Re: 16 MB REU clone
Date: 2001-08-22 13:19:30

Atmel has serial EEPROMS (AT24Cxx series). Available types are:
AT24C01 -> 1 Kbit
AT24C02 -> 2 Kbit
AT24C512 -> 512 Kbit
AT24C1024 -> 1 Mbit

and they're cascadable for bigger configurations.


You are in an empty cave. There's a rock in the middle with "Marko Mäkelä
wrote on 08/22/2001 12:01:15 PM" written on. A hollow voice says:
>On Wed, 22 Aug 2001, Rainer Buchty wrote:
>> But since the C64 already needs a few seconds to be fully initialized
>> the serial method shouldn't be noticeable anyway.
>Unless the chip is used as a buffer between the 5-volt cartridge port and
>the low-voltage memory chips, and the on-cartridge ROM is used for booting
>the C64.
>It seems that the smallest chip in this Xilinx Spartan-II family (XC2S15,
>100 pins) could otherwise do the job.  I wonder if there are easy-to-use
>serial ROM chips that could be programmed multiple times.  The XC17S00A
>family is one-time programmable.  There is the XC18V00 family, but
>apparently it is meant for the Virtex family (XC2V00 series) that might
>not have 5-volt tolerant chips.
>How long does it take to initialize the logic?  The XC17S15A PROM meant
>for the XC2S15 CPLD can hold 197696 bits of data.  The maximum speed seems
>to be 10 megabits per second.  At that speed, it would take 20
>milliseconds to boot the logic.  That should be acceptable.  The DONE
>signal could even be wired over a diode to the RESET input of the
>cartridge port, so that the system cannot start up too early.
>    Marko
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