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Hi, thanks for the link. I've finally managed to have a go at testing it, but it doesn't see this drive either. When you try any of the file options for copying or formatting (the only ones I've tried so far), it first scans for SCSI IDs, and in my case, with the 340MB HD that used to work, it...

:ROFLMAO: There's always a reason to liberate an ARM CPU ;-) ! Anyway, perhaps there's another way (@Phipli ): Modify the ROM so there's a back door that lets you execute ARM code directly. My guess though is one already exists because it's the kind of thing developers would do.

Weird. I thought that the clock input frequency on an ARM2 was twice the CPU frequency. However, they're right - a 10MHz VL86C010 can execute instructions at up to 10MIPs. The 6MIPs is only an average. Unfortunately, Radius left the window on their EPROM uncovered, so the QuickDraw speed-up...

Oh, right. I assumed it had its own frame buffer. But a standard 640x480 takes 300kB. A few months back I was playing with MAME’s SparcStation 1 emulator, which runs in realtime. The SS1 (May 1989) had a 20MHz Sparc, with only a multiply step operation (32c (1.6us). A 12MHz ARM2 would perform a...

I'm sure my memory is much worse! It's a 12MHz ARM2. It needs a MEMC chip to properly emulate an Archimedes, which it doesn't have. It looks like it's got a 256kBit ROM, which is 32kBytes (seems reasonable) and 256kBytes of video RAM. Because it's written in 1988, it'll only support 8-bit Color...

Interesting. What did you use to write it?

All you need is a new house now :-) !

Well done! I’ll try and check it out!

Thanks, very curious. Did @MrFahrenheit put it on Macintosh Garden?

The disk imaging apps on a Mac appear to be too clever, aiming to copy individual volumes and caring about the underlying file system. DumbDD copies sectors from a real SCSI HD, indexed by sector, using the SCSI Toolbox APIs, not the file system FS or PB routines. It can also copy them back from...

Hi folks, Another DumbDD update. I've been testing DumbDD on my PowerBook 1400c and a real 334MB Hard Drive. I initially used Disk Copy to save the image, which I can mount. I couldn't run the project using THINK C 5.0.4, because it looks like any project with MacTraps causes THINK C to crash...

What's a RIFA? (I have a feeling this is a really dumb question to ask).

The first Sparc CPU (V7) was the Fujitsu MB86900 in1986. This is the manual for the MB86901, which is also a V7. The introduction explicitly mentions a barrel shifter and later in the manual shifts are described as having 1 cycle...

I just threw that in. Many workstation applications were maths-heavy. An 8MHz ARM could beat a 16.7MHz SPARC for some DSP computations (mostly because multiplies were compiled as a library routine by default). True. ARM also had multiple load/store which could have helped 8bpp colour graphics...

Nice. Here's my video of my PS/2 to Quadrature-Encoded mouse conversion that I did for my 12MHz A3020 (6 MIPS). It shows me moving the paint tools palette around the screen along with the contents. You can also play with the Javascript multi-Archimedes machine emulator...

Although there may have been work in that area, it turns out the NeXT Step Dock (and Windows 95 taskbar) was derived from the first commercial implementation on the Acorn Archimedes' Arthur OS in 1987. (So, note, Arthur/RiscOS could drag windows around on a 4 MIPS ARM)...

Very impressive, and NASA plans to celebrate the occasion by sending 4 people on a Moon flyby :-) ! In just 40 mins... assuming they get the launch abort system battery issue sorted :-) !

On average I find that 1 line of code ≈ 10 bytes. So, 32kB ≈ 3200 lines, and at 50 lines per day(?) that's about 2 months solid coding. Yes. That's most of the difference, all the assets that form part of a modern application aren't actual lines of code written by a programmer. And there's...