Standard Specifications

Case Type:	Desktop
Processor:	EC030@25Mhz (on motherboard for A4000-CR models) EC030@25Mhz via a Commodore A3630 040@25Mhz via Commodore A3640
MMU:	None (030 versions) Internal (040 version)
FPU:	Optional, but not standard (030 versions) Internal (040 version)
Chipset:	AGA
Kickstarts:	V3.0 (2 ROMs)
Bus Controller:	Buster Rev 7 (Prototype A4000 only) Super Buster Rev 9 Super Buster Rev 11
Expansion Slots:	4 x 100pin Zorro III slots 1 x AGA Video slot (inline with Zorro) 3 x inactive 16bit ISA slots (inline with Zorro) 1 x 200pin CPU Fast slot.
Standard CHIP RAM:	2MB
RAM sockets:	4 x 72pin SIMM slots (A4000-CR only, 2MB Chip is surface mounted) 5 x 72pin SIMM slots (one slot is reserved for Chip RAM)
Hard Drive Controllers:	1 x 3.5" Buffered IDE Controller
Drive Bays:	1 x 5.25" (with faceplate, None for Black A4000) 4 x 3.5" (2 with faceplates) Note: Some machines were supplied with 1.5 times height floppy drives, in this case the second externally accessible 3.5" bay is fairly useless as it's only half height.
Expansion Ports:	1 x 25pin Serial 1 x 25pin Parallel 1 x 23pin RGB Video 1 x 23pin External Floppy 2 x 9pin Joystick/Mouse 2 x RCA Audio (Left/Right) 1 x PS/2 style Keyboard Connector
Floppy Drive:	1 x Internal 1.76MB Floppy Drive Note: Some machines were shipped with single height drives, others had 1.5 times height drives.
Motherboard Revisions:	Rev 1 (Early prototype, with black case) Rev B (Most Common) Rev C (Rare) Rev D (A4000-CR)
Battery Backed Up Clock:	Yes, uses "Barrel" shaped batteries, except Rev D which uses "Coin" shaped batteries.

The A4000 is often seen as the big brother of the A1200 but was targetted more at productivity users, rather than gamers. The A4000 was seen as a disappointment to many after the reception that the A3000 received. Although it uses a newer ROM and Chipset, the onboard SCSI-II had been replaced with a significantly slower IDE Controller (PIO Mode 0) and it did not contain the scandoubling hardware for attaching PC VGA type monitors which the A3000 did. Significant improvements were however, made to the Zorro III bus design particularly with regards to DMA and bus mastering that fixed many problems which plagued the A3000, providing you had a Rev 11 buster. Unlike most other big box Amigas the A4000 uses a PS/2 style keyboard connector, however the signals and keyboard clock that the A4000 uses are not the same as the PC so you cannot use PC PS/2 keyboards. Like most big box Amigas the A4000 also has a keylock which effectively works by removing power from the keyboard and mouse rendering the machine fairly useless.

Some A4000's may have been released which contained 020 CPU's, as the A3630 that was supplied with the A4000 can also be fitted with an 020 and there is one claim that Commodore donated an 020 based A4000 as a prize at The Gathering '92. A4000's with a Rev D motherboard differ slightly from the other versions and are dubbed "A4000-CR" which stands for "Cost Reduced". It was an attempt to reduce the cost of manufacturing the A4000. Most A4000's were shipped with a separate processor card connected to the CPU fast slot however the A4000-CR had an 030 soldered directly to the motherboard therefore a processor card was not required. It still contained the CPU fast slot however for attaching accelerators. In addition to this Commodore also removed the fifth SIMM slot which is reserved for CHIP ram and soldered the CHIP directly to the motherboard. As all A4000s were supplied with 2MB CHIP by default, the fifth SIMM slot was rather useless because the AGA chipset could not address more than 2MB of CHIP. Commodore had planned to give the A4000 the ability to address up to 8MB of CHIP and indeed a jumper can be found on the motherboard which would have been used for this purpose, but the jumper actually does nothing.

Jumpers

Function	Jumper	Setting	Description
CLK 90 Clock Source	J100	1-2	Internal (020/030)
		2-3	External (040)
CPU Clock Source	J104	1-2	Internal
		2-3	External
ROM Speed	J151	1-2	200ns
		2-3	160ns
CHIP RAM Size	J213	1-2	2MB
		2-3	8MB (Non Functional and never will be!)
Second Internal Floppy	J351	ON	No second internal floppy or second internal floppy is 1.76MB
		OFF	Enabled second 880K floppy as DF1:
Redirect DF0:	J352	1-2	Internal DF1: and DF0:, External DF2: and DF3:
		2-3	Internal DF1: and DF2:, External DF0: and DF3:
Enable DSACK	J850	OFF	Required if CPU is 020. Also requires U860 and U152
		ON	No DSACK
RAM SIMM Size	J852	1-2	2MB or 4MB SIMMs
		2-3	1MB SIMMs
Video Type	J212	1-2	NTSC
		2-3	PAL
VBB/MA10	J214	1-2	Supplied VBB to Alice
		2-3	Alices supplies MA10 for 8MB CHIP (Non Functional and never will be!)
Video Sync	J500	1-2	Sync on Green Disabled
		2-3	Sync on Green Enabled
LISA Sync	J501	1-2	RESERVED
		2-3	DEFAULT
DAC Sync	J502	1-2	DAC sync on green
		2-3	DAC uses standard signal

 

Amiga A4000T

Standard Specifications

NOTE: These specifcations apply to the A4000T made by Commodore, and do not necessarily apply to the A4000T made by Amiga Technologies.

