Search results

It's been a while since I ordered any boards. How much time should I allow from order placement to delivery in the USA for a JLCPCB order? Whatever shipping is inexpensive, not anything expedited and expensive. I'm thinking about assembling some boards for VCFMW 2026 and am working out by...

Anyone willing to purchase six sets of these and ship them to me in the USA? For some reason this seller will not ship to the USA. https://www.ebay.com/itm/394791001619 I have a set I'm very fond of, but after years of use, their edges are starting to fray a bit.

So I understand that 72 pin SIMMs use the /RAS signals to distinguish between and separately activate different banks. How is this done on the 168 pin FPM DIMM? There's a Bank signal, B0 on the DIMM, but the 9500 HDN claims this is tied to A0. The 9500 lists four /RAS lines, suggesting two...

I'm looking at the caches on Fizzbinn's excellent guide: https://tinkerdifferent.com/resources/ppc-macintosh-l2-cache-modules.19/ Specifically in the last category for PowerSurge and Catalyst machines: D - 7200/7300/7500/7600/8500/8600 160 pin Cache DIMM Pin groupings: 25 - 35 - 20...

Just saw this on Ebay: https://www.ebay.com/itm/306945112145 And notice that the main chipset is the same as the valuable Nubus cards. Looks like there are three or four PLDs that are different, and of course, the entire circuit board. Still, if someone is bored and wants to make a Thunder...

Anyone know what this signal does? It's connected to pin 35. It's shown on this schematic (page 6) https://www.macdat.net/files/pdf/apple/schematics/apple/powermac_g3_gossamer.pdf On actual ROM DIMMs, on most of them it's not connected to anything. On the 820-0961A module it goes to a...

I just went to message someone at MacGurus and found a nice "We're closed" web page, but no way of contacting anyone. I wanted to contact them about the possibility of TinkerDifferent hosting their old forum in read only format. Anyone have a contact?

I was browsing the items from Memory Master and they have a bunch of the PM6100/7100 ROM modules for about $13. https://www.ebay.com/itm/175602575946?epid=1228687524 Posting in case there are folks with a machine where the ROM was pulled. That's the 341-0741. I think it will also work in...

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...