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Type: Posts; User: george

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  1. Replies
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    Hey, amateur, don't explain me how to repair or...

    Hey, amateur, don't explain me how to repair or reverse electronics or software. Go into someone else's shoes and explain them remotely. Scope is needed when you lack of brains in case you need to...
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    No, this is not a (power) load problem. It looks...

    No, this is not a (power) load problem. It looks like an alternate HGR page (or another memory region that belongs to neither HGR page) is shown while it shouldn't be. Try more games.
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    I guess you are a nerd then. Theoretical one....

    I guess you are a nerd then. Theoretical one. Where would you connect your scope's probe then? To the IC pins? To each one of them? To the solder pads below the socket? To all ends of each track? And...
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    The aging sockets of vintage Apple ][s are very...

    The aging sockets of vintage Apple ][s are very problematic and I suspected them as I have written in several messages in this topic. No IC was defective in this case. Up to //e I prefer some clones...
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    I am an engineer too. If I were you I would have...

    I am an engineer too. If I were you I would have called that "easy" when I had successfully built a working prototype. Do you presently FULLY understand how this PAL card schematics works even being...
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    Ciao. Nowadays I do recommend NTSC monitor...

    Ciao. Nowadays I do recommend NTSC monitor because NTSC TVs are scrapped and almost free and are still widespread. I doubt you can make PAL color adapter "easily" on the videoport. The level of...
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    RAM tests won't change colors in your case. Check...

    RAM tests won't change colors in your case. Check sockets of those three ICs. Check which one of them changes colors. Check once again ICs are good and they are as specified (don't rely on an IC...
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    mhz or MHz! The difference is 1 000 000 000 times.

    mhz or MHz! The difference is 1 000 000 000 times.
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    Don't tell me that your //c is also euro version...

    Don't tell me that your //c is also euro version ;). It is much more difficult to convert //e or //c to NTSC since this usually involves a replacement of IOU. As a pupil I had been using euro apple2...
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    All scanlines are there nothing is missing. Can...

    All scanlines are there nothing is missing. Can you verify one by one that ALL TTL chips are as specified and not having different number/marking. There are many TTL counterparts that have inverted...
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    The original Apple2 video output is NTSC anyway....

    The original Apple2 video output is NTSC anyway. The European version is somewhat crippled to me. As a child I was not pleased by euro clones we had at schools that used to produce only B/W video...
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    Interlaced does not mean missing lines. Anyway I...

    Interlaced does not mean missing lines. Anyway I understand what you mean though it is not well seen on these rotated pictures. Are there missing lines if you switch to a monochrome monitor? Is the...
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    I usually use the following program to test the...

    I usually use the following program to test the colors:

    10 GR
    20 FOR I = 0 TO 15
    30 COLOR= I
    40 VLIN 0,39 AT 2 * I
    50 NEXT

    Have you tried rotating the color trim capacitor on the...
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    Cheap for sale in EU: ...

    Cheap for sale in EU:

    http://www.ebay.com/itm/264377482610

    http://www.ebay.com/itm/264301528803

    http://www.ebay.com/itm/254371776483

    It is easier to convert your Apple2 to NTSC standard...
  15. EGA monitors do work with CGA cards. The pictured...

    EGA monitors do work with CGA cards. The pictured one works decently, the vertical size can be extended via monitor controls. The problem is related to your computer and/or its videocard.
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    This is way off-topic. As long as the floppy...

    This is way off-topic. As long as the floppy drive is installed and is working within its current PC and is 96 TPI capable the 800.COM TSR I attached here and several others like 2M will make...
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    I used even 800K for DS/DD media. This was...

    I used even 800K for DS/DD media.

    This was one of the utilities:
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    Considering the fact that Pentium is just a fast...

    Considering the fact that Pentium is just a fast 486 which in turn is just a fast 386 I would strongly disagree with the above statement. Which instructions are missing??? Don't tell me about CMPXCHG...
  19. The rarest and most sophisticated one of a kind...

    The rarest and most sophisticated one of a kind blessed by apple company the most capable plug and prey jumper never found in other electronics devices...If you look even closer you would discover...
  20. Explain what is the point then? To dig into the...

    Explain what is the point then? To dig into the non-standard registers of one of the thousands of low-number produced chipsets to achieve memory mapping ?!? What are you using this calculator for? To...
  21. I'd recommend QEMM386 or 386MAX. Anyway all of...

    I'd recommend QEMM386 or 386MAX. Anyway all of them (incl. the modest EMM386) are using 386 paging mechanism to map memory as needed and therefore are chipset independent. There is no logical reason...
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    I only read short notes about these in Intel...

    I only read short notes about these in Intel datasheets therefore I am not sure what type of files are they or which packages they may be included in. For example here is what the manual you provided...
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    I meant the original Intel complete and accurate...

    I meant the original Intel complete and accurate npu emulators. Are they available nowadays from public sources?
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    OK, you meant numeric exception. This is...

    OK, you meant numeric exception. This is absolutely not the case with the problem with data inconsistency described in this thread. The almost identical exceptions occur in 8087. On the same page you...
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    Which exception exactly? If you were right then...

    Which exception exactly? If you were right then an exception would point to the WAIT instruction and still not to the faulty instruction.

    This is an exact quote of Intel's manual which differs a...
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