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Old 26 January 2011, 22:35   #16
Photon
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Join Date: Nov 2004
Location: Hult / Sweden
Posts: 4,452
I figured out what the card would be a few days ago and apparently got it right When I discovered the thread on a1k.org I got pleasantly surprised, because it seems to get two more features, 68000 fallback and possible support for more turbo cards than his ACA1230.

This is what I deduce as preliminary specs, Jens let me know if I read something wrong or specs have changed.

Specs:
CPU: 14 MHz 68020 (not 68EC020)
RAM: 8MB non-SDRAM asynchronous fastram

Performance:
- likely slightly under a synchronous-memory 14MHz 68020-card (conjecture by me from talk in the thread)
- chipram access speed 3,5 MB/s (no FastChip etc)

Interfaces:
- IDE non-DMA interface supporting f.ex. 1 CF card + 1 CD-ROM. Max rate is 8 MB/s, though real-world performance will likely be quite a bit lower.
- Clockport

A1200 adapter:
- Allows 68000 fallback (whole accelerator with IDE and fastram switched off)
- Plug in A1200 turbo card here (kills 68000 fallback)

Edit:
The idea for the adapter is to remove the 68020, plug in the adapter, and plug turbo card into it.

Known non-working turbo cards are Apollo 1240 and 1260 (due to their handling of 16-bit addressing). No warranty for ACA520+Turbo card "combos". (Except I presume for ACA520+ACA1230 combos.)

Side "HDD/RAM" expansions:
- "Throw them away. They are slower anyway." (abbreviated short-hand by me from Jens's posts). Known non-compatible ones are M-Tec and CBM A570/590.

Models:
A500: fits.
A1000: fits if floppydrive is removed.
A2000: fits if floppydrive bridge removed.
Edit:
CDTV: Jens posted that DMA-compatibility would make the card 40 EUR more expensive and still slow, and won't fit under the cover [plate]

(no more models were mentioned that I can see. Edit: as in - addressed by Jens, with regards to actually fitting them inside, that is.)

Availability:
- Germany: end of March 2011. (he will make Indivision AGA MK2 first)

Edit:
Price:
- under 100 EUR

Kickstart:
- no onboard ROM sockets
- MapROM possible - only if 32-bit ram possible which is awaiting testing and not known yet.


Wow!

Edit: made a crappy mock-up guess / dream ...
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Last edited by Photon; 27 January 2011 at 01:50. Reason: added some more info
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