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Type: Posts; User: george

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  1. Replies
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    rtfm.

    rtfm.
  2. Replies
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    https://mirrors.apple2.org.za/Apple%20II%20Documen...

    https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/80%20Column%20Cards/Videx%20Videoterm/Schematics/Videx%20VideoTerm%20Schematics.pdf
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    Ciao. The motherboard should start without the...

    Ciao. The motherboard should start without the keyboard normally and even boot from a drive until a key press is needed by the software.
  4. One is pretty much forced to work for others...

    One is pretty much forced to work for others since protected images must be sent to someone to "manually" convert them into their working image...Writing back to physical diskette without...
  5. Applesauce is a bit better but is still in its...

    Applesauce is a bit better but is still in its infancy. We've bought recently that expensive device too. My advice for those who consider obtaining it is to postpone their purchase. I am exchanging...
  6. No, I have a friend who owns one and this device...

    No, I have a friend who owns one and this device has great problems with dealing even standard non-protected DISK II 140K diskettes. Note that it also uses PC MFM FDDs.
  7. Does anybody know mtdt2 Michael Dexter buyer on ebay?

    Does anybody know mtdt2 <REDACTED> buyer on ebay?
    His address is :
    <REDACTED>

    Bought almost all of my 4164 vintage socket pulled tested in ZIF socket programmer DRAMs a couple of weeks ago...
  8. Is there a software to transfer/image RANA ELITE Three DS/DD diskettes?

    Is there a way to transfer/image RANA ELITE 3 (or previous) DS/DD diskettes? Rana Elite drives are GCR drives connected to a standard Disk II controller but have higher number of tracks and/or sides.
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    Probably your motherboard is faulty. Is the other...

    Probably your motherboard is faulty. Is the other (vertical (up/down) input in your case) working? Are the buttons of the joystick working properly?
    Check that four 22nF capacitors next to the...
  10. First thing to replace is the 6551. But why don't...

    First thing to replace is the 6551. But why don't you sell the cards as faulty?
  11. Replies
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    8087 also relies on 8088/86 for all address...

    8087 also relies on 8088/86 for all address generation.
  12. https://jbretro.wordpress.com/2016/08/09/apple-iig...

    https://jbretro.wordpress.com/2016/08/09/apple-iigs-romtechnote/

    Is the VGC bug related only to composite video?
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    This is s****d ad. These Russian guys only order...

    This is s****d ad. These Russian guys only order PCBs from Chinese and resell them. You can do it yourself 12 times cheaper including worldwide shipping for example at www.allpcb.com or...
  14. Looking for the MCS-48 firmware of this Apple ][ clone keyboard...

    Looking for the MCS-48 firmware of this Apple ][ clone keyboard which to my shame I fried more than a decade ago by connecting its ribbon cable rotated by 180 degrees into the socket. It recently...
  15. Thread: 6502 vs 65C02

    by george
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    3,014

    The seller hasn't edited their listing so don't...

    The seller hasn't edited their listing so don't hesitate to leave negative feedback, one minor thing that you could do to clean ebay from bad chips and make it easier for yourself when you buy next...
  16. Further investigation lead to a conclusion that...

    Further investigation lead to a conclusion that stack and direct page cannot be moved out of bank 0 due to CPU limitations. Therefore my answer to my question in the first message of this topic is...
  17. Speed is irrelevant in this case. The shadowing...

    Speed is irrelevant in this case. The shadowing works only in one direction from banks 0/1 to banks E0/E1 and not vice versa you can try it on a real //GS and on an emulator for example in a HGR...
  18. I am trying to achieve higher compatibility of...

    I am trying to achieve higher compatibility of the legacy Apple2 peripheral cards and 6502 software under Apple //GS. For example I discovered that peripheral cards that use *INH signal to map their...
  19. Studying further the docs I found out that 65C816...

    Studying further the docs I found out that 65C816 supports running emulation mode in banks E0/E1 (and in every bank) but the Apple 2GS ROM is unable to handle interrupts from banks other than 0/1. Is...
  20. Apple //GS: Is there a way to boot and run an Apple ][ 6502 OS in banks E0/E1 ?

    Apple //GS: Is there a way to boot and run an (existing?) Apple ][ 6502 OS in banks E0/E1 in native CPU mode? No GS features are required. 1MHz clock like on previous Apple2s is perfect. The reason...
  21. A vintage maybe unknown Apple2 game I recently rescued from almost destroyed diskette

    I am posting here a diskette image of a probably unknown vintage Apple ][ game I recovered recently from almost damaged factory diskettes I acquired on the local aftermarket. Would be surprised if...
  22. You have no other option but you've payed well...

    You have no other option but you've payed well for this CFFA card you'd better ask in its author's support forum.
  23. I guess this attitude leads to your design flaws,...

    I guess this attitude leads to your design flaws, but it could be something general -- for instance Australian law that kills cats...
  24. My assumptions are right and unlike you I would...

    My assumptions are right and unlike you I would have listen to your logical arguments that you never provided. When I wrote you in another forum that only a 22v10 should be enough to control the SRAM...
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    It does not support WOZ disk image format so I...

    It does not support WOZ disk image format so I find nothing interesting in this card.
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