Mark_W's latest activity
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MMark_W replied to the thread Classic II (early 4-ROM) black screen - RESET held low, no 15.7 MHz clock from EAGLE.If you've already checked voltage and clock signal on Egret, then it could be a dead EGRET chip. iirc on classic ii Egret chip is...
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MMark_W replied to the thread Macintosh SE Checkerboard pattern with random speckled dashes, no boot chime.Stumbled across this reset issue on an SE FDHD and made a post a while ago, it will get stuck at checkerboard pattern on powering up for...
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MMark_W replied to the thread Horizontal lines on SE/30 Display.Not on a se30 but I got this problem on a color classic, alternating white and dark lines are constantly moving from top of the screen...
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MMark_W replied to the thread Fix old Quantum drives.Just to add my 2 cents, I managed to fix a few conner and quantum drives with melted rubber bumper on the magnet, just wrap a few layers...
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MMark_W replied to the thread Sound issue recapped SE/30.Have you tried the headphone output? Is the sound clear on both channels? If so the opamp that drives the internal speaker or the...
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MMark_W replied to the thread Color Classic analog board re-design, needs community feedback..Should be easy to add a few extra pads and use jumper wires to reconfigure secondary winding connections to achieve 60V, 68V and 84V +B...
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MMark_W replied to the thread Weird Classic Woes - RAM or Logic Board?.Try to remove the ram expansion board and boot with 1MB onboard ram only, then run a memory test with snooper, see if it reports any...
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MMark_W replied to the thread Color Classic analog board re-design, needs community feedback..Good job. In your schematic you marked DL1 as BZX84-C8V2 which is a 8.2V zener diode. I also checked the schematic made by @jonschultz...
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