivers for them - simply by buzzing out the address and
>> data lines to/from the ROM on the PCB.
>>
>> One of them also had a simple XOR 'encryption' which I reverse-engineered
>> using brute-force black box analysis.
>>
>> A bunch of games with much more sophisticated schemes have been
>> reverse-engineered by smarter people than me on the MAMEDEV team. Capcom
>> CPS2/3 a case in point - even without access to the keys in the CPU the
>> encryption was eventually broken after many months of effort. These efforts
>> not only allow the games to be emulated, but also allow original arcade
>> PCB's that have 'suicided' to be 'phoenixed' (brought back to life),
>> allowing the rightful owners to play them again.
>>
>> So the NSA don't have a monopoly on this sort of activity.
>>
>>> I think about useful things and have no problem that I was incorrect
>>> about reading the contents. The silliness of the link also came into
>>> play.
>> Not having a go at you at all, simply trying to put the facts out there.
>>
>> Regards,
>>
>> -- 
>> |              Mark McDougall                | "Electrical Engineers do it
>