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Your F4Lite unit is not compatible with firmware for the original BlueSCSI. Only F4 and F4Lite specific firmware binaries will function properly. I don't yet have a build of this beta branch, it's something I need to work on. Been doing a lot of hardware-related prototyping recently. On the...

Unfortunately I don't know anything about the 520-like machines. Would be nice to have one for poking around at.

I don't own a Mac TV, but to my eye that capacitor pad probably goes to this via. It's the positive side of the capacitor (based on the curved silkscreen marking). If you check from that via to various other capacitors and chips, it will probably be connected to a power rail.

I'm hoping to have time soon to do all the calculating and get things in the right place for LC 520 and similar. With the SCSI port facing the right direction on my products, it should be easier. And I have yet another revision of the connector end that should make it even easier to line...

The pin spacing is standard 2.54mm. Was worried about that at first because they could have easily done something totally custom. But the mounting holes are for machine pin headers, not standard ones. I have a machine pin socket installed on a portable for testing, and exerting force properly...

After prototyping around a little more with opamps, I have sent in a new PCB design for manufacture. As mentioned in my previous post, this will be using all-new opamps instead of new-old-stock for better parts availability. The machine pin headers that are necessary for installation (mounting...

There are two major factors. Ceramic capacitors have a dramatically lower "ESR" than most electrolytics or tantalums. This means that they react dramatically faster to voltage fluctuations, and not all circuits are ok with that. Maybe an electrolytic was used to provide 'bulk capacitance' but...

Ceramic capacitors can't always be used to replace electrolytics. Their big advantages are neither exploding (tantalum) or leaking (electrolytic) ever. But not all circuits like them.

The display is rather unhappy with the ceramic caps I used, very wobbly. Guess I'll switch to tantalum, as much as I dislike those. Or maybe I can find teeny tiny solid polymer electrolytics.

Here's a fun tale about the differences between older parts and more modern ones. I have found a replacement opamp that works in place of the original OP20H. But this new opamp was causing odd behavior, where the 5v rail would *sometimes* (not all the time) spike up to full battery voltage for...

Recently I picked up a PowerBook 100 for cheap because it lacked the CPU card. Fortune favored me in that the CPU card was available from a seller in Tunisia and not labeled for the 100 - they had it listed by part number. Starting up the old machine resulted in the sad mac code: 0000000E...

@techknight has tested the one I sent over, and it's basically working. Revived a Portable that had been sitting around for something like 7 years. The caveat here is that the battery meter on his portable doesn't go all the way to "full "when it should. This is interesting, because testing...

That other opamp possibility didn't turn out to work, because it was too high a slew rate. Going to try another one, because supply of the original opamp is drying up and I don't have many of them.

Circling back to this project, I just tried the Samtec SMS-117-01-G-D as a possible new source for the connector on the backlit portable's screen cable. Sadly, the connector housing is *just barely* too large. The pin spacing is correct, but the socket doesn't want to fit. With a little...

PCBs are expected to be here on Thursday. I'm looking for two testers, DM me if interested.

Pictures of what? The F4 BlueSCSI products? Those are on my website.

I've tried this specific overclock configuration. It actually results in a decrease of read/write performance, for reasons I don't quite understand. Drops to 1700k read and 1500k write on beige G3. This overclock is a little weird and doesn't seem to realize that although [(25 * (500/25)) /...

This feature has been in the BlueSCSI codebase for a rather long time, actually. I think it was called out in this release because it had never been officially 'mentioned in a release notes' before. F4 BlueSCSI uses the same configuration as upstream, as mentioned in the Usage section of the...

Order is in for a small run of both PCBs: the new dual-opamp replacement and the style using original parts only.

Another pre-release set of binaries has been generated, to fix formatting-utility-related errors: Release Link: https://github.com/androda/F4_BlueSCSI/releases/tag/1.1-SNAPSHOT-2022-06-27 Firmware Update Steps: https://github.com/androda/F4_BlueSCSI/wiki/Flashing-Firmware-Updates