rbaltiss@worldaccess.nl wrote: > Hallo Andre, > > > I once made an IEEE488 cartridge for the Atari ST ROM port, without > > tapping R/W. reading from a block of 256 addresses is outputting data > > on the address lines :-) > > Smart, but costly. But this triggered my mind to produce the following idea > but based on your original concept. Replace the 6510 by a board with the > 6510, a 74LS610/2, buffers, some glue logic and a bus to connect even more > hardware. In this way you can use your C64 as you use your CS/65 a pod for > your 1541. One question remains: how do you handle the clock signal? Is it > possible to use the 1541 wih a "processor" which is running asynchrone with > the onboard 16MHz. clock. Hm. This idea is quite nice actually. Why didn't I have it :-) I think the 6510 with 2 MHz (because of the MMU 74ls610 delay you need a faster CPU - it puts the addresses on the bus earlier, even if clocked with 1Mhz) is not available, and I would have to build the CPU port myself. And then you can also take 65sc816 or such a beast for it - although the MMU solution is _much_ more elegant :-) > > .... Remember, the PET has _no_ NMI source. > > ?????? What do you mena with this? That was a comment on something I don't remember... The NMI line of the CPU is only connected to the expansion port of the 8032 (see your schematics on funet - BTW could you please upload a version where the drawing color is not transparent? Netscape prints transparent on white -> completely white :-( The 3008 schematics is ok.) Andre -- Email address may be invalid. Use "fachat AT physik DOT tu-chemnitz DOT de" ------Fight SPAM - join CAUCE http://www.cauce.org------Thanks, spammers... Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG http://www.tu-chemnitz.de/~fachat
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