Emulator Mess Force Mac To Boot From Floppy

Emulator Mess Force To Boot From Floppy Mac ROM SIMM#

By placing a setuid script in a mountable file system, e.g. Floppy insertion Mouse movement under certain environments isnt quite right (Ive optimized for Lisa Office System.) When the emulator quits, on OS X, it segfaults (crashes.) Wont work with Lisa 1 ROMs as there is little support for Lisa 1 HW emulation at this time.These SIMMs (and programmers) are available for purchase here.Im not sure the X-Force reference identifies this problem either. Some of the animation has color issues in some of the BMPs/XPMs - i.e.

12.Do things like, attach a cassete tape, a special cartridge, a floppy drive or. Downloads: 2 This Week Last Update: See Project. The goal of the project is to support the full command set of the TF-20 (Epson HX-20 support). The unit is used with the Epson PX-8 and PX-4 portable CP/M computers.

It works perfectly and allows you to create a 1.5 MB bootable ROM disk to append to the 512 KB IIsi ROM. However, bbraun came up with an even better idea вЂ” a ROM disk driver! He has patched the IIsi ROM (which should be compatible with the SE/30, IIx, IIcx, IIci, IIfx, and of course the IIsi itself) to enable booting from a ROM disk that uses up the remaining space on the SIMM and also has some other tweaks like disabling the slow RAM test that the previously-listed machines perform on every cold boot. The combination is pretty nifty and enables people to do all kinds of crazy things that previously werenвЂ™tВ possible.Create An SP2 Slipstreamed Boot CD 1 2 Install And Use The Recovery Console 1 2 HOW TO GUIDES FOR DOS AND WINDOWS 98 TuneUp Your Computer Learn How To Use Fdisk Make Your USB Hard And CDrom Drives Work In DOS AXS The CMOS Setup And Set Your Floppy Disk To Boot Make A DOS Bootdisk Get Your Mouse Working In DOSI always figured that the 2 MB size of the SIMMВ was plenty вЂ” I never really envisioned using the custom ROM SIMM for anything other than customizing the startup chime. Everything from the hardware design to the firmware is completely open source.

However, A0 and A1 are unused due to the fact that the data bus is four bytes wide, so there are really only 21 usable address pins. The 64-pin ROM SIMM slot has 23 address pins labeled A0 through A22. 4.2.1 The /kernels Directory on the Slackware CD-ROM 4.2.2 Compiling a Kernel.After he came up with that brilliant idea, I figured I should maximize the potential size of the disk image.

Everyone is moving towardВ 3.3V and lower.В After a ton of searching, I settled on the Micron M29F160FB5AN6E2, a 5V 16-megabit chip that can be accessed in parallelВ using either a 16-bit data bus or an 8-bit data bus. It turns out that 5V chips are becoming harder and harder to find, especially inВ larger sizes. After taking into account the 512 KB ROM size, that would leave 7.5 MB of usable space for a ROM disk.You can probably see where IвЂ™m going with thisвЂ“I designed a bigger ROM SIMM!First of all, I had to find NOR flash chips that ran on 5V and were big enough. Each address points to 4 bytes of data, whichВ provides for a total maximum ROM SIMM size of 8 MB.

So now it is possible to create a 7.5 MB ROM disk and boot from it. Here is the final product:Quickly after I finished the new SIMM, bbraun updated his driver to work with a 7.5 MB ROM disk. These chips really need to be soldered down, so this new SIMM requires my programmer board in order to put a disk image onto it. I use them in 8-bit mode so each of the four chips provides one of the four bytes per address, just like how I designed the 2 MB version of the SIMM.The chips are available in a fine-pitch TSOP package, which pretty much eliminates the possibilityВ of socketing them. In order to reach the full 8 MB size, I need four of them per SIMM. 16 megabits (Mb)В is equal to 2 megabytes (MB).

Unless someone discovers a way to get around that, those machines will probablyВ not be able to take advantage of the ROM disk. Unfortunately, itвЂ™s looking like they are hardwired to only address 1 MB of ROM space. As always, the 8 MB ROM SIMM is completely open source so you can make one yourself if youвЂ™d rather do it that way.Some newer machines like Quadras have pads on their motherboards for these SIMMsвЂ“you just have to solder on your own socket.

Emulator Mess Force To Boot From Floppy Mac ROM SIMM

You take the SIMM out of the Mac, put it into the programmerвЂ™s SIMM socket, plug the programmer into a USB port on your computer, and then run a program I developed that can write or read the SIMM. I recognized these problems and solvedВ them byВ creating a USB programmer board for the SIMMs. Having to do that over and over again will get old really fast, not to mention the fact that you need an EEPROM/flash programmer. Now IвЂ™m ready to share it!Remember the programmable Mac ROM SIMM I created earlier? ItвЂ™s nice and all, but itвЂ™s extremely annoying pulling the four chips out of their sockets and reprogramming them one by one.

Also thanks to others on the same forums for giving me PCB layout tips and helping me debug a scary problem that turned out to be a software error (thanks ojfd, bigmessowires, and Dennis Nedry!).The board uses an AT90USB646 microcontroller as its brains. The pinout is different.Although there arenвЂ™t currently any automatic ways to patch in a custom startup chime (this is planned though!), this board can still be useful if you want to tinker with the MacвЂ™s ROM or make a replica IIfx or IIsi ROM SIMM to make your SE/30, IIx, or IIcxВ 32-bit clean.HereвЂ™s what it looks like with one of my programmable ROM SIMMs in it:Credit goes to olePigeon on the 68k Mac Liberation Army Forums for creating the Jolly Roger graphic used on the SIMM and the programmer board, and for providing the 64-pin SIMM sockets (which are incredibly difficult to find). The Quadra AV models, some of which have a 64-pin ROM SIMM socket, do not work with the SIMM. Anything from that era with a 64-pin ROM SIMM socket should work fine.

The SIMM programmer appears as a virtual serial port to the computer, so thatвЂ™s why I use a serial portВ library. QextSerialPort вЂ”В a Qt library for interfacing with serial portsвЂ“I used a custom version that allows Linux device discovery and fixes a device discovery bug on Windows. Qt вЂ”В a cross-platform library that I used for creating the control software. IвЂ™ve made extensive use of other open source stuff for this project, so I should probably share everything that I used for creating this project: I only had 12В of thoseВ boards made, so there arenвЂ™t many out in the wild рџ™‚Everything IвЂ™ve done for this project is open source, from the PCB layouts to the programmer firmware to the control software.

ItвЂ™s OK вЂ” the programmer software stays completely happy if the board is plugged/unplugged while itвЂ™s running. Just play it safe and only plug/unplug the SIMM while the programmer board is unplugged from USB. DonвЂ™t plug/unplug the SIMM from the programmer board while the programmer board is powered.В I didnвЂ™t add any protectionВ and IвЂ™m pretty sure itВ would beВ ridiculous to try to protect against that stuff. It made it very simple to create a virtual USB serial port on the AVR.All of the code, compiled binaries, and PCB schematics/board layouts are available at the Google Code projectВ site. Without this project it would have been ridiculous trying to make the programmer firmware.

Just to be clear, this board is NOT capable of programming stock Apple ROM SIMMs. You can also click a button toВ electronically read manufacturer and device info from the flash chips to verify that they are responding correctly. If you suspect something is messed up on a SIMM, the software provides an electrical test function to make sure none of the SIMM pins are shorted to each other (with the exception of shorts to +5V вЂ” sorry, canвЂ™t test that without pull-down resistors!). If itвЂ™s too loose, IвЂ™ve seen some of the chips fail to read and write properly. Some of the SIMM sockets donвЂ™t perfectly fit the SIMM, but they should still work if everythingвЂ™s pushed in firmly.

As I mentioned earlier, the board is also not capable of programming my initial version of the ROM SIMM that did not have the Jolly RogerВ graphic on it. To be safe, only use the programmer with my programmable ROM SIMM. If youвЂ™re careful, you may be able to read those SIMMs (do NOT try to do anything that does a write cycle, thoughвЂ“you may damage the programmer, the ROM SIMM, your computer, or any combination of the three).

Emulator Mess Force Mac To Boot From Floppy