Re: EPROM Programmers AP64e MPC APEP and YKH128

[Wayne Lafreniere <wplafreniere@lynx.bc.ca>]

Hi Mark,

No it just does not "do" anything but crash. Just peeked iospace , slot no
program comes up. same with a pr#.
As for the Eprom, mine is a 16k chip - so may not be for this card at all!
Caution duly noted on switches.
Sorry didn't see your post about D2, but it is a small signal diode- boldly
marked 22 (nothing else I can see -wiggled back and forth). As for the other
two cards the APEP is probably an earlier relative of the AP64e.

Thanks, Wayne


Mark Cummings wrote:

> hi Wayne,
>
> > Hi Everbody,
> > I have three EPROM programmers I could use a little help with.
>
> sorry to hear of your 3x EPROM Programmer woes. hope this will at least help
> you get your AP64e going:
>
> > 1) an AP64e dosen't seem to work. replaced all small chips and 6821 with
> > good ones. NO dice so, Breadboarded a ROM reader and all I get are one
> > or two identical codes, doesn't seem right. Could some one send a ROM
> > dump of their EPROM. (By the way great AP64e docs on the web, someone
> > (sorry forgot name) did great work there !
>
> I'd like to know how far you got when you say it doesn't work ? maybe I can
> be of more help then.
> a few guesses are that you don't have the dip-switches correct, or the
> Programming Voltage is not working or adjusted wrong. go to the diagram
> below to work out where to adjust it. IIRC ~25.0V at the top of the wiper of
> the Potentiometer. this info is not in the manual. yet... (:
>
> anyway the Manual:
> http://home.iprimus.com.au/figjams/apple2/AP-64e.PDF
>
> Wayne Stewart also has another version of this book on his "organised" site.
> :)
>
> the Circuit:
> http://home.iprimus.com.au/figjams/apple2/AP64Ecct.PDF
>
> haven't done a complete EPROM dump yet, it's a bit of a catch 22 to get an
> EPROM image when you only have one working Programmer, but I have captured
> enough of it from memory to make another EPROM and then put that back in to
> read the original completely. ie so far I only have captured the 256 byte
> SLOT space and the 2K Expansion ROM out of a 8K EPROM (2732). the is 7x256
> bytes missing.
>
> if you need help or any measurements done to compare to your card, let me
> know and I will see what I can do. (email me at figjams AT primus DOT com
> DOT au)
> it is very important to get the dip switches right. I found that out after I
> first got my card and misunderstood the instructions, and actually had the
> dip switches opposite to what they should have been. after now drawing out
> the circuit I can see there is potential to damage chips if the dip-switches
> are in the wrong positions. this is why I added a note into the book where
> the dip switch settings are on page 3. I would also recommend switching off
> your Apple before changing dip-switches to prevent damage to the card/or
> Apple.
>
> > 2)MPC AP-EP This one doesn't have a EPROM so I'm assuming it has to have
> > 3) YKH-128 This is the nicest one Will allow me to burn 128k chips. (for
>
> sorry can't help with these two.
>
> > So there I am 3 cards - No way to read defective EPROM with the other
> > two. and no way to use the other 2 to make REV C scsi chips.  Help!
>
> There is some work being done between Laine Haughton & myself on a mod for
> the AP64e to do 27128's and 27256's. not sure when I will get time to
> continue on that yet, but I did post a question a while back, asking if
> anyone can tell me what component is fitted at location D2. On the drawing I
> put ZD2, which may be wrong. On my card it is simply a signal diode 1N4148
> (to clip any negative going pulse from Vpp), but there was a suggestion that
> it may be a Zener on some cards. if you can tell me what your card has at D2
> (near the bottom of the DIP switches) then that will help me. If you don't
> know a close up picture or just the codes on the diode may be enough.
>
> Mark
> down under (: