| [News] Announcement: Technical data of the new Catweasel MK4 | ANN.lu |
| Posted on 18-Jul-2004 12:20 GMT by Jens Schönfeld | 469 comments
View flat
View list |
During the first months of this year, we were totally surprised by the overwhelming demand for Catweasel MK3. All stock has been sold, and even our retail partners do not have anything left in stock. The demand was so high that one controller even went for more than 150,- EUR on eBay!
Unfortunately, it turned out that a new production run of the existing MK3-design cannot be done for reasonable prices, so a re-design became necessary. The new controller is now in the first stage before mass production, so we're confident to be able to show the first controllers at the Amiwest show on july 24th and 25th in Sacramento, Califoria.
Many improvements have been made compared to the Catweasel MK3 that can be summarized under the headline "bigger, better, faster".
The changes in detail
The most obvious change is the size of the card: With only 2.5 inch (63.5mm) height, it complies with the low-profile PCI standard that not only fits into any normal computer case, but also in flat models that are so famous among so-called "case-modders". The Flipper-interface will not be continued. Those who need a Catweasel for their classic Amiga can use the Catweasel Z-II S-Class, which is still availble.
Improvements on the floppy controller
Kylwalda built in
While the old Catweasel models always had their own floppy drives that were installed in addition to the existing controller and drives, the MK4 has the option of using the existing diskdrives. After the machine has started, th drives can be used just like before, and after the drivers have been loaded, the Catweasel can take control of these drives when necessary. This is especially useful for smaller cases with fewer drive bays.
We already addressed this problem earlier with an additional product called 'Kylwalda'.
Suppot for auto-eject drives
These drives without eject-button are well-known from Macintosh computers, and they're now fully supported by the Catweasel. You can also mix floppy types, one with an eject-button, and another from the Macintosh world on the same cable.
Hard-sectored disks supported
This kind of 5.25 and 8 inch disks were already readable with the previous Catweasel models, but writing was only possible with a high software effort, and it required a realtime operating system. This effort is not necessary any more with the new controller, because new options allow complete support of these disk types in hardware.
dual-ported memory
Contrary to it's predecessors, the new Catweasel MK4 can pass the data that it is currently reading from a disk to the computer while the read access is running. This allows realtime emulation, and errorfree function of copy-protected software on emulators.
more flexible read- and write operations
In addition to working on whole tracks, which made all previous Catweasel models so flexible, tracks can now also be accesed in part very precisely. Should this become necessary for compatibility or speed reasons, the Catweasel MK4 is perfectly prepared.
extensive timer-functions
Although most operating systems already offer timer-functions in software, you cannot always rely on them. The most recent example are the timing-problems that occur with Hyperthreading-processors and Windows operating systems. Since all timers are running independantly in the hardware of the Catweasel MK4, nothing can go wrong in this regard.
all events can trigger an interrupt (IRQ)
Together with the hardware-timer functions, this is the best solution for multitasking operating systems. The driver software does not have to check regularly if the controller needs attention, which reduces the processor load.
Improvements on the keyboard interface
In addition to Amiga-keyboards, PS/2 devices can now also be connected. Not only keyboards, but also PS/2 mice are supported. The keyboard controller can now trigger IRQs, and for those customers who want to continue using their favourite combination of PS/2 mouse and keyboard on USB-only computers, the Catweasel MK4 has two connectors of this kind.
Improvements on the joystick ports
Amiga mice supported in hardware
Amiga mice only have minimal electronics that always pass the movements of the device to the computer in realtime. Classic Amiga computers have hardware-support for interpretation of these signals in the chipset, and this support has now been added to the Catweasel. Theoretically, using Amiga mice was already possible with the Catweasel MK3, but this required a software effort that was not justifiable. With the new hardware, the software effort is reduced to a minimum.
every signal can be programmed as output
The digital joystick ports of the 8-bit computers of the 80s were mostly usable in two directions, they were not only inputs, but also programmable as data outputs. We're following this tradition, and also present this possibility for the Catweasel MK4.
compatible with CD32 pads
The game controllers of the Amiga CD32 can now also be used on the Catweasel. A special capability of the classic Amigas (and therefore also of the CD32) made these pads exclusive for this computer, if connected to other computers, not all buttons of the pad could be used. Technically speaking: Even the potentiometer-pins of the digital joystick ports can be programmed as outputs on the Catweasel MK4.
