ScuzzBlog: Diaries October 2023

Entry 9th October 2023: Post 1: Amiga 1500 - Lost images.

Amiga 1500 - Lost images.

A bit late I know but a while back I featured this Amiga 1500 in
a blog about backing up the hard disk drive to the emulator. The
process was a slow painful session involving using floppy disks.
I was successful in making the transfer from Amiga to emulator
and now have a working copy safely archived and available to use
and reference.

The original drive was not mine just to clarify that I am not James.

The computer is a permanent feature and used quite regularly. At
the time I did not want to struggle with the computer to place on
the bench and photograph. I cursed at the time cus search as I might
I could not find a set of pictures I knew I had of the machine. As
is the case so often, whilst searching old blogs I found the pics.
They were lost amongst a whole bag of stuff for 12th February 2016.
Today I revive those images so that I can best use them in the
future. The only thing that changed is the monitor.

Model Range:


Released in 1987 as Commodore's first high end expandable
machine. Though early models were based around the A1000
design, the later models were built around the A500 chipset.

The hard drive version named the A2000HDcame with an A209x
SCSI controller and a SCSI hard disk drive. The A2500 version
has a processor card added to the A2000HD configuration. The
A1500 was aimed primarily at the UK market and was fitted with
two floppy drives but no hard disk drive. The A2500UX came with
AT&T Unix System V Release 4 operating system instead of AmigaOS,
and had a three button mouse, and often with a tape streamer
and Ethernet card.

68000 @ 7-28 MHz
68020 @ 7-25 MHz
68030 @ 16-50 MHz
68040 @ 25-40 MHz
68060 @ 50 MHz

The A1500 and A2000 have a socketed 68000 @ 7.14 MHz
processor on the motherboard and were fitted with an empty
processor slot.

The A2500 uses a processor card. The A2500/020 came with
an A2620 processor card featuring a 68020 and 68881 @ 14 MHz,
and the A2500/030 came with an A2630 featuring a 68030 and
68882 @ 25 MHz.

up to 2 MB Chip RAM
up to 128 MB Fast RAM on processor cards
up to 8 MB Fast RAM on Zorro II expansion cards

the majority of A2000's have 1 MB RAM soldered to their
motherboard. Early models, the 3.x series, have 512 kB
Chip RAM on their motherboard and 512 kB Fast RAM on the
processor card. The 4.x series have both 512 kB Chip and
Fast RAM soldered to the motherboard, whilst the 6.x series
have the RAM set up as 1 MB Chip RAM. Chip RAM can be expanded
to 2 MB with third party expansions which replace the Agnus
chip. 24 bit Fast RAM can be added using Zorro II expansion
cards up to 8 MB, and 32 bit Fast RAM using processor cards
featuring a 68020 or better.

Custom chips
Agnus / Fat Agnus - OCS / ECS display controller
Denise / Super Denise - OCS / ECS display encoder
Paula - audio and I/O controller
Gary - system address decoder
Buster - DMA arbitrary controller

The A2000 OCS or ECS chip set offers the same screen modes as
the A500 and A500 Plus:

Amiga 1500 - Lost images.

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Last updated 9th October 2023

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