Case Type:	Full Tower
Processor:	040@25Mhz (via Commodore A3640)
MMU:	Internal
FPU:	Internal
Chipset:	AGA
Kickstarts:	V3.1 (Two ROM chips)
Bus Controller:	Super Buster Rev 11
Expansion Slots:	5 x 100pin Zorro III slots 2 x AGA Video Slots (both inline with Zorro slots) 4 x Inactive 16bit ISA slots (3 inline with Zorro slots) 1 x 200pin CPU Fast Slot
Standard CHIP RAM:	2MB (Surface Mounted)
RAM sockets:	4 x 72pin SIMM slots
Hard Drive Controllers:	1 x 3.5" IDE Controller 1 x SCSI-II Controller
Drive Bays:	5 x 5.25" (3 Horiztonal, 2 Vertical, all with faceplates)
Expansion Ports:	1 x 25pin Serial 1 x 25pin Parallel 1 x 23pin RGB Video 2 x 9pin Joystick/Mouse 2 x RCA Audio (Left/Right) 1 x 3.5mm Headphone 1 x 50pin External SCSI 1 x RCA Composite 1 x 5pin DIN Keyboard
Floppy Drive:	1 x Internal 1.76MB Floppy Drive.
Motherboard Revisions:	Rev 4
Battery Backed Up Clock:	Yes (Coin shaped lithium battery). Two terminals are also available for attaching an external battery

The A4000T from Commodore only saw a limited production of machines (estimated at 200) before they went bust in 1994. North American units were manufactured in West Chester, Pensylvania whilst European units were assembled in Bensheim, Germany. The A4000T is arguably the best Amiga model ever made. It is easy to assume that the A4000T is simply the same motherboard as the desktop A4000, but this is not the case. The A4000T uses a totally separate motherboard. The A4000T is intended to be a large AT form factor motherboard and infact appears to use a standard PC AT power supply. Unlike the desktop version, the A4000T also includes a SCSI-II controller on the motherboard in addition to a 3.5" IDE controller. This is why the A4000T uses a slightly different version of Kickstart 3.1 compared to other Amigas (including the A4000). It contains the drivers for the SCSI-II controller in ROM and in order to allow it to fit, workbench.library was moved from ROM, supplied on the Workbench disks and is loaded from LIBS: like any other disk based library. The A4000T also contains an internal speaker for native sound output, however external speakers and headphones can also be used. The speaker can be disabled or enabled by pressing the button labelled "Turbo". The case also contains a reset button as well as a key lock. The A4000T also uses coin shaped lithium batteries unlike most Amiga models which use the barrel shaped batteries. The A4000T contains 4 x 72pin SIMM slots for adding up to 16MB of RAM in addition to the 2MB of Chip RAM surface mounted on the motherboard. SIMM sizes of 1MB, 2MB, 4MB and 8MB can be used. Please note, than even though it is possible to use 8MB SIMMs, you are still limited to 16MB on the motherboard. If 8MB SIMMs are used, only 2 SIMMs can be used and they must be inserted in alternate slots. All of the external connectors in the A4000T reside on little cards which in turn connect to the motherboard. This means they could easily be replaced or upgraded and infact some companies did release alternate cards for the small PCB containing the video related ports. The A4000T uses the 5pin DIN keyboard connector, unlike the PS/2 style connector which the A4000 uses. Unusual for Amigas, the A4000T does NOT have an external floppy drive connector, however two internal drives can be used.

Jumpers

Jumper	Setting	Function
J100	Pins 1 and 2	CLK90 Clock Source is Internal
	Pins 2 and 3	CLK90 Clock Source is External
J104	Pins 1 and 2	CPU Clock Source is Internal
	Pins 2 and 3	CPU Clock Source is External
J151	Pins 1 and 2	ROM Speed is 200ns
	Pins 2 and 3	ROM Speed is 160ns
J300	Pins 1 and 2	SIMMs are 4MB or 8MB
	Pins 2 and 3	SIMMs are 1MB or 2MB
J212	Pins 1 and 2	Select NTSC
	Pins 2 and 3	Select PAL
J500	Pins 1 and 2	Sync on green
	Pins 2 and 3	Sync on green disabled

Disk Module Jumpers

Note: The small PCB where the serial port, parallel and video port are connected also contains a 50pin connector. This is actually a terminator for plugging the end of the SCSI cable into

Jumper	Setting	Function
J250	OFF	No second internal floppy or second floppy (DF1:) is High Density 1.76MB
	ON	Second internal floppy (DF1:) is Double Density (880K)

Copyright Notice:
Parts of this page are (C) Ryan E. A. Czerwinski and are used with permission for inclusion in "The Big Book of Amiga Hardware.

 

 

Amiga A3400

The A3400 is an early project name for what eventually became the Commodore A4000. No A4000s were ever released to the public with the A3400 designation however they were sent to developers such as Famo and Scala for evaluation. The unit was also supplied with a Commodore A3630 or A3640 but some versions appear to be able to take an 030 directly onto the motherboard. The unit was also supplied with a standard FB-357a floppy drive an A4000 style 240V PSU. There may have be North American versions supplied with a different voltage PSU.

- The motherboard is labelled "Commodore A4000, Rev 1"
- The daughterboard is labelled "A2400/A3400 DAUGHTER BOARD REV. 0.0"
- The A3630 is labelled "A3200/A3400 68020/030 BOARD Rev 1.0 "
- The A3640 is labelled "A3640 BOARD Rev.3.0"
- On some versions of the motherboard the ALICE and LISA chips are labelled "WAFER#6" and "WAF-06"
- On some versions of the motherboard the chips have hand-written labels.