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Although I like to stay true to my 68K roots, I recently acquired a PB 540c with the Apple 603e 100MHz upgrade card. So decided to take this up to OS 8.6, because why not? :)

Almost spit up my Diet Coke reading this comment @shirsch!!! But seriously though, there are several things I am waiting to buy from Jurassic Computing. Now I need to add this shim to my list.

Jumping on this old thread, I think I am going to get the NF-A8 PWM for my Quadra 700 power supply. I finally got to see a Noctua fan up close in an LCIII that I bought from @jmacz. I am in love with that fan! So it looks like the NF-A8 PWM has a 4-pin connector. Did you all just splice up the...

Just took the poor man's approach. I modified the highlighted manufacturerId (C2C2) and deviceId (A4A4) in the CODE2 resource of the Flash Tool with the appropriate values for my ICs. Worked like a charm. (Proceed with caution however, make sure you enter the right values, understand the type of...

Decided to play with this a bit last night. Very simple issue, the UnlockFlash(9090) command simply tells the ICs to expose their manufacturer ID and device ID at address 0000 and 0001. I was getting really stuck on the ROM having BBBB at these addresses. So basically just need to recompile...

Very well done!! I can only marvel at this reverse engineering :)

To help keep myself organized, I put together a template to use for several iterations of testing different ROMs and SIMMs on my Q650. Attached are my notes, and admittedly my handwriting is AWFUL! But, I think this testing confirmed to me at least that the memory is being sized correctly...

@schrockwell if you get to the point of selling any completed board builds, I think you'll have some buyers! I'd like to get in line :)

Yes same with mine. Initial guess is it has to do with the amount of space in the ROM for the updated chime. A while ago I tried replacing the sound bytes, but ran into some issues. I'll need to revisit that again soon.

Here is probably a better way to visualize what I am trying to say. I'll do some more testing tonight. If this is how it works, then technically I suppose a single installed double-sided SIMM would never be interleaved (ie, banks 2 and 4 populated). So this would be a good way to test this theory.

@cy384 I'm still digging into this. I wanted to bounce this off of you, so I quoted your above post here. This is from when you booted with 3x 128MB SIMMs. I am wondering if the banks are setup like this in the Q650? So take just one 128MB SIMM.... I see from the wombat tool that it shows the...

Throw in a ROM SIMM slot, then that will open up new avenues of fun and expansion :)

OK very interesting! No I hadn't seen this thread yet. What you are saying in this thread surely makes sense to me, and I may give this a go (ie, hardcoding the values). I did re-write large chunks of the resizing code in assembly but that hasn't cracked the nut yet.

Yes I may take you up on this. I'll certainly pay for the card too. I did go so far as zeroing out banks 0/1 in the SIZEMEMORYPATCH routine in the ROM. But basically same behavior. Although one time I did get the system to boot just fine with 3x 128MB SIMMs. So banks 2/3 4/5 6/7 were each the...

Unfortunately not. I was thinking about getting one however. With the OneBufferedBit set, I can tell the Q650 boots all the way into the OS as the normal soft shutdown does the alert, then enter powers it down. I have some new SIMMs on the way: each chip 16Mx4 (=8MB), 8 chips per bank (=64MB)...

I'm pretty close to getting 512MB to register in the Q650, at least I hope. I do think it may have to do with the power/voltage drain by the big SIMMs. When I poke the 50F0E000 register and set the OneBufferedBus bit, the Q650 posts and does a full boot with 4x 128MB SIMMs. But by setting this...

This is fantastic! I've been looking for a MacClip Jr for a long time. I am going to follow your instructions and see if I can build one to clip on :)

Sorry, been out of pocket for a while working on some other hobbies. Returning to my newly arrived Q650, I can get it to register 328MB of RAM so far (8 onboard + 128 SIMM + 128 SIMM + 32 SIMM + 32 SIMM). I am running into the same issue BBRAUN documented back in 2012, where 3x or 4x 128MB...

Yes I pushed the ROM speed to the lowest (fastest), with the CayMac universal SIMM, and no issues. I ran another quick benchmark comparison, this time between 40MHz/60ns RAM/120ns ROM and 40MHz/60ns RAM/55ns ROM, and the faster ROM does make a small but noticeable difference for just about...

Oh that's a good idea to try that now with the onboard RAM disabled. I was just using romSpeed=100 (4) per the MEMCjr manual, which looks to be 120ns. I bet I could push this number down now with less latency on the RAM. I'll give this a go too :)