[DB]

I believe you are correct.

My IBM PC-1 (still have it) came with 16kB of DRAM and cassette basic and had chip sockets so you could increase it to 64kB I believe. Then with the addition of other cards and a multipurpose card (I forgot the name of it) you could fill it out to the maximum of 640kB. That multipurpose card also provided a battery backed up real time clock so you didn’t have to type in the time and date every time you booted the machine...

It had dual monitors, a monochrome and CGA/color monitor.

It had dual 5-1/4” 360k double sided floppy drives.

A little later I got a 20 MB hard drive and 8087 coprocessor for it. I wrote an assembly language floating point math library using the 8087 coprocessor that increased the math computational speed by a factor of 7 doing linear circuit analysis... It was really cool...

[The Duke]

You couldn't afford the 'Weitek' math co-processor? Now that was da-bomb! As I recall it occupied a very large address space because it pre-calculated the results of all operation on all combinations of its 16 registers, so if you loaded a number in register 1 and another number in register 2, you could fetch (reg 1 + reg 2) from one memory location, (reg1 * reg2) from another, and so on ...

Back in those days I was displaying simulations of WWIII on Megatek graphics workstations.