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    1. The 68kMLA Forum Rules   (5550 visits to this link)

      To quote vintage Apple manuals: "Read Me First!"

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    1. General 68kMLA News & Stuff

      What's going down in the barracks.

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    2. Conquests

      Discuss your latest vintage Mac finds!

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    1. RetroChallenge

      What can you do given only one month and strictly "retro" hardware? Find out with RetroChallenge!
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  4. 68k Model Forums

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      Just think, having a Quadra 950 in 1992 would be like having a Mac Pro today… except with more slots, more expandability, and on-board SCSI!

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    3. 68k LC & Performa

      Ah, the consumer computers!

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    1. NuBus Power Mac, LC & Performa

      The NuBus architecture gets a new brain!

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    2. PCI Power Mac & Performa

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    1. Apple I, ][, /// & Lisa

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    3. Software

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    4. Hacks & Development

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    5. Peripherals

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  • Posts

    • What does the output look like? According to the Apple II Reference manual the arrangement of the memory is as so: The row of RAM chips closest to the front of the machine has RAM starting at address 0. Next row is the RAM after that, etc. So if, for instance, you have output saying you have a bad RAM cell at location 0x434A, which is 17,226 in decimal, and your machine has the full 48k with all rows equipped with 16k DRAMS (which you'd expect on a Plus; any surviving Apple ][ with 4k DRAMs would be a heck of a find) the bad chip will be in the middle tow. The leftmost column of chips is the least significant bit. So if the program's output tells you it's the 5th bit that's stuck then it's the fifth from the left.
    • You might have better luck asking on vcfed.org.
    • Keep an eye out during Kansasfest this year, because just the other day, someone on the kfest mailing list asked if anybody has any bad 4116 RAM chips on a motherboard or on a language card or other card that might have those chips.   I think they're working on a software tester or perhaps work-around tool.
    • I know, my SCSI2SD v5 board has 100ohm resistor packs. However, I'll hope that they'll release the v5 board's sources in future (It's an improbable thing, but dreaming is costless)
    • Yeah, the 110ohm resistors are definitely getting harder to find.  SCSI allows an alternate configuration using 100ohm packs and dropping the terminator voltage to ~2.63V or thereabouts, if you want to try that in the future.
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