Wiki editing discussion

I do not understand when you say: "pages describe a logical address, and banks/slots/segments a physical address". Physical addresses are the ones the CPU can see directly, is not it?

In computing, a logical address is the address at which an item (memory cell, storage element, network host) appears to reside from the perspective of an executing application program.

A logical address may be different from the physical address due to the operation of an address translator or mapping function. Such mapping functions may be, in the case of a computer memory architecture, a memory management unit (MMU) between the CPU and the memory bus.

A page, memory page, or virtual page is a fixed-length contiguous block of virtual memory, described by a single entry in the page table. It is the smallest unit of data for memory management in a virtual memory operating system. Similarly, a page frame is the smallest fixed-length contiguous block of physical memory into which memory pages are mapped by the operating system.

Wikipédia says "A memory bank is a logical unit" as I use in wiki (because I say that the RAM is divided in 4 banks in which we can switch the pages of the slots or the segments of the Mapper).

When a transient program is loaded, the mapper RAM slot will be enabled in all four pages and the four RAM segments which make up the basic 64k will be paged in. [...] Pages 0, 1 and 2 can contain any slot when doing a function call and will be preserved. [...] Any RAM segments can be selected in pages 0, 1 and 2

By switching slots, it is good to be able to handle memory exceeding 64 kilobytes, but at that time it is inconvenient to switch the entire memory at the same time. Therefore, in MSX, it is thought that the memory is divided into "pages" and handled. 16 kilobytes from 0000H to 3FFFH of memory