Improvements on the SID audio part
DC-DC converter eliminates noise
On the Catweasel MK3, it was possible that noises from 3D-graphics cards or high-speed harddrives were coupled into the 12V-power supply of the SID audio part. This cannot happen any more on the Catweasel MK4, because a DC-DC converter is an insuperable obstacle for such noises.
cycle-exact control
In addition to the known programming that's compatible with the Catweasel MK3, the MK4 has a sophisticated script-language for SID control. This lets the programmer define the exact time for data that's being written into the SID chips. To make sample playback sound exactly like on a real C64, the data rate to the SID chip must be kept at a constant rate. This is accomplished with Fifo memory that's big enough to maintain the datarate even under high processor load conditions.
Digiboost for new SID versions
As opposed to the 'classic SID' 6581, the newer SID-chips 8580 and 6582 cannot playback samples any more. This option, which is also called 'the fourth voice', is replaced by two sigma-delta converters on the Catweasel MK4, so the fourth channel is also audible with the newer SID versions. Since the filter properties and the sound of mixed waveforms of all SID versions have their supporters, this should make the decision for the right chip a little easier.
Filter capacitors selectable
Commodore has defined three different capacitor values for the filters of the SIDs during the years that this chip has been produced. The result was that the same chip sounded differently if used in different computers. To bring the sound as close as possible to what you are used to, the filter capacitors can be chosen with a few jumpers.
precise clocking
The Catweasel MK3 used the commodore-chip 8701 to recreate the exact same clock. Since our stock of this chip is empty with the Catweasel MK3 being sold out, we have cloned it on the main logic chip of the Catweasel MK4: The exact base frequency is generated with crystals that have been made especially for us. By division and multiplication according to the specifications of the C64 schematics from 1982, we managed to replace the 8701, which is not made any more. Even the slight difference between PAL and NTSC computers is software-selectable!
two SIDs for stereo sound
You'll have twice the SID pleaseure after installing a second SID chip. Every SID has it's own selection of filter capacitors, and SIDs of all versions can be mixed.
Technology improvements
compatible with 3.3V and 5V PCI slots
Even though PC boards with 3.3V PCI slots are not yet widely available, the Catweasel is prepared for it. The roadmap of the PCI special interst group plans to abandon 5V PCI slots within forseeable time, and the Catweasel is perfectly suited for that date. Local generation of the 3.3V power also ensures proper function on early PCI motherboards that do not comply with the ATX standard.
two DMA interfaces
In addition to processor-based data transfer, the Catweasel MK4 can excahnge data with the main system through two low-speed DMA channels: The first goes throught he PCI slot, and it has a capacity of about 8K per second and direction. The second uses the direct connection to the onboard-floppy controller, and the speed is up to 100K per second.
low power consumption
The Catweasel MK4 makes use of the latest FPGA technology with 2.5V core voltage. This reduces the power consumption of the new controller to a fraction of what the Catweasel MK3 used. This also reduces heat generation a lot.
re-configurable logic
The FPGA on the Catweasel MK4 is completely re-configurable by the drivers. This means that a hardware update can be done through the internet! Should we find a disk format that cannot be handled with the current hardware, the core of the Catweasel can be 're-wired' to address the problem. The controller doesn't even have to be taken out of the computer for ths update!
drivers for many operating systems
The Catweasel MK4 is delivered with drivers for Windows 98(se)/ME/XP/2000, Amiga OS4, and for Mac OS X at a later date. MorphOS drivers are available for a surcharge.
