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Found 2 results

  1. Hi, I recently got a couple of "dead" 130XE's thrown in as part of a deal. The first 130XE only powers the RED keyboard LED, and doesn't output a TV signal (can't be found with the TV's auto-tune). It's also playing dead when I try it with a SysCheck board, so I am putting it aside for the moment. The second 130XE can be tuned in, but gives no picture. When I try it with a SysCheck board, I get U14 marked as bad. So, I need to get some more RAM chips. Is there any reason I should get anything other than 4164 dips? What I'm trying to ask is, are there any mods that involve replacing the 4164 chips with some other chips, giving more available memory? I'm guessing that this would be the ideal time to do such an upgrade, rather than ordering a load of 4164's that I don't need. I should point out both 130XE's have 16*4164 chips, so I would probably order 32 * 4164 to simplify shipping, etc. My plan is to just replace the defective U14, but I don't know if the other bank of memory (the extra 64K of a 130XE) has defects (I don't think this is tested by the SysCheck board - though I think it should be!). I don't think I can test this until U14 has been replaced. Although I have seen a lot of advice saying it's best to replace all the RAM chips, I don't want to do this unless absolutely necessary, as they are all soldered on. On the other hand, if there is a mod that involves replacing them all with another set of RAM chips, this might be a good time to do so (if you see what I mean). Finally, the second 130XE runs quite well with the SysCheck board plugged in (I'm really pleased with the SysCheck board, btw). I was playing Mercenary on it (48K and high res versions) from disk, and the keyboard is fine, apart from the 'H' and 'J' keys not working. I'm tempted to try swapping the keyboard from the set aside 130XE, but I don't want to do too much unplugging/plugging as I have heard that 130XE keyboards can be quite fragile. Any advice on the best RAM chips, and keyboard swapping strategy would be appreciated. Thanks!
  2. After stocking my Atari800XL with new RAM that I had for my C64, I went on a search for some cross-references to find out what other IC's would work as a drop in replacement. I've used several of these types in various C64's (NOT the C64C) with complete success. If you find any errors or additions, please let me know! The 4164 RAM IC has been shown to work in the following computers - ---------------------------------------------------------------------------------------------------------------------------------- Apple IIe Apple IIc (Early - Mid production) — late models with 4464 chips, do not work with 4164's Apple Macintosh 128k Atari800XL C64 - (Early - Mid production) — late models with 4464 chips, do not work with 4164's (C64C) C128 - (Early - Mid production) — late models with 4464 chips, do not work with 4164's C PET (Replaces 4116's) - See note at bottom for modification? COCO 2 - (Early - Mid production) — late models with 4464 chips, do not work with 4164's ---------------------------------------------------------------------------------------------------------------------------------- 4164 64K x 1 DRAM Cross Reference: Fairchild - MB8264-15 Hitachi - HYB4164P2BD, HM4864 Micron - MT4264-25 Mitsubishi - M5K4164AP-15, M5K4164 ANP-10 Mostek - MK4564N-20 Motorola - MCM4164BP15, MCM6665BP20, MCM6665AP NEC - D4164C-2, D4164C-15, uPD 4164-1 Samsung - KM4164B-15 OKI - M3764A-15 Toshiba - TMS4164-15NL, TMS4164-20NL ---------------------------------------------------------------------------------------------------------------------------------- I also found some information on replacing 4116 RAM with 4164/4516 RAM. Here is the info from the C64 Wiki about replacing 4116 RAM with 4164 RAM (I'm not sure if the method is the same for the 4516 RAM): Some of the systems that use 4116 RAM are the Colecovision consoles, TI 99/4A computers, and some Williams arcade PCB's like - Defender, Joust, Robotron. How to use a 4164 chip instead the original 4116: Bend pin 1 und 8 upwards so they no longer go into the socket's connectors. Connect Pin 8 and 9 with one another through a short piece of wire. Make sure pin 1 and 8 are not in contact with any other components nearby. Insert the chip like this into the socket. If you need one of the 4164 chips, you can also use a 41256 instead. You have to solder a short piece of wire between pins 1 and 16 of that chip (these are the pins just left and right of the alignment notch on the chip). This mod will make the chip look just like a '64 chip to the system. ---------------------------------------------------------------------------------------------------------------------------------- PLEASE make sure to check my notes before you purchase or install these RAM IC's. It's always good to make double - sure! I hope this list helps you find the RAM that you need!
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