68kMLA Classic Interface
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| LC 475 Project - Upgrades - Mods | |
| Posted by: pizzigri on 2024-07-06 14:02:58 Yes! And a 650 cache card. Both are on my top list…. | |
Posted by: Kamshaft on 2024-07-06 15:00:27External antenna at a raspberry pico W seems to be possible but not easy. That video is for a zero. Not sure if it's the same. | |
Posted by: Powerbase on 2024-07-06 15:10:51L2 cache seems to have a big impact on the MacBench 3.0 CPU benchmark, at least for PPC Macs. The results of the FPU benchmark are not as dependent on a big L2 cache, it seems. The Speedometer CPU benchmark seems to either not favor cache at all or it runs completely in L1 cache.I want to second that. I would definitely pay for a 475/605 L2 cache card/thingie. | |
Posted by: Mustermann on 2024-07-06 15:11:05That video is for a zero. Not sure if it's the same.You are right, different board. It seems that neither your nor mine board does have prepared place for a antenna plug🙁 | |
Posted by: Kamshaft on 2024-07-06 15:27:17You are right, different board. It seems that neither your nor mine board does have prepared place for a antenna plug🙁I had a look at the PCB, I'm sure it's doable. lol The PCB is pretty small...would need a surgical soldering station! | |
| Posted by: Kamshaft on 2024-07-08 04:50:41 So, the floppy drive in this machine works, but the action of the disks going in and out is rough (The drive mechanism is a dirty/gummy). Basically it needs a good cleaning. Are there any good disassembly videos or web pages that you guys could recommend? My initial google search came up with a couple but I imagine Apple put all sorts of brands of floppy drives in their LC 475 machines. | |
| Posted by: Kamshaft on 2024-07-12 05:37:54 Heatsink, RAM and CPU have arrived. Time to install them this weekend. | |
| Posted by: Kamshaft on 2024-07-13 07:07:45 I found a floppy drive maintenance video. I thought I'd share... | |
| Posted by: Kamshaft on 2024-07-14 12:04:53 33mhz mod done!  | |
Posted by: Mustermann on 2024-07-14 12:40:0533mhz mod done!Are you able to share a photo of CPU prior mounting heatsink and a detailed photo of RAM module? | |
Posted by: just.in.time on 2024-07-14 12:41:07Are there any good disassembly videos or web pages that you guys could recommend?The 68kmla wiki used to have an excellent page on the floppy drive disassembly and maintenance. Not sure if it’s still there. | |
| Posted by: just.in.time on 2024-07-14 12:43:49 This is the link that used to go to the page: http://68kmla.org/wiki/index.php/Floppy_Drive_Lubrication However, it’s no longer loading. | |
Posted by: Kamshaft on 2024-07-14 12:44:29Are you able to share a photo of CPU prior mounting heatsink and a detailed photo of RAM module?CPU no, it's stuck on there. Not removing that heatsink! The RAM Yes!  | |
| Posted by: Mustermann on 2024-07-14 13:30:13 K4E640412D-JC50: 50ns, 4k Refresh 3,6V maximum Supply Voltage. K4E660412D Datasheet pdf - 16M x 4bit CMOS Dynamic RAM with Extended Data Out - Samsung ElectronicK4E660412D datasheet, K4E660412D pdf, K4E660412D data sheet, datasheet, data sheet, pdf, Samsung Electronic, 16M x 4bit CMOS Dynamic RAM with Extended Data Out
www.datasheetcatalog.com
So we learned: Even out of specification may work. Are the chips getting hot? | |
| Posted by: Kamshaft on 2024-07-14 15:19:38 The project thus far is nearly done. All I have left is to clean and lube the floppy drive, and replace the caps in the power supply unit. CPU Note: The heatsink on the 33mhz CPU gets pretty warm, but not crazy hot of anything. It's a full 68040 and it's native 33mhz. Not overclocked. | |
Posted by: joshc on 2024-07-15 00:49:11The heatsink on the 33mhz CPU gets pretty warmVery normal for these | |
| Posted by: pizzigri on 2024-07-15 01:17:40 Where did you get that heatsink? All I find is smaller, 486 sized parts… | |
Posted by: Kamshaft on 2024-07-15 03:38:55Where did you get that heatsink? All I find is smaller, 486 sized parts… Just an FYI...I had to wet sand the bottom of the heatsink "flatter", since it wasn't totally flush/level when it arrived, what do you expect for $5 Plus, I bought this roll of thermal tape, got lots left! LOL - https://www.amazon.ca/dp/B08LTZTGR1 | |
Posted by: Mustermann on 2024-07-15 04:26:53CPU Note: The heatsink on the 33mhz CPU gets pretty warm...How about RAM Chips? Is there a voltage regulator on the back side of the Module? | |
Posted by: Kamshaft on 2024-07-15 14:02:28How about RAM Chips?Have a look...  | |
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