Recent content by campbellashe

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 replacement PMGR.

Recap: After correcting the J15 power tap wiring, the Portable stopped booting. SYS_RST*/PMGR_RESET* stuck at 0V, F1 good, PMGR clock running. Traced PMGR_RESET* (J21 pin 46) to U15H pin 18 — the PMGR's hardware RESET input — confirmed via two independent schematic sources. The physical RESET...

Yeah. The pin 52 and the hybrid are the same at 2.7. I'm concerned that I fried my PMGR....

Thanks David. I’ll work on it tonight. Puts my RAM card development on hold…

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 lines to power a barrel connector and a 12 volt LCD -- yep. Shouldn't have done this. The LCD did power on; but now my computer will not boot. NO smoke; no pop...

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 Portable Versions (as you mentioned above). It will also have a pin to easily route a wire to the PDS for the DTACK. I don't have a backlit but will make the...

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.... The numbers are better than ever.... The fix: the ATF1502ASL CPLD on the RAM card now asserts /DTACK itself, via a bodge wire from CPLD pin 42 to PDS slot pin...

Running: Portable M5120 (non backlit) (BlueScsi as drive) Speedometer 3.23 "Performance Test" Snooper 2.0 "Memory Benchmark" System 7.1

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 from my CPLD and rewrite logic. Give me a bit to wire something up and i will let you know. Reza: “For my PDS RAM card designs, they assert /DTACK on their own...

This is the baseline Memory Benchmark on the non back lite running Snooper 2 and OS 7.1. Bluescsi as drive.

Yes. Better stated. Will validate again once I get back home tomorrow.

I did confirm that a poke of $FC0200 after sleep does improve speed from 22% to 51% on Snooper speed test consistently. Before sleep 51%, after sleep 22% and then post poke -- back to 51%. Addendum: I’m using a non back lit Portable.

Here is the SpeedTest app on Github: https://github.com/2tf2294x4g-maker/MacintoshPortableDTACKSpeedTest Not the best programmer and got some help from Claude to make it....

8MB RAM Card — Speed Testing Results and Analysis Following up on my earlier question about the slowdown with more than 5MB of RAM, I've done some deeper testing with my v2 8MB card (9MB total system RAM) and wanted to share the findings. Benchmark results (Snooper Memory Move) 4MB card (5MB...

David, I've got my 8 MB card working. Seeing slow down a boot with the 8MB setup. Do you understand the reason for the slow down. I 'm writing an INIT to poke the GLU; but I was expecting the slow down only to be post sleep; but now realize is is always there and am concerned that the INIT...