Homebrew 68k computer with V9990

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By hbarcellos

Hero (515)

hbarcellos's picture

11-09-2013, 22:15

Quote:

CPU MC68008, clocked with 10MHz
RAM 4MB DRAM, 512kB dedicated VRAM
Video Yamaha V9990 Video Display Processor
Audio dual SID stereo (MOS6581 or MOS8580)

Sinclair QL uses the same CPU with a clock of 7.5 MHz.
Amiga 500 used 68000 at ~7.15 MHz. As far as I remember, AmiMSX was running fine on it.

By Capitan_Goto

Master (144)

Capitan_Goto's picture

12-09-2013, 12:52

@Hbarcellos...about running MSX on Kiwi...that would be superb!. If isn´t possible to see a "pure MSX" Kiwi, at least emulate it sounds great. The computer looks beatiful to me...i love the "all black" Tongue case....

By the way Bogo...there is any way to get that case?. Do you have any file with the measures or plain or something like that? Very good job, Bogo

By PingPong

Prophet (2586)

PingPong's picture

15-09-2013, 09:32

jltursan wrote:

That's why I asked Bogo about the CPU speed time ago. At first I've thought, "nope, right now the 68000 doesn't give too much room to emulate anything"; but then I've remembered the Amiga emulators and how good they're (and I'm talking about a 68000 at 7Mhz).

The 68000 used is a stripped down version of the amiga one. With a 8 bit bus. Performances are influenced by this factor.

By Bogogil

Expert (125)

Bogogil's picture

16-09-2013, 10:08

Hi,

no, unfortunately I haven't a file with the measures. But you could easily adapt it to your own needs. There is a thread about the case in my forum where I describe how the case has been built. It is a lot handcrafting though. Smile

Well, I don't really want to emulate things. I prefer to port software. This makes more sense as it will be faster and one can fit the software better to the hardware. EmuTOS is a big leap towards portability but it doesn't emulate anything. Everything written for special hardware doesn't run. But I could think of clean GEM applications and even games running once the VDI has been ported. As far as I know "Simcity" is a clean GEM game.

Bogo

By hbarcellos

Hero (515)

hbarcellos's picture

16-09-2013, 14:49

You mean, currently you're able to run this software on Kiwi?

Maybe, then, you could create a Windows Kiwi emulator! :) Then, people could start creating sw for it...

By Bogogil

Expert (125)

Bogogil's picture

16-09-2013, 15:12

Oh no. That is what I want. For the GEM (graphical) part of EmuTOS I will have to port the VDI too. ATM I have a working console-only EmuTOS. Here is an early video (without VT52 and color output - both working since last week): http://www.youtube.com/watch?v=58-l_cGrl9A

Yeah, but an emulator alone is much work and I have to admit that I prefer to work on the real thing. :)

Bogo

By hbarcellos

Hero (515)

hbarcellos's picture

16-09-2013, 15:43

That reminded me my crazy ideas from the past. Creating an emulator first, then, the real thing! Smile
Well, I never did an emulator before (...with the eventual exception of that Coleco sound chip...), but I think that in your case it would be a matter of taking parts from several different other emulators: Sinclair QL, C64 and so on...

Anyway, I wouldn't do the emulator either. Just chit chating... Smile Good luck with the VDI port...

By PingPong

Prophet (2586)

PingPong's picture

16-09-2013, 17:10

@Bogo: I've a question for you. You say that cpu is running @10Mhz. I also assume that, because of the hw design there is no VRAM-CPU contention. So assuming no-wait states the 68000 is at full power.

I know that a comparison as i ask you is meaningless, but can you compare the speed of 68008 with a normal 6510 @ 1Mhz? How do you expect in terms of speed factor? 3-5 times faster than a 6510 @1Mhz? just to have an idea of the estimated power.

By hbarcellos

Hero (515)

hbarcellos's picture

16-09-2013, 19:34

If you check the video he posted, at ~45s, he decompress a ~48k arc file. Doesn't look too fast.
But, I must confess I'm a little confused about all those CLI/EmuTOS/GEM/VDI and etc... Most probably unarc is running on the top of some other layers...

By Bogogil

Expert (125)

Bogogil's picture

17-09-2013, 14:11

Hard to say how fast the 68008 is compared to the 6502. ATM I have a little bottleneck in the CPU-V9990 interface. As far as my experience is, the V9990 is fast but the CPU often has to wait when writing consecutive bytes to the V9990 though. So fast is relative... I pretty much like the V9990 but I understand why it was an commercial flop. Smile

I would not use the decompressing as benchmark for the CPU speed. There are too many OS layers and overhead of the filesystem. Maybe I will benchmark the CPU later.

Bogo

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