Скачать с ютуб AMIGA 1200 ACA 1221 Blizzard 1230IV Indivision AGA MK2 inspection в хорошем качестве

AMIGA 1200 ACA 1221 Blizzard 1230IV Indivision AGA MK2 inspection

From icomp.de: Indivision AGA MK2 Flickerfixer for Amiga with AGA chipset Indivision AGA MK2 features a faster FPGA, faster memory, more flexible pixel clocks and most importantly: DVI-I output. In addition to that, the shape of the A1200 version was changed in order to also fit inside the A4000T. A special version for A4000D and CD32 was manufactured in very low quantity. The current version is called Indivision AGA MK2cr. It is currently only available for A1200 computers. Use in an A4000T is only possible if electrolytic capacitor CE164C (located on the A4000T motherboard) is replaced with a lower-profile ceramic cap. The DVI-I output of Indivision AGA MK2 is available on the main flicker fixer on an edge connector. The first release of the AGA MK2 used a daughterPCB with protection diodes on them. The pinout is shown in the pictures on the right. Note that pin#17 is Vcc unfused. Pins 11, 13, 15 and 19 are GND. The MK2cr version has moved the protection diodes to the main flicker fixer board, and changed the connector to a 20-pin raster-2mm boxed header. The actual pinout remaines the same, but for your convenience, the pinout is shown on the right. ACA1221 ACA1221 is an accelerator for the A1200 computer. It is also compatible with the ACA500 and ACA500plus. Key features are: processor: MC68020-16 two clock ports 9 MBytes 32-bit fast RAM (expandable to 63MByte) Maprom option variable clock speed fully PCMCIA-friendly Before you install your card, you should check that the jumper is in "idle" or "park" position. It may have been left in "trial" position after quality control, and you may lose valuable trial runs with full licensing if you keep it in that position. In jumper position "trial", all features of the card will be unlocked. The computer can be started in this configuration up to ten times - the ACA1221 will count power cycles, not resets. You can run the computer for an unlimited time and reset it as often as you want. The numer of trial runs left is only decremented on power cycles. Jumper position "unprotect" is only required for adding or removing a license. You may need to bend the jumper pins up in order to fit the jumper in this position. clock ports (thumbnail) ACA1221 with expansions The ACA1221 features two clock ports for adding hardware expansions. The first clock port is mainly meant for an RTC module. As opposed to earlier accelerators with an RTC port, this port is a straight copy of the internal clock port of the A1200. That means you can also use it to connect a Catweasel MK2, Silversurfer or Delfina card. In that case, the internal clock port of the A1200 may not be used for such an expansion, but can be used for an RTC module. This male clock port is extremely useful if you own an early A1200 mainboard that has the clock port assembled in the wrong position. Note that if you want to use the internal and the ACA1221 male clock port at the same time, you may only use one RTC module and one clock port expansion card, but you can never use two RTC modules or two clock port expansions at the same time. The second clock port of the ACA1221 is independent of the internal clock port of the male clock port. This means it can be used in addition to any clock port device and/or RTC that occupies the other clock ports. The female clock port has been designed for the RapidRoad USB host controller. A clock port cable is not required; the card must be pluged directly to the ACA1221 as shown in the picture. A polarity "nose" helps avoiding connection mistakes. For passing power to RapidRoad, the white power output of the ACA1221 can be used. If you already have a RapidRoad inside your A1200, we recommend to use this dedicated port instead, as it is considerably faster than the "normal" clock port: You will get over 1MByte/s performance from USB mass storage devices, if the highest overclocking rate of the ACA1221 is enabled. The second "female" clock port uses memory address 0x00d90001. startup behaviour The ACA1221 may start up with a red screen in some cases. This may happen on a cold-start or after a reset. This is not an issue, as it will not keep the system from starting at all; it's just a property of the card with certain A1200 motherboard revisions, and it's perfectly normal behaviour. clocking and overclocking The ACA1221 starts up at it's slowest speed of 9.46MHz. After Autoconfig operations have been completed, the CPU clock will be increased to 17.03MHz, and caches will be enabled. This has been implemented in order to give harddrives enough time to spin up and be available after a cold-start, even under Kickstart 3.0. If you have purchased an overclocking license, you can set 21.28 or even 28.38MHz clock speeds. Please use the ACAclock tool to set the speed, or the ACAgov CPU governor to automatically set the CPU speed according to CPU speed requirements. More info at icomp.de