Amiga 2000-B, but on the inside we consider it different enough to have its own dedicated page here at The Amiga Museum.
24 bit Fast RAM can be ray casino oulu added using Zorro II merit casino avala budva expansion cards up to 8 MB, and 32 bit Fast RAM using processor cards featuring a 68020 or better.
Rev.1 immediately corrected one missing signal on the secondary video slot (no plain Rev.0 boards were released).In it's normal position, the high-order bit is A23; in it's other position, this bit is A19.This was followed up fairly early by the Amiga 2000/HD, which bundled an Amiga 2090 hard drive controller and a scsi-based hard drive.A project to replace it with a 68020 on-board began, intending to be a Zorro-II-based 68020 machine, but the project eventually became the Amiga 3000 when Dave Haynie sought to include his new Zorro-III bus.In 1988, Commodore shipped the Amiga 2500/20, which added the Amiga 2620 CPU card to the CPU slot,.0, a 68881 FPU, and a 68851 MMU to the A2000, along with 2 MB of 32-bit-wide memory.The four ISA slots have their power and ground pins activated only.
The Fast RAM on these models can be reconfigured into Chip RAM by upgrading the Agnus and cutting some connections).
This board appears to be in good physical order, though it hasn't been tested.
Rev.4 I believe made some changes to filtering of the tick feline set bonus with rend line, to account for some new power supplies that had been particularly noisy on that line.
Checkmate Digital: Checkmate A1500 Archived March 14, 2013, at the Wayback Machine "Amiga 2000".Motherboard revisions A2000-A: ( ) It is based on the integration of the A1000 motherboard design and an example Zorro II backplane.Since I was, in essence, copying the German design (they _do_ look similar, eh I took the PAL equations from the Amiga 2000 on the left as my basis for the Buster chip.A black and white composite video connector is provided.At the time, the Rev.x was in production, and the new board was desired for new production, as the price crossover from the 256K x 1 to the 256K x 4 memories had been reached.Later machines came with the ECS chipset and AmigaOS.04.PC ISA slots, two of which are inline with Zorro II slots for use with the A2088 bridgeboard, which adds.
The A2000HD shipped with an A209x scsi controller and a scsi hard disk drive installed.