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Which ROM is ProMedia 20? If you want to make changes to the ROMs, then you'll want to look at the Forth code. You can retokenize changes into a new ROM with my OpenBIOSStuff. I have a Open Firmware Extender 2.4 for Beige G3's that have Open Firmware 2.4. Open Firmware Extender loads Open...

My reply at https://68kmla.org/bb/threads/looking-for-formac-promedia-40-rom-rip.52158/post-588568

Macintosh Garden has CDs from Formac containing many ROMs or drivers. Just search for Formac. I think this one from February 2002 has 64 ROMs for 17 different products: https://macintoshgarden.org/apps/formac-drivers-version-2011-01-05-archive https://macintoshgarden.org/apps/formac-022001...

Is this transceiver just used to send the external clock to the two sides? Does the PAL do anything else? Isn't the external clock used on both sides of the connection? The external clock affects the data speed. Why use data speed to affect the data speed? If the same external clock is not...

It can do fill operations - solid color or patterns. A pattern is a source bit map that is used repeatedly. A solid color is like a pattern that is one pixel in size.

The 8500/8600 can sense when a composite or s-video display is connected. The DingusPPC emulator does emulate this behaviour. The bits are in a board register accessed at address F301E000. It's a 16-bit little-endian register. Read the register in Open Firmware like this: F301E000 rw@ 4 u.r...

There's a version of the GeForce 4MX firmware for AGP/PCI at http://themacelite.wikidot.com/wikidownloads2 The problem is that the firmware has dependencies on New World Open Firmware. Modifications are required to make it work on Old World Open Firmware as discussed for newer Nvidia cards like...

3.5" floppy drives have two heads so you can use both sides of a double-sided disk (the difference between a 400K and a 800K disk). 5.25" floppy drives only need one head because you can manually flip the disk over to use the other side. https://en.wikipedia.org/wiki/List_of_floppy_disk_formats

My fork of the DingusPPC emulator has a function MonitorSenseLines in applesense.cpp that can calculate and draw all the Apple Sense Code possibilities (anything possible with just diodes or wires).

More on Apple Sense Codes at: https://tinkerdifferent.com/threads/documentation-for-db15-to-vga-adapters.318/post-21288 The VGA option doesn't use a diode - just a line from sense 1 to sense 2.

You need to make sure that your app or driver becomes the owner of the serial port so that others don't mess with your settings. I don't know if just opening the driver is sufficient. Go here and search for SerialDriverArbitration...

Break the remainder of the plastic fingers then create an alternative capture mechanism?

Read the SPD in Open Firmware using this: \ Use read-iic ( len offset addr*2 -- addr len | false ) in a loop to look for i2c devices dev mac-io/via-cuda cr 80 0 do 80 0 i 2* read-iic ?dup if cr i . dump cr then loop These are results from a B&W G3 (it has three 256 MB DIMMs): 31 ff86b87b...

The software (HwInit) will accept it as 512MB. The hardware might not be able to use all of it if the grackle is limited internally to 24 address bits even though it looks like it has enough pins for 26 address bits. I suppose one could insert a working DIMM (between 8 and 256 MB) into the...

I believe that's a 128 MB physical bank (noted in the "Module size per bank" column of that table). The 4 or 2 banks in the "Bank x Row x Column Address" column is the internal banks. Not the physical banks. 4 internal banks, 12 rows, 10 columns = 4 * 2^(12 + 10) * 8 bytes per access = 128 MiB =...

I know the HWInit code in the Beige G3 ROM does check the SPD for RAM types EDO or SDRAM and has code for sizing based on that RAM type. The memory test works only up to 768 MiB installed. If you could add more (using two 512 MiB DIMM or one 1024 MiB DIMM) then it will crash. If the memory test...

There might be something strange about your terminal app's scroll back buffer or terminal emulation. I use Serial.app on macOS with unlimited scroll back buffer (or max scroll back buffer) and Xterm emulation. I think VT100 should also work and might be more appropriate. When you press space at...

The Heathrow ERS and Paddington ERS and Gossamer SW ERS and Gossamer HW ERS documents have more info about the feature control bits and the floppy signals. I think these can be found in the DingusPPC Discord's Documents channel. Open in Preview.app and search for floppy|mfdc|mfm|gcr

Looks like you pasted the code twice after the dl command? You should not see the code being pasted during dl. Maybe I should have added a message to the end of the pasted code to immediately show that the dl command does something. Add this to the end of the pasted code. Then, when you press...

Read the feature control bits with this: F3000038 rl@-flip 8 u.r which works without opening the PC floppy device in Open Firmware.