Search results

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.

The rev D ROM does have support. Check the Heathrow feature control bits (32-bit register at offset 0x38 of the mac-io device). /** O'Hare/Heathrow specific registers. */ enum { MIO_OHARE_ID = 0x34, // IDs register (MIO_HEAT_ID) MIO_OHARE_FEAT_CTRL = 0x38, // feature control...

I think it does all the things the Z8530 SCC can. Same register set for all 68K and PowerPC Macs which include an SCC. https://68kmla.org/bb/threads/localtalk-but-faster.45615/post-505309 I'm not sure what you mean by RS422 signals. RS422 has differential pairs while RS232 has a single line...

LC III's gestalt ID is 27? aka gestaltVail? The flasher has these 5 options for that gestalt ID: - Intel 28F020, write: 40400000 read: 40800000, 2 banks, 1 MiB each, not PDS (040, also works on Quadra) - AMD 28F020, write: 40400000, read: 40800000, 2 banks, 1 MiB each, not PDS (040, also works...

Since you have a ROM slot, it is possible for a ROM module to exist. I don't have a list of everything Apple made so I can't say if Apple did or didn't make a ROM module.

Asking me to prove a negative?

level shifter?

Wouldn't the G3 DIMMs be wired similar to PowerSurge DIMMs (except the voltage source)? Schematics at: https://bitsavers.org/pdf/apple/powerpc/PowerSurge/ROM_Flasher/ G3 and PowerSurge/TNT/8600 schematics are at: https://www.macdat.net/repair/apple_schematics.html Both G3 and PowerSurge...

The Macintosh Portable schematics have a slot named ROM and labeled J10. It's 16 bits wide and has 23 address bits (excludes address bit 0 because it's 16 bits wide) similar to RAM slot J11. This is for the M5120 (non-backlit). I don't have schematics for M5126 (backlit) version...