People here seem to forget the Amiga 1000 was developed in 1984-85, do you have a clue how f----en expensive ram was then?
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RAM was initially quite expensive, but the price in fast decline. This is why the first came with so little RAM (e.g. 512 K maybe even 256 K) and very soon a RAM upgrade was very common, when it got affordable ( e.g. $1 per kbyte). When the A500 came out one was really thinking why they could not put 1 M inside from the beginning as essentially everybody did the upgrade.
It was a difficult, challenging time to design a new computer, as quite a lot was changing at that time: Monitor horizontal, going monochrome to color, the mouse got common, memory prices in fast decline, going from mask ROM to EPROM, EEPROM came up, Hard discs came up - though expensive, RAM speed got critical, RAM started to need parity check, start to go beyond 8 Bit CPUs. So it was easy to get it wrong at one aspect or the other:
The first Macintosh missed out color and had little memory (but supposedly upgradable)
The IBM PC essentially required the HD to be useful and was quite expensive. MSDOS from floppy was
. Later came the 640 K limit.
The Amiga missed out on faster monitors / flickering.
The C128 was still very limited in memory, too small a step up.
The early PC's has that 640 K memory limit
The Atari ST, was not very expandable and a little split in BW / color mode.