The Catweasel MK4 will be available starting october 2004.
The target retail price is 99,- EUR.
|
|
| List of all comments to this article |
| Announcement: Technical data of the new Catweasel MK4 : Comment 177 of 469 | ANN.lu |
| Posted by Johan Rönnblom on 19-Jul-2004 16:39 GMT | In reply to Comment 130 (Stefan Burström):
Stefan Burström wrote:
[About the Pegasos 2]
> The USERS of a cheap, subsidised mainboard [...]
Well, of course you're entitled to speculate, but I find it quite arrogant and not very sympathetic to state for a fact something which you really have no idea about.
We all know that the Pegasos consumer sales do not wholly finance development and research. However, you go further than this, claiming that each board sold would actually be a loss.
I think you're missing quite a few factors which make cheap production possible in the Pegasos case. Let's compare it to the A1 for example, which is a very similar product technically and with regards to volumes.
- Considerably smaller board.
- No major licensing costs involved, in-house design.
- Very little organisational overhead, more or less two people (Carda + Knäbel) design *and* produce the units.
- Convenient production: as Carda previously (co-)owned the production equipment, they can operate it themselves and don't need to pay anyone externally to do this.
- Small sale- and resale organisation, bPlan ship directly to dealers.
When you compare this to the A1 which involves not only MAI but also a third party which designed the board, AND manufacturing facilities, AND several layers of sale and resale, it's no wonder that the Pegasos is much, much cheaper. Just count the number of people each board has to feed.
Also, of course you can't compare this to the cost of letting a third party company produce a board you designed. In such cases, you will of course pay an overprice as is the case for all consulting work - and more overprice the more qualified work, it should be noted.
Now as I said, of course you can speculate. I personally always found it funny that BAFs manage to turn even the low cost of the Pegasos into a disadvantage, but anyway.
I could also speculate about how I find it likely that A1 production will cease because MAI don't seem to be able to get a marketable product out the door. Both they and Eyetech are pointing to Linux as their avenue for sustainable revenue, but nowadays everyone agrees that there is no working Linux for the A1/Teron - and there seems to be little visible effort made to rectify this. MAIs dates for new northbridge products are repeatedly pushed forwards. No one seems to be able to name any existing MAI customers, and even Eyetech are no longer directly reselling the A1. Well, doesn't look good to me. But I wouldn't run around telling people that production and sales of the A1 is not commercially viable, as I really don't have any knowledge about the matter.
Also, regarding Jens' disagreement with BBRV: I don't think even Jens claims he did work for Genesi. What Jens did was to organise a fair in Aachen. Fortunately for him, Genesi agreed to pay a considerable part of the costs. The disagreement is, as far as I've understood it, over the cost of an additional hotel room rented by Jens. I've only heard BBRV's version in detail, I've asked Jens about it but he will not answer.
As BBRV don't seem to have a problem with admitting when they owe people money (as with me or Dale Rahn, and I believe also Christian Kemp as have been named publicly, and several others unnamed) I think this case is rather different. Due to the let's say, "less than constructive" attitude displayed by Jens, I'm not really inclined to buy his version, especially when he doesn't even want to give it in any detail. |
|
| List of all comments to this article (continued) |
|
- User Menu
-
- About ANN archives
- The ANN archives is powered by #AmigaZeux. It was updated daily (news last: 22-Oct-2004; comments last: 18-May-2005).
ANN.lu was created, previously owned and maintained by Christian Kemp, www.ckemp.com.
- Contribute
- Not possible at this time!
- Search ANN archives
- Advanced search
- Hosting
- ANN.lu was hosted by Dreamhost. Sign up through this link, mention "ckemp" as referrer and he will get a 10% commission on any account you purchase.
Please show your appreciation for any past, present and future work on ANN.lu by making a contribution via PayPal.
|
