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  1. Replies
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    Apple 1 PROM programming (MMI 6301)

    I am looking to program a few MMI 6301-1J for my Apple 1 clone. Alternately an Data I/O 29 with Unipak to program them myself.
  2. Thread: Blue KIM-1

    by Kakemoms
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    Blue KIM-1

    Never seen a blue KIM before, but one just went on ebay. It seems to have been made for some special purpose with alot of other cards:

    Ebay

    Anyone know if this blue version was made by MOS or...
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    Early MOS devices or wafers

    I am collecting early MOS chips and wafers. If you have a good offer, please send me a PM. I may take a while to respond.
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    Another way would be to put your code into a ROM...

    Another way would be to put your code into a ROM at the expansion port or cartridge port (depending on which Commodore you are working with). On the Vic-20 for example, you have IO23 which gives you...
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    You can check out the original source of MS Basic...

    You can check out the original source of MS Basic https://www.pagetable.com/?p=774 or maybe one of these https://github.com/mist64/cbmsrc that is easier to assemble.

    As long as you keep routine...
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    How did it go? I have some ieee drives that I...

    How did it go? I have some ieee drives that I need to repair, but finding the source of the problem in these dual-cpu drives is not an easy task.
  7. Back in the day I had an A590 harddrive on a...

    Back in the day I had an A590 harddrive on a stock A500. It really made a huge difference to make a system that was useable for both programming and office work. I still used floppies for games.
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    I guess you can rule that out since he had it...

    I guess you can rule that out since he had it booting without the RTC (=real time clock) backup battery working bdfore that. Usually the config setting will go to default and show you a config...
  9. I do not know, but I share the same fear with the...

    I do not know, but I share the same fear with the C-brick, so I built my own. Its basically two Isolated 220V to 5V AC-DC converters that I put into a case. The reason is that I had a bunch of them...
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    Congratulations! I hope you will release it (when...

    Congratulations! I hope you will release it (when you are happy with it). :-)
  11. I bought a single Apple II drive (50$) and put...

    I bought a single Apple II drive (50$) and put the drive into a 2040. The controller card of the 2040 needs some repair, but the drive fitted. Apart from the SA400, the Apple drive is mainly a metal...
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    Looking for a VIC-1010

    If you have one, you know what it is. Reply to this tread if you want to sell. I may take a while to respond to PM.
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    Sorry for dual posts, but apparently I was too...

    Sorry for dual posts, but apparently I was too slow to edit the last one:

    The point was not that ARM isnít a great cpu, but that you often want low power useage and that current stand-alone 6502...
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    Last year I took apart my breadmaker, and inside...

    Last year I took apart my breadmaker, and inside was a 8086-based cpu. Its not uncommon to use 8-bit today since a few cents saved can be hundreds of thousands at large volumes. Using 16- or 32-bit...
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    When I spoke to WDC some years ago they claimed...

    When I spoke to WDC some years ago they claimed that a state-of-the art process in theory could give a >1GHz 6502 core.. but as you said, who would want that..

    What I don't understand is why they...
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    Amazing! And running at 20MHz... makes you wonder...

    Amazing! And running at 20MHz... makes you wonder why WDC's 65C02 never got above 14MHz...
  17. Hmm.. most of my stuff is rather common, but I...

    Hmm.. most of my stuff is rather common, but I have a few items that is less common than all the rest

    1) Original Commodore Semiconductor Group 6525 4 inch wafer (uncut). This is the tri-port...
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    Wow, impressive! The 2018 PET. :mrgreen:

    Wow, impressive! The 2018 PET. :mrgreen:
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    Also, if you need a replacement PSU, the 9V AC...

    Also, if you need a replacement PSU, the 9V AC line is only used to feed the cassette and user ports, nothing inside the C64 uses it. So for most uses (with a disk drive or SDIEC adapter), you only...
  20. Sice you have a decent knowledge of electronics,...

    Sice you have a decent knowledge of electronics, I would simply look at the hardware sections of 6502.org. Both the forum and list of projects based on the 6502-processor should give some great...
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    Just to follow up a bit, a MOS2050 SRAM wafer (...

    Just to follow up a bit, a MOS2050 SRAM wafer ( apparently from 1970) can be seen as a 2inch wafer here:
    49180

    I havenít found a datasheet for this component, but a later 1Kbit (256x4) appear in...
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    Did this stuff actually get salvaged? I.e. the...

    Did this stuff actually get salvaged? I.e. the tapes, documents and other historical stuff?

    From this link it looks more like they collected alot of thrashed PETs, but nothing of the "valuable"...
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    You are correct.. its the CIA interface chip used...

    You are correct.. its the CIA interface chip used in C64.

    Heh.. even if it was the Triport chip, I doubt I could have done that.. getting hold of packages for example is not so easy. Finding which...
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    Well, just to follow this up a little bit. I...

    Well, just to follow this up a little bit. I recently bought a 6569R5 wafer from someone on ebay. It is a full 4 inc/100 mm (pick your choice) wafer with 6569R5 chips. I am not sure if some of them...
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    If someone has a replacement INST key for the...

    If someone has a replacement INST key for the 610/720, I am interested!
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