Standard Specifications
| Case Type: |
Full Tower |
| Processor: |
040@25Mhz (via Commodore A3640) |
| MMU: |
Internal |
| FPU: |
Internal |
| Chipset: |
ECS (Plus the additional chips Amber, SuperDMAC-04 and Ramsey-07) |
| Kickstarts: |
V2.04 |
| Bus Controller: |
Super Buster Rev 7
Super Buster Rev 9
Super Buster Rev 11 (later builds, field upgrades) |
| Expansion Slots: |
5 x 100pin Zorro III slots
1 x ECS Video Slot (inline with Zorro)
4 x inactive 16bit ISA slots (2 inline with Zorro)
1 x 200pin CPU Fast Slot. |
| Standard CHIP RAM: |
1MB (but supports 2MB) |
| RAM sockets: |
ZIP Sockets for Chip RAM
ZIP sockets for Fast RAM. |
| Hard Drive Controllers: |
1 x SCSI-II Controller |
| Drive Bays: |
At least:
2 x 3.5" (2 with floppy faceplates)
3 x 5.25" (3 with faceplates, 2 vertical, 1 horizontal) |
| Expansion Ports: |
1 x 25pin Serial
1 x 25pin Parallel
1 x 23pin RGB Video
1 x 15pin VGA Connector
1 x 23pin External Floppy
2 x 9pin Joystick/Mouse
2 x RCA Audio (Left/Right)
1 x 25pin External SCSI connector
1 x large 5pin DIN Keyboard connector |
| Floppy Drive: |
1 x Internal 880K Floppy Drive (for 030 version)
1 x Internal 1.76MB Drive (for 040 version) |
| Motherboard Revisions: |
(Earlier revisions are likely to be A3500 motherboards)
Rev 6.1 |
| Battery Backed Up Clock: |
Yes, uses "Barrel" shaped battery. |
The A3000T-040 is a rare version of the normal A3000T. In the 040 version, the 68030 processor and 68882 floating point math co-pocessor may have been omitted from the motherboard build (left blank) in some later builds. The A3640 (Version 3.0) was screwed on with metal screws on the cpu slot. The shown machine was factory-delivered with a 320 Mb harddrive. The low serial number of the featured machine suggests that very few A3000T-040 was produced.
It's said that the front cover was whiter than the normal A3000T to match the then new A4000. These machines was supposedly produced to satisfy Video Toaster Users, as they were super expensive and the A4000 was already out.
It is easy to assume that the A3000T is the same as the A3000 but shipped in a full tower instead of a desktop case, however the A3000T is infact a totally separate motherboard. The A3000T is a huge machine and probably has the largest motherboard of any Amiga, including the A4000T. It is similar to the A3000 but offers far more expandability. The Zorro and ISA slots are fitted directly onto the motherboard rather than being on a daughterboard (riser card) as they are in the desktop A3000. Like the A3000D, the A3000T has a small amount of NVRAM bits designed to hold the settings for the SCSI controller which is the same WD33C93A model as in the desktop model. The A3000T also has a keylock and has an internal speaker for playing native audio, however external speakers can still be used. The A3000T contains a builtin scandoubler which allows PC type SVGA monitors to display the native NTSC and PAL Amiga screenmodes, which can be disabled with a switch on the rear.
Aside from early builds (i.e. - likely A3500-markings on the motherboard) which may have shipped with the A3000D's typical SDMAC-02 and RAMSEY-04 pairing, most A3000T units shipped with the Dave Haynie-revised SDMAC-04 and RAMSEY-07 pair, which better dealt with the longer signal lines present on the larger A3000T motherboard, some marginal timing that could come off of Super Gary and the Expansion bus, and possibl heavier loads that some other accelerators could place on some motherboard signals.
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Amiga 3000/3000T Jumper Settings Table From The A3000D/A3000T Schematics
- Mobo Schematics -\/313311\/-----------------------------------------------
Jumper Pins -01 -02 -03 -04 Function
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J100 4 2-3 2-3 1-2 1-2 Quadrature Clock Phasing
J101 3 2-3 2-3 2-3 2-3 FPU Clock Source - Default 2-3
J102 3 2-3 2-3 2-3 2-3 System Clock Source - Default 2-3
J103 4 3-4 3-4 3-4 3-4 FPU CS/BERR - Default 3-4
J104 3 1-2 1-2 1-2 1-2 CPU Clock Source - Default 1-2
J151 3 2-3 2-3 1-2 1-2 ROM Timing
J152 3 2-3 2-3 1-2 1-2 ROM Timing
J180 3 2-3 2-3 2-3 2-3 A2000 ROM Compatibility Jumpers
J181 3 2-3 2-3 2-3 2-3 A2000 ROM Compatibility Jumpers
J200 3 1-2 2-3 1-2 2-3 NTSC/PAL Select
J350 3 1-2 1-2 1-2 1-2 Tick Clock Source
J351 3 2-3 2-3 2-3 2-3 Disable DF1: (1-2 to enable)
J352 3 2-3 2-3 2-3 2-3 Light Pen Source
J481 3 2-3 2-3 2-3 2-3 VDE Scan Double Only Jumper
J482 3 1-2 1-2 1-2 1-2 VDE PLL Loop Adjust
J483 3 - - - - VDE Factory Test Points
J800 3 1-2 1-2 1-2 1-2 WD33C93
J851 3 1-2 1-2 2-3 2-3 RAM Controller Speed Jumper
J852 5 4-5 4-5 4-5 4-5 -012A Ramsey only (See Notes)
J853 3 2-3 2-3 2-3 2-3 -012A Ramsey only (See Notes)
J852 connecting pins 2 & 3 : 1Mbit, in 256k x 4
J852 connecting pins 1 & 2 : 4Mbit, in 1m x 4
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Jumper Details & Defaults:
Quadrature Clock Phasing
J100 1-2 - (native) 68030, and most INT clocked accelerators.
