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Firmware for Mac ROM SIMM programmer

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Doug Brown 7425af761a Break out code into a HAL, optimize flash operations This makes the code pretty easily portable to other architectures if someone wants to make a more modern SIMM programmer. I also was pretty careful to split responsibilities of the different components and give the existing components better names. I'm pretty happy with the organization of the code now. As part of this change I have also heavily optimized the code. In particular, the read and write cycle routines are very important to the overall performance of the programmer. In these routines I had to make some tradeoffs of code performance versus prettiness, but the overall result is much faster programming. Some of these performance changes are the result of what I discovered when I upgraded my AVR compiler. I discovered that it is smarter at looking at 32-bit variables when I use a union instead of bitwise operations. I also shaved off more CPU cycles by carefully making a few small tweaks. I added a bypass for the "program only some chips" mask, because it was adding unnecessary CPU cycles for a feature that is rarely used. I removed the verification feature from the write routine, because we can always verify the data after the write chunk is complete, which is more efficient. I also added assumptions about the initial/final state of the CS/OE/WE pins, which allowed me to remove more valuable CPU cycles from the read/write cycle routines. There are also a few enormous performance optimizations I should have done a long time ago: 1) The code was only handling one received byte per main loop iteration. Reading every byte available cut nearly a minute off of the 8 MB programming time. 2) The code wasn't taking advantage of the faster programming command available in the chips used on the 8 MB SIMM. The end result of all of these optimizations is I have programming time of the 8 MB SIMM down to 3:31 (it used to be 8:43). Another minor issue I fixed: the Micron SIMM chip identification wasn't working properly. It was outputting the manufacturer ID again instead of the device ID.		2020-11-27 00:16:35 -08:00
.settings	Fixed bug that screwed up reading after doing an electrical test.	2012-03-04 12:03:02 -08:00
drivers	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
hal	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
tests	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
.cproject	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
.gitignore	Ignore local settings files. Get project compiling on my computer.	2020-11-27 00:16:35 -08:00
.project	OK -- so I separated the actual port code from the external memory controller code. I think this makes more sense.	2011-11-27 00:01:29 -08:00
chip_id.h	Added GPL header to all of my source files.	2012-05-25 20:21:04 -07:00
led.h	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
LICENSE.txt	Added GPL license text file.	2012-05-25 22:41:15 -07:00
main.c	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
programmer_protocol.h	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
README.md	Update README.md	2020-11-26 23:41:14 -08:00
simm_programmer.c	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
simm_programmer.h	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00
SIMMProgrammer-AVRStudio.atsln	Added AVR Studio project file for SIMM Programmer firmware	2016-04-25 13:48:59 -07:00
SIMMProgrammer-AVRStudio.cproj	Added AVR Studio project file for SIMM Programmer firmware	2016-04-25 13:48:59 -07:00
util.h	Break out code into a HAL, optimize flash operations	2020-11-27 00:16:35 -08:00

README.md

Description

This project is a bootloader and firmware for a Macintosh ROM SIMM programmer, along with control software for Mac OS X, Windows, and Linux. The ROM SIMM is compatible with the SE/30, all II-series Macs with a 64-pin SIMM socket (should include the IIx, IIcx, IIci, IIfx, and IIsi), and the Quadra 700.

This particular repository contains the main firmware that runs on the programmer board. The current compiler version used with this project is avr-gcc 4.8.2. Using a different version of gcc may result in worse performance due to some very tight optimization performed on this project to decrease programming time.

Downloads

Binary downloads (originally from Google Code) can be found at https://github.com/dougg3/mac-rom-simm-programmer/tree/downloads/downloads

Repositories

The project is spread over a few repositories. Some of them have a wiki.

Repository	Repository location	Wiki location
Programmer Firmware (AVR microcontroller)	https://github.com/dougg3/mac-rom-simm-programmer	https://github.com/dougg3/mac-rom-simm-programmer/wiki
Bootloader (AVR microcontroller)	https://github.com/dougg3/mac-rom-simm-programmer.bootloader
Programmer Software (Windows/Mac/Linux)	https://github.com/dougg3/mac-rom-simm-programmer.software	none
Windows Driver (.inf file, not needed on Windows 10)	https://github.com/dougg3/mac-rom-simm-programmer.windriver	none
Custom QextSerialPort for Programmer Software	https://github.com/dougg3/doug-qextserialport-linuxnotifications	none
QextSerialPort base	https://github.com/qextserialport/qextserialport	https://github.com/qextserialport/qextserialport/blob/wiki/Welcome.md
CAD for programmer, along with 2 MB and 8 MB SIMM PCBs	https://github.com/dougg3/mac-rom-simm-programmer.cad	none
Mac ROM patcher	https://github.com/jpluimers/macrompatcher/ (from https://code.google.com/p/macrompatcher)	none

Videos

ROM SIMM

What	Where
IIci booting from ROM disk	https://www.youtube.com/watch?v=SEFcQRmYtBI
Mac IIci Modified (Slower) Startup Chime	https://www.youtube.com/watch?v=lyIIRtR3Aw0
Playing with IIci ROM - other death chimes	https://www.youtube.com/watch?v=mlmt1AealLo
Mac IIci with a newer Mac's startup chime	https://www.youtube.com/watch?v=bRJtMMYCf0E
Mac IIci with Super Mario Bros startup chime!	https://www.youtube.com/watch?v=omL7mx0zxvI
Mac IIci Mario Startup Chime Part 2 -- Long!	https://www.youtube.com/watch?v=Yen0omvBo2Y
Mac IIci - Another Custom Startup Chime	https://www.youtube.com/watch?v=1R4W3mApAio