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What a surprise! That's crazy. I would never have believed that.

Also... no Color QuickDraw in them SE ROMs.

Congratulations!

Thank you for the follow up. This makes a lot of sense, since the chip is written to 16-bits at a time. To reverse the process, either flip 16-bits at a time, or flip the bits of each byte and flip byte pairs. That Python code is nice and simple.

I just looked more carefully at the picture of your card and realized how many different 'Thunder' cards there are. Ignoring the additional terms such as '8', '24', 'GX', 'GT', '1152', '1360', '1600', there seem to be at least five different generations of 'Thunder' cards. NUBUS SuperMac...

The printed SuperMac Thunder II GX Product Update Notice says: I recognize you are asking about the Thunder (I), not Thunder II. Also, I recognize the SuperMac is less than helpful in providing only a single sentence, rather than an explanation about what exactly is not compatible. FYI. You...

Yes. Agreed. All three examples print as straight 7-bit ascii after having the bits reversed in each byte. However, the first example "Golden Software" needs its byte pairs swapped as well. I don't know if that got written using a different process. In any case, cool work on REing the NVRAM.

I have good news, but also something weird that probably has a simpler solution. First, after reversing the bit order for LSB/MSB, the data is just the lower 128 characters of ASCII. Nothing fancy. Just mask out the top bit (end of string bit) and print the character. You don't need special...

Very cool detective work. However, I don't quite understand the bit pattern. In your post, you say the char data offset is bits 1-4. That only allows for 16 characters. in your code, you seem to be using bits 1-5 (aka 0-4) which would provide 32 characters (minus 1 for the special case space)...

I have a number of Quadra 630 computers. Recently, I picked up a spare board that motivated me to take a closer look at some of the differences. Thus far, I have found three different boards in Quadra/LC 630 series of computers: 820-0548-B (the most common). One double-bank RAM slot. One...

Yes! It is my hope that people will replicate as much of the software, manuals, and knowledge into as many public repositories as possible. I think we all recognize that any single site can disappear from the internet without warning. I am glad to be part of a community that recognizes the value...

Good advice and video. This year, I wrote an application that combines the BinHex (.hqx) file converter and communication software. It works on all Macintosh computers from System 1 to System 9, including emulators. And, like in the video, you can use any terminal application on a PC or modern...

That's incredible! Good write up. Thank you for sharing this.

Just to be clear, the modem port will work fine. That resistor is part of the board as shipped by Apple. So, don't remove it.

That is R8 100K which pulls RXD+ high (to 5V) on the modem port. This would provide a default signal to prevent electrical noise from being interpreted as incoming data. The modem port is serviced by an interrupt (unlike the printer port in early Macs), and thus false incoming data could...

I'm surprised (pleasantly) that it works in OS 9. BTW, I noticed that async calls to the serial driver cause Basilisk II to stutter.

Inside Macintosh claims the SCSI manager is not capable of asynchronous operation. Furthermore, any call that requires a memory allocation also does not work asynchronously. When you pre-read the file using Resourcerer, it is likely fitting into the cache. This would avoid calls to the SCSI...

Yes, I strongly considered it. Zmodem definitely has higher performance than Xmodem, as well as the ability to continue an interrupted file transfer from where it left off. The power of Zmodem is that it uses a file offset rather than arbitrary packet numbers with ack/nak. That way you can tell...

Hello everyone, For bulk file copying on older Macs, nothing beats emulated hardware such as Floppy Emu, MacSD, ZuluSCSI, and so on. However, for sending small files back and forth, swapping the micro SD card in and out can feel a bit like sneakernet. I've written a small application that runs...

Awesome! That is so much better. I have no doubt that if we can hear the difference (we can) then we can measure the difference. Here are the other steps from my earlier post. Basically, the methodology is to find pairs of test points up and down the sound chain. Hopefully, by comparing the...