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This is... odd. RAM access on the 68000 is controlled by the /AS pin (noted "AS" in the pictures because my analyzer didn't want to let me add a "/"). It means "The address on the bus is valid and the CPU is selecting whatever is there". Normal /AS cycles look like the above images, about 4...

Started investigating, was curious whether something was up with the RAM timing. The original spec is 100 nanosecond RAM, Techknight's 8 meg card used 55ns and mine uses 70ns. This doesn't appear to be related at all. Below are screen captures from my logic analyzer, with my 8 meg card on top...

Well, I'll be taking a look at this to hopefully duplicate and try to fix.

The hybrid module is probably not at fault here. The hybrid sends a signal to the power manager chip which indicates battery level. And the power manager chip sends a signal to the hybrid to tell it whether -5 volts should be generated or not. If that battery level signal droops too low your...

I think it's pretty unlikely that the hybrid could be a cause of this issue. Assuming the power LED comes on to the BlueSCSI after exiting sleep, it's not a power issue.

I use a Hakko desoldering tool from under the main portable PCB. The pins are pretty skinny, there's a lot of solder around them. Correct, replacement hybrids include new pin headers.

Two thoughts on the LiFePO4. First, it might need time to charge up to full voltage. Second, your hybrid's battery level reporting opamps might be showing the wrong charge level. This happens with hybrids that have seen just about any level of capacitor fluid ingress, it gets into the...

For the curious, the attached picture shows the damage to the transceiver chips (likely caused by 12v from the floppy port). I swapped out all the chips excluding the activity LED driver (this is more isolated, running from 3.3 via pico) and now it's working again. The pico itself is making a...

Pretty sure that eBay listing is from @SuperSVGA

There's almost always a way, if you're willing to do the work and build it out yourself. :)

This issue was discussed in Discord. Turns out that the BlueSCSI unit was accidentally partially plugged into the Floppy Drive port. Floppy drive ports provide a variety of voltages which are hazardous to BlueSCSI, such as 12v. It was probably damaged by the over-voltage. I'm going to take a...

Doesn't look different to me. As I said, I also recreated *this specific* screen cable.

Yes, I'll put together some more of those. What you have is the official backlit screen upgrade for the original portable. And lucky for you, I also recreated this screen flex cable. It's just not listed on my site because these are so rare. Pretty sure I have at least one more of these cables.

I do think most or all of the 1x0 series powerbooks will have that 50 pin internal connector. It's for SCSI target disk mode, so the Mac can dynamically assign the SCSI ID of the internal hard drive for use with an external system. These drives use jumpers there at the back to set the SCSI ID...

Hello, Please see this wiki entry about the Mac Plus: https://github.com/BlueSCSI/BlueSCSI-v2/wiki/Compatibility#working-with-caveats The Plus and Mac Portable require a special "INI File" to be added to the SD card to make them work. Their SCSI implementation is just different enough that...

May 13, 2023 Board Meeting Attendance: Justin (jdmcs), Kai Robinson, Christian (fogWraith), Jacob (Androda), Bruce (Branchus) Absent: Ron (Ron’s Computer Videos), Josh (Drake), Eric (eric) Agenda: Item 1: Funds Remaining, and Donation Banner Notes: About 5 months of operational funds are...

As mentioned in the product announcement thread, I've ordered parts for a run of 10 of these cards. As soon as they arrive (could take awhile), I'll do the production run.

I am in process of working on a 7 megabyte Macintosh Portable RAM Card. It works in my test Portable, and I've sent one off to be tested in a Backlit portable. For me it has booted System 6.0.8, passed the Snooper RAM test, and plays games like Tetris and Risk with no issues. Why 7 megabytes...

March 11, 2023 Board Meeting Attendance: Kai Robinson, Jacob (Androda), Eric (eric), Bruce (Branchus), Christian (fogWraith), Justin (jdmcs) Absent: Ron (Ron’s Computer Videos), Josh (Drake) Agenda: Item 1: Clarifications on Recycler / EWaste Guidelines Before Moving Forward Notes: There...

You may be asking "Is F4 BlueSCSI abandoned?" after the announcement of BlueSCSI V2. This is the plan moving forward: Hardware sales have ended, but the designs will remain available for those that want to build one anyway If anyone wants to build and sell F4/F4Lite BlueSCSI designs, please...