[Coco] About those EPROMS...

[Stephen H. Fischer]

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