Re: Repairing a SFD-1001 (8250/LP, 8050, 4040, 3040, 2040)

----- Original Message -----
> From: Gerrit Heitsch <gerrit@laosinh.s.bawue.de>
> To: cbm-hackers@musoftware.de
> Cc: 
> Sent: Monday, August 15, 2011 8:39:21 AM
> Subject: Re: Repairing a SFD-1001 (8250/LP, 8050, 4040, 3040, 2040)
> 
> After reading the datasheet for the 6530 I am wondering if no one ever has built 
> a small circuit to hook up to the user port of a C64 and dump the ROM of a 6530 
> that way. The circuit could be relatively simple, using a MC14040 (12bit binary 
> counter) as the counter for the address lines plus maybe some glue logic to 
> adjust polarity of the reset signal for the counter and control of the chip 
> selects for the 6530.
> 
> The data lines of the 6530 would be connected to PB0-PB7 on the user port and 
> the clock input for the counter to PA2.
> 
> Gerrit

I think the reason for the software dump is for those not comfortable removing chips from drives and to avoid potential damage that way. However, if you're not worried about that, then would it not be easier to make an adapter using IC sockets, so the 6530 appears like a 23xx ROM or 27xx EPROM chip? Then it could be read in a C64 cartridge or eprom burner.
 
Steve

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