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A3000-16
A3000-25
A3000UX
In 1990 Commodore released its
first 32 bit system featuring the ECS chip set. The first models had 16 MHz
motherboard, later 25 MHz.
The A3000UX is based around the 25 MHz model. It shipped with AT&T Unix
System V Release 4 operating system instead of AmigaOS, a three button mouse,
and usually with the A3070 tape streamer, the A2410 graphics card and the A2065
Ethernet card installed.
68030 @ 16-25 MHz
68040 @ 25-40 MHz
68060 @ 50 MHz
PowerPC 604e @ 150-233 MHz
All A3000 has a 68030 processor
and a floating point unit soldered to its motherboard. The A3000-16 uses 68030
and 68881 @ 16 MHz while the A3000-25 uses 68030 and 68882 @ 25 MHz. Upgrading
the processor requires the use of a processor card.
The A3000s shipped with empty processor card slots.
up to 2 MB Chip RAM
up to 16 MB Fast RAM on motherboard
up to 128 MB Fast RAM on processor cards
up to 1 GB Fast RAM on Zorro III expansion cards
All A3000s have 1 MB Chip RAM
(eight 44256k 120 ns DRAM DIPs) soldered to their motherboard. Eight 20 pin DIP
sockets accept another 1 MB.
Fast RAM can be installed either via DIPs or ZIPs. Eight 20 pin DIP DRAM sockets
accept 4 MB and 32 ZIP sockets accept 16 MB Fast RAM. The ZIP sockets are split
into four banks (bank 0-3), where the first bank is hardwired to the DIP Fast
RAM sockets (bank 0). Thus the two types of Fast RAM cannot be used together in
bank 0. The ZIP DRAM sockets accept either 1M×4 or 256k×4 80 ns ZIPs in
groups of eight (one bank) but all the banks have to have the same sized chips.
The RAM chips can be either static column or page mode ones. Static column ones
support burst memory access and so they perform 10% faster.
Many A3000s shipped with 1 MB 80 ns Fast RAM installed in the DIP sockets, which
were intended to be moved to the empty Chip RAM sockets later on.
Fat Agnus - ECS display
controller
Amber - display enhancer
Super Denise - ECS graphics coprocessor
Paula - audio and I/O controller
Fat Gary - system address decoder
Fat Buster - DMA arbitrary controller
Ramsey - RAM controller
Super DMAC - SCSI DMA controller
Kickstart ROMs
The A3000's ECS chip set and display enhancer offers the following screen modes:
Low | High | Super | |||
---|---|---|---|---|---|
PAL, non-interlaced PAL, scan doubled PAL, interlaced PAL, deinterlaced NTSC, non-interlaced NTSC, scan doubled NTSC, interlaced NTSC, deinterlaced |
320×256 320×256 320×512 320×512 320×200 320×200 320×400 320×400 |
640×256 640×256 640×512 640×512 640×200 640×200 640×400 640×400 |
1280×256 - 1280×512 - 1280×200 - 1280×400 - |
50 Hz, 15.625 kHz 50 Hz, 31.25 kHz 50 Hz, 15.625 kHz 50 Hz, 31.25 kHz 60 Hz, 15.734 kHz 60 Hz, 31.46 kHz 60 Hz, 15.734 kHz 60 Hz, 31.46 kHz |
|
Productivity Super72 |
640×480
- 640×960 400×300 - 800×600 |
50 Hz, 31.5 kHz 72 Hz, 24 kHz |
1× processor card slot
4× Zorro III slots
1× video slot
2× inactive ISA slots
The Zorro, ISA and video slots
are all placed on a daughterboard which is mounted vertically on the
motherboard. All the ISA and video slots are in line with a Zorro III slot.
The Zorro III slots use 32 bit addressing (Zorro II used 24 bit addressing) but
use the same 100 pin slots and are fully backward compatible.
The video slot is similar to the A2000's but has a slightly different bracket.
The two ISA slots have their power and ground pins activated only. In order to
access the slots by the A3000 a BridgeBoard has to be installed. With an
installed BridgeBoard one ISA AT compatible card can be used in the remaining
slot. Inactive slots can be used for non intelligent cards like TBCs or fan
cards.
The A3000 has the same 200 pin processor card slot as the one later utilized in
the A4000. Processor cards designed for the A4000 may not fit properly if they
have a tall heat sink or the SIMM sockets are mounted vertically as the height
is limited in the A3000 by the two 3.5" front drive bays.
2× 3.5" front bays
1× 3.5" rear bay
One of the front bays is
occupied with an A3010 880 kB or an A3015 1.76 MB floppy disk drive. The other
front bay can only be used for an other A301x floppy drive or a hard disk drive,
because the front panel cannot be removed, it is part of the A3000 case.
The A3000 shipped with a SCSI hard disk drive installed into the rear bay.
1× serial DB25 male, RS232
1× parallel DB25 female, Centronics
1× video DB23 male, analog RGB
1× VGA DB15 male, analog RGB
2× mouse/game DB9 male
2× stereo audio RCA jack
1× keyboard 5 pin DIN
1× external floppy DB23 female
1× internal floppy 34 pin header
1× external SCSI DB25
1× internal SCSI 50 pin header
The built in SCSI host adapter -
based around the Western Digital 33C93 SCSI controller - supports up to seven
devices connected simultaneously. The controller's configuration is stored in a
NVRAM powered by the same battery which the clock is.
The floppy drive controller supports up to four devices - two attached to the
internal floppy header and two connected to the external floppy port. Both
double and high density disk drives are supported.
power supply: | 135 W power output 2× standard 4 pin power connectors 2× mini 4 pin floppy drive power connectors |