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4K or 8K bytes RAM, expandable to 65K.
"...a MOS Technology 6502 microprocessor running at 1 MHz, two game paddles,[9] 4 kB of RAM, an audio cassette interface for loading programs and storing data, and the Integer BASIC programming language built into the ROMs. The video controller displayed 24 lines by 40 columns of monochrome, upper-case-only (the original character set matches ASCII characters 20h to 5Fh) text on the screen, with NTSC composite video output suitable for display on a TV monitor, or on a regular TV set by way of a separate RF modulator. The original retail price of the computer was $1,298 USD[10] (with 4 kB of RAM) and $2,638 USD (with the maximum 48 kB of RAM).[11]"
" The Apple II Plus, introduced in June 1979,[20][21][22][23] included the Applesoft BASIC programming language in ROM. This Microsoft-authored dialect of BASIC, which was previously available as an upgrade, supported floating-point arithmetic, and became the standard BASIC dialect on the Apple II series (though it ran at a noticeably slower speed than Steve Wozniak's Integer BASIC).
Except for improved graphics and disk-booting support in the ROM, and the removal of the 2k 6502 assembler/disassembler to make room for the floating point BASIC, the II+ was otherwise identical to the original II. RAM prices fell during 1980–81 and all II+ machines came from the factory with a full 48k of memory already installed. The language card in Slot 0 added another 16k, but it had to be bank switched since the remaining CPU address space was occupied by the ROMs and I/O area. For this reason, the extra RAM in the language card was bank-switched over the machine's built-in ROM, allowing code loaded into the additional memory to be used as if it actually were ROM. Users could thus load Integer BASIC into the language card from disk and switch between the Integer and Applesoft dialects of BASIC with DOS 3.3's INT and FP commands just as if they had the BASIC ROM expansion card. The language card was also required to use the UCSD Pascal and FORTRAN 77 compilers, which were released by Apple at about the same time. These ran under the UCSD p-System operating system, which had its own disk format and emitted code for a "virtual machine" rather than the actual 6502 processor. "
old Apple ][ 5.25inch floppy disks were apparently 140k per side.
Later there were mac 3.5 inch hard "floppy" disks that were apparently 400k, 800k (double-sided media) or 1.44 MB (double-sided, high-density)
" The Apple II Plus was followed in 1983 by the Apple IIe, a cost-reduced yet more powerful machine that used newer chips to reduce the component count and add new features, such as the display of upper and lowercase letters and a standard 64 kB of RAM.
The IIe RAM was configured as if it were a 48 kB Apple II Plus with a language card; the machine had no slot 0, but instead had an auxiliary slot that for most practical purposes took the place of slot 3, the most commonly used slot for 80-column cards in the II Plus. "
The NES, the Nintendo Entertainment System, a variant of the Famicom, is an old 8-bit video game console (that my family had when i was a kid).
It had a 6502-based (Ricoh 2A03) CPU (16-bit addressing), 2 KiB? built-in RAM ("PRG RAM" (program RAM) or "WRAM" (working RAM)), a GPU (PPU, "Picture Processing Unit"), 2 KiB?