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Yes, the desire was for a reliable supply of 32-bit clean ROMs for the SE/30 to enable the various functions that require that. The IIfx and IIsi were the focus because there were actual ROM modules for those two machines in the wild. There were no IIci ROM modules (all soldered to main...

Anyone have a chip programmer that will program the Cypress CY2292F Clock Generator? I checked the device list for the two I have and it's not on there. Needham EMP-30. XGecu IL866II Plus. According to the datasheet you need a Cypress CY3670 with CY3095 adapter, but those items appear to...

I spent some time reading the WD37C65C floppy controller datasheet last night. This floppy controller is found in the Outbound Laptop Floppy adapter circuit board. The board takes floppy commands from the host Mac compatible laptop (SE or Plus ROMs) and sends them to a PC standard Citizen...

Do the X500/X600 and related clones use/need -5V on the power supply? According to these two articles posted (but no longer available) on XLR8yourmac.com the answer is no. And given the readership at the time of publication, I assume they would have been corrected by several readers if they...

This is related to my earlier thread, https://tinkerdifferent.com/threads/53c80-experiment.272/ Logic, in their datasheet claims that their 53C80 has better performance: So I actually looked at the pinouts in the Logic datasheet (datasheet attached in above linked thread). And the pinouts...

The datasheet for the Logic 53C80 claims Is this a big deal, or just the normal improvement one gets by switching from NMOS to CMOS (5380 vs. 5C80)? It seems like it would be interesting to do before/after SCSI performance comparisons on a Mac II family machine. Thoroughly benchmark the...

So I've always wondered this and it occurs to me that the folks here might know.... Is the voltage regulator module used in the Beige G3 specific to the Beige G3, or was that a "generic" type of module found in other computers of that age? I'm referring to the plug-in board, not the individual...

Kind of a more general continuation of the WTB 1MB cache for x100 machines thread. So paging @Ron's Computer Videos into the thread too. (First, I should mention that the Power_Macintosh Hardware Developer Note (for X100 machines) says the cache logic is in the HMC chip. So no need to...

What does the group mind think about trying to recover/republish some of the material that's been lost to time? In particular, I'm wondering if Mike Breedan (sp?) still has the many, many how-to articles that he's pruned from xlr8yourmac.com over the years. Plus the old compatibility...

I only have one example of the Rev. 3 6880M and I didn't want to risk corrupting the Flash contents by desoldering it, if possible. I noticed that a PLCC socket will fit over a PLCC chip, while it's still soldered to its host board. The chip will just be upside-down in the socket. So I made...