> (Are there any commonly used addressing schemes for bigger memories?) The > transfer speed would be limited by the PC. At 1 MB/s, a cartridge image > could be transferred in a 1/256 of a second. > [COPLIN, Nicholas.] From memory the VCS emulator for the PC (MSDOS) includes some instructions on how to set parameters and lists hardware types for some of the biggers carts - I'll see if this has the info you may need. > I still haven't found an easy way to power the 74LS74 in the PC<->PET > transfer cable. Does anyone have the power specs for 74LS74, 74HCT74 and > CD4013? Could any of them be powered through some (possibly several) > lines on the PC's parallel port? Does the IC survive without damage if > its Vcc is inadequately low (say, 1 volt) and some of its inputs are > higher than Vcc (5 volts)? [COPLIN, Nicholas.] I've build a kit A/D interface which got power from the LPT port by wiring together all data lines after putting the signals through diodes. You have to program the data lines as "1" of course. The voltage drop means you get less than 5V, but didn't matter for this particular circuit. My guess is if you use the 74HC chip you might get away with it. The notes also warned though that the method is very LPT card specific as to what voltage you get. The other places to consider (no as neat admittedly) are KeyBoard plug and Joystick/Midi ports. [COPLIN, Nicholas.] - Nick ------------------------------------------------------------------------------------------------ PLEASE TAKE NOTE: The contents of this email (including any attachments) may be privileged and confidential. Any unauthorised use of the contents is expressly prohibited. If you have received this email in error, please advise us immediately (you can contact us by telephone on +61 8 9441 2311 by reverse charge) and then permanently delete this email together with any attachments. We appreciate your cooperation. Whilst Orbital endeavours to take reasonable care to ensure that this email and any attachments are free from viruses or other defects, Orbital does not represent or warrant that such are free from computer viruses or other defects. (C) 1999: Orbital Engine Company (Australia) Pty Ltd and its affiliates - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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