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I want to see if your working 1 GiB DIMMs have a similar layout to the DIMMs that @DanaTheElf has which are being detected as only 512 MiB.

Connect the MDD to your network via Ethernet. Boot into OS X to get it's DHCP assigned IP address. Boot into Open Firmware and use that IP address in the io command to change the input/output device of Open Firmware from keyboard/screen to telnet. In the first post at...

Can you grab the SPD of your 1 GB DIMMs to compare with these two at https://68kmla.org/bb/threads/g4-mdd-ram-recognised-at-wrong-size.52427/post-592172

All 14 of the internal checksums match. The first 5 only apply to the first 3 MiB. The remaining 9 apply to the entire 4 MiB. 077d.27f3 "Boot PBX 603 0.0" 4096 852cfbdf 0426d533.047a30b0.0355dc82.03ff11eb...

When pasting text output in a forum post, first paste it into a text editor like BBEdit.app to make sure copying from Terminal.app does not double space all the text (because of windows CRLF characters?). Then copy from the text editor into the forum post with at the beginning and at the end...

The .properties command will truncate large properties. Use this to dump the entire contents of the dimm-info property. " /memory" find-package if " dimm-info" rot get-package-property if ." property not found" cr else dump then then For the i2c method, try this: " ui2c" select-dev h# 100...

If it works well enough to zap the PRAM, then it should be working well enough to get into Open Firmware? Connect the modem port with a printer serial cable to another Mac. This is the code in Open Firmware (inside the _cold-init word) that checks for Command-Option-P-R and initializes nvram if...

homebrew website says no.

Would be interesting to compare SPD of your working 1 GB DIMMs with DanaTheElf's non-working 1 GB DIMMs.

Use Open Firmware to dump the SPD info from the DIMMs using I2C. The SPD data will indicate the size and layout of the DIMMs. https://68kmla.org/bb/threads/g4-yikes-and-ecc-ram-also-the-reported-speed-and-type-for-all-ram-in-system-profiler-being-unknown.48707/post-547169...

Try this? https://tinkerdifferent.com/threads/new-diagnostic-tool.4593/ MiSTerFPGA core for the LC means you are emulating an LC on the MiSTerFPGA? Does the MiSTerFPGA have a serial port you can connect to?

How can a compiler miscompile pure integer code? Floating point should only happen when there's a floating point variable, or a floating point literal (a number with a decimal point) or a function call that takes or returns floating point variables.

I don't know of any power level reading registers. We don't emulate anything like that for any machine in DingusPPC. PCI cards have PRSNT bits that tell the machine how much power they require but that should only be checked during Open Firmware's probe-all - long after POST. The PCI prsntbits...

If it's doing the system chime then it might be able to reach Open Firmware (Command Option O-F) or the Serial Test Manager (some POST error might cause it to automatically enter the Serial test Manager). Either one will require a serial connection to the modem port to check. You'll need a...

I guess I misread the original post or the thread title. I thought it was booting with a display connected somehow. You're not seeing anything from the serial port? What does failure to post look like? no startup chime? I wonder if it enters the Serial Test Manager? Maybe you need a bus...

Yes. But there may be hidden things missing from the emulation such as Board ID registers. Schematics and memory dumps, etc. may show these hidden things.

Yes. You are able to do that by connecting a display? Get into Open Firmware, do the probe-ids. Disconnect the display while still in Open Firmware. do probe-ids again. We'll see if there's a connection between the ID's and the display connection. What does failure to post look like? no...

The OHare ID register might have some Machine ID info. Use probe-ids in Open Firmware to probe it. https://68kmla.org/bb/threads/photo-request-5500-6500-and-tam-logic-board.46450/post-576941

Burst capability? Burst ROMs are mentioned in the Gossamer_HW_ERS_0.1_19961007.pdf document. Pin 15 of the 74LVT244 is an input and is connected to pin 5 when OE2 is low. pin 5 is MEMDAT(33). These are bits of the 16-bit Gossamer system register at 0xFF000004. The bits are defined in...

Is the 6500/TAM emulation of DingusPPC good enough to test this? It might be missing some stuff that makes the emulated machine identify itself as a 5500 AIO if such stuff exists. Would need to compare dump-device-tree and DumpNameRegistry and System Profiler and UnivTables low memory globals...