campbellashe's latest activity
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Ccampbellashe replied to the thread Expansion Memory Cards and Speed Limitations above 5MB on the Macintosh Portable.Just posted my new version working.... RAM Expansion Card v 3 Git...
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CJust wanted to share a new board for the Macintosh Portable RAM Expansion. Uses the RAM slot. Configuration to include sequential RAM...
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..I had to source from a non working Powerbook 100 that I got online. I felt guilty, but I'll still work to get the Powerbook working...
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..Well. Fixed, it was the PMGR and all is great... so awesome to hear the chime.... now back to my RAM card
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..Okay here is a new problem. No 12 Volt line..... Current measurements with bench supply at 6.5V: ALWAYS ON +5V (hybrid pins 11/18)...
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..I tried injecting 2.4 volts via the R151 after isolation. No chime and no change. I'm moving to Hybrid replacement next and awaiting my...
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..Recap: After correcting the J15 power tap wiring, the Portable stopped booting. SYS_RST*/PMGR_RESET* stuck at 0V, F1 good, PMGR clock...
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..Yeah. The pin 52 and the hybrid are the same at 2.7. I'm concerned that I fried my PMGR....
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Ccampbellashe replied to the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted..Thanks David. I’ll work on it tonight. Puts my RAM card development on hold…
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Ccampbellashe posted the thread Troubleshooting Macintosh Portable after loading 12V line-- self inflicted. in Macintosh Portable.Okay. I was getting excited and tried to internally power and LCD replacement off the J15 connector -- using 4 12 volt lines and 4 GND...
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Ccampbellashe replied to the thread Expansion Memory Cards and Speed Limitations above 5MB on the Macintosh Portable.I'm working on my version 3 board already; will integrate what I learned from version 2 and will include a jumper for the two Mac...
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Ccampbellashe replied to the thread Expansion Memory Cards and Speed Limitations above 5MB on the Macintosh Portable.Okay. Wow. What a difference the bodge wire and code logic change made with driving DTACK Now no slowdown at all on the 8MB card...
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Ccampbellashe replied to the thread Expansion Memory Cards and Speed Limitations above 5MB on the Macintosh Portable.Running: Portable M5120 (non backlit) (BlueScsi as drive) Speedometer 3.23 "Performance Test" Snooper 2.0 "Memory Benchmark" System 7.1
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Ccampbellashe replied to the thread Expansion Memory Cards and Speed Limitations above 5MB on the Macintosh Portable.Agree. I got in contact with Reza and he confirmed the use of the PDS and DTACK, I’ll try to place a wire to the DTACK pin on the PDS...
