15658Re: [midatlanticretro] Isepik (Icepick)
- Dec 14, 2009Isepik is a combination of software and a hardware gadget that plugs
into the cartridge port.
It has a ROM on board (IIRC) that can be switched on after the target
program is running in the C64. I suspect it makes the switch after a
video interrupt, or something like that.
Anyway, once the gadget is in control of the machine, you can dump
the RAM contents on to a floppy disk, using a standard 1541 drive.
And, you'd be able to then load -that- disk directly with the drive.
And (again IIRC) you would not need the Isepik to run that disk.
The company asserted that it was not a tool for piracy, but making
legitimate archival copies of software you own. Right.
73 de Ray
On Dec 14, 2009, at 8:22 PM, Brian Schenkenberger, VAXman- wrote:
> Ray Sills <raysills@...> writes:
>> Somewhere in the bowels of MARCH's collection of "stuff" is an
>> or two. That was one of those gadgets that would let you freeze an
>> operating program, and then make a RAM dump on to a disk. On
>> -that- disk, you jumped right back into an operating program.
> Interesting. Can you elaborate some on this "Icepik"'s
> Such a tool would be very difficult to use on today's processors, even
> if you DID manage freeze and dump, and restore from said dump. States
> of CPU caches, instruction lookahead, virtual memory translation
> and multi-proccessor and interprocessor interrupts and interlocks
> cause no end to the headaches of trying to resurrect a system from
> snapshot. Perhaps such a thing is doable on a small system with a
> scule memory space but it's incredibly complex in today's larger
> with huge virtual memory address spaces. Hell even 4GB is a lot of
> ory to read in. If there's an external processor available
> (control or
> monitor or console) it's easier. There's simply too much trampling of
> the system's memory if trying to use the system CPU to fixup all
> read in. Such a feature was implemented in VMS V6. but then abandoned
> due to the complexity as newer features were added -- external storage
> controllers for one. The feature was called "snapshot" and "fastboot"
> for anyone interested in googling it.
> VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS
> "Well my son, life is like a beanstalk, isn't it?"
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