J100 3-4 - setting for many EXT clocked accelerators.
- J102 usually changes if this jumper changes for an accelerator card.
FPU Clock Source.
J101 2-3 - Default for all uses.
System Clock Source
J102 1-2 - EXT for EXT clocked accelerators (comes from the accelerator).
J102 2-3 - INT for 68030 (default), and most INT clocked accelerators.
- J100 usually changes if this jumper changes for an accelerator card.
J103 3-4 - FPU Chip select jumper - three possible positions.
- 1-2 - disables the onboard FPU (if removed).
- 2-3 - causes the 68030 to get F-line traps instead of the FPU transaction.
- 3-4 - enables the onboard FPU (default).
Leave this setting alone for most accelerators.
J104 - CPU Clock Source
- 1-2 - Motherboard Clock.
- 2-3 - TBD
A3000T Rev 6.1 (Motherboard 313193):
J105, J106, J106 - Open - Use TBD.
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Jumper Details - ROM-related
The ROM timing circuit provides four different speed settings to match the output enable and access timing of the system ROMs.
To set the jumpers, determine the output enable time and access times for the ROMs you wish to use. The ROM must have lower values than for the setting you select.
J151, J152 ROM Timing: (ns/min)
16MHz J151-2/3, J150-2/3 = Toe 157, Tacc 250
16MHz J151-2/3, J150-1/2 = Toe 220, Tacc 312
16MHz J151-1/2, J150-2/3 = Toe 282, Tacc 375
16MHz J151-1/2, J150-1/2 = Toe 345, Tacc 437
25MHz J151-2/3, J150-2/3 = Toe 90, Tacc 160
25MHz J151-2/3, J150-1/2 = Toe 130, Tacc 200
25MHz J151-1/2, J150-2/3 = Toe 170, Tacc 240
25MHz J151-1/2, J150-1/2 = Toe 210, Tacc 280
From C=: System standard ROMs have T(oe) = 110ns and T(acc) = 250ns.
ROM/EPROM Type (16bit/32bit)
J180/J181 - A2000/A500 (single 27C400)
J180/J181 - A3000 (double 27C400)
If the A3000D motherboard is an earlier revision model, and comes with a ROM tower PCB, you must continue to use it. The older motherboard ROM sockets are not compatible with the 27C400 part.
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Jumper Details - System Option Defaults
J200 - NTSC/PAL Select
NTSC - 1/2
PAL - 2/3
U350 - Tick Clock Source
Default 1/2
J351 - Internal DF1 Detect Circuit:
Disable - 2/3
Enable - 1/2
J352 - Light Pen Source
Default 2/3 - A500-style.
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Jumper Details - Factory Options
J481 VDE Scan Double Only Jumper
Default 2/3
J482 VDE PLL Loop Adjust
Default 1/2
J483 VDE Factory Test Points
Open
J800 - 1/2 - 33C93A Clock (14.xxx MHz), 2/3 unsupported by software.
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Jumper Details - RAMSEY Memory Controller
J851-J853 Ramsey RAM Controller Compatibility Settings:
J851 System Memory Speed
- 1/2 = 16MHz
- 2/3 = 25MHz
J852/J853 - System Memory Component Size
Early -012A Ramsey w/256x4 DRAM J852-4/5, J853 2/3 (only early A3000D machines)
Ramsey -02/04/07 (*)
- w/256x4 DRAM J852-2/3, J853 2/3
- w/1Mx4 DRAM J852-1/2, J853 1/2
(*) Most systems only need to consider adjusting J852 for 256x4 vs 1Mx4 chips.
Rev 6.1 A3000T motherboard has silkscreen reference for J851 (System MHz) and J852 (Memory Part Size), and J853 is absent.
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NVRAM Settings
The A3000 has an NVRAM configuration which is powered by the onboard battery. The NVRAM bits support the following:
SCSI Controller ID: This places the onboard SCSI controller at a specific ID location, 7 by default. The driver does not specifically support changing this value.
Long SCSI Timeout: This extends the boot scan period to allow slow (to become ready) devices to become ready before boot is atempted.
Synchronous SCSI: This enables Synchronous SCSI mode, which can speed access on some devices. This is fully operational on Kickstart 3.1 and above. Stable SCSI termination is mandatory (both ends of the SCSI bus), as is good cabling.
Multiple LUNs Mode: This enables scanning for multiple drives at each SCSI ID address. Unless you have a device that supports multiple LUNs, this should remain disabled.
These options can be adjusted with varous tools on AmiNet. Several examples include:
- SCSI-Prefs - disk/misc/SCSI-Prefs.lha
- SCSIPrefs - driver/media/SCSIPrefs.lha
- SetBatt-1.2 - util/wb/SetBatt-1.2.lha
- SetBatt1_0 - util/sys/SetBatt1_0.lha
Most of these options should be a set once and forget thing as long as there's a battery powering the clock/NVRAM. If no battery is available, it may be necessary to set these values during system startup, and warm reboot once to have them take effect on subsuquent warm reboots.