ACA-1221 Budget 68020 Accelerator Card
for Amiga 1200 and Amiga 500 with ACA-500
The Basics
The ACA-1221 is a low cost accelerator card for the Amiga 1200
and the Amiga 500 with
ACA-500 or
ACA-500plus expansion,
mostly aimed at classic gamers. The basic configuration comes with
68020 CPU that can be configured to run at 9.46 MHz or 17.03 MHz.
Since it offers 9 MB RAM right from the start and mere 8 MB expansion
cards are usually more expensive than the ACA-1221, there's hardly
any excuse left not to upgrade your Amiga right away. :-)
The Upgrades
The ACA-1221 takes a new approach regarding upgrades. Future upgrades
are basically already present on the card, and the customer can buy
a licence code to activate additional memory, overclock the CPU or
enable the MapROM function. Upgrade options can be tried by the user
at no cost. Up to ten trial runs of unlimited time can be made, so
overclocking stability can be verified before actually purchasing
the licence code.
Technical Data
- Processor:
full MC68020, plastic PGA package, 16.67 MHz rating,
used processors that are possibly scratched
- Memory: 9 MByte, expandable to 17 MByte, 33 MByte or 63 MByte at extra cost
- Speed: 9.46 MHz or 17.03 MHz user-settable (standard with all cards)
- Overclocking options: 21.28 MHz or 28.38 MHz at extra cost
- MapROM: 1 MByte MapROM option at extra cost
ChipMem access speed has been greatly improved in comparison to the
ACA-1220,
which will help eliminating the so-called "Turrican slowdowns"
and other WHDload game hickups. Although the card is running asynchronously
to the A1200, synchronous ChipMem speed can be achieved.
Expansion Ports
The ACA-1221 features a generic clock port for the
real time clock module
or any clock port device. This clock port is a straight copy of
the internal A1200 clock port. One RTC module and one other
clockport device may be used concurrently (but not two clockport
devices). This is very useful for A1200 boards that do not have
the correct clockport assembly (early commodore boards).
The second clock port on the card was designed especially for
RapidRoad:
It is considerably faster than the standard clock port and thus
allows higher USB transfer rates. There is also a power connector for
RapidRoad which lets the user install a USB card without opening the
computer. This port may also be used for a
Subway USB controller.
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