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dougg3's latest activity
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dougg3
replied to the thread
Faster Baud and More Serial Ports (CSI Hurdler, SerialDMA, QuadraLink)
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Interesting! It appears that the DCB structure also allows just setting it to an arbitrary number, according to Microsoft's docs. For...
Sunday at 6:19 PM
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dougg3
replied to the thread
LC520 Overclock
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Happy to help, it's a fun little puzzle. Here's a little mini deep dive further into it. I thought about it some more, and I think I...
Oct 16, 2025
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dougg3
replied to the thread
LC520 Overclock
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My assessment is that R80 only matters if you are using a ROM SIMM. It shouldn't matter for any kind of overclocking or conversion from...
Oct 16, 2025
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dougg3
replied to the thread
LC520 Overclock
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Yep, this is definitely the same circuit as the CC. I just beeped it out as best as I could on my 820-0368-A board from a caddy-loading...
Oct 16, 2025
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dougg3
replied to the thread
LC520 Overclock
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That pin (pin 2) on the ROM SIMM socket is VPP, which is 12V power for allowing EEPROM chips of the era to be reprogrammed in-system...
Oct 15, 2025
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dougg3
replied to the thread
Testers Needed: Modified ROM for LC475/Q605
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I'm glad you got something working, @JDW! I know I said I wouldn't derail the thread, but just wanted to add one more thing after your...
Sep 30, 2025
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dougg3
replied to the thread
Testers Needed: Modified ROM for LC475/Q605
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Uh oh! Unfortunately I don't have an actual machine running High Sierra to test against, but I can confirm that in my High Sierra VM it...
Sep 29, 2025
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dougg3
replied to the thread
Macintosh performa 475 simm slots
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It's for a ROM SIMM that could override the soldered-on ROM chips. Most 475 boards I've seen don't have that socket populated; you might...
Sep 26, 2025
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dougg3
replied to the thread
Calling on Color Classic owners who own a TechStep
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For what it's worth, on the ADB side, bbraun discovered back in the day that the TechStep sends a special ADB command on machines with...
Sep 6, 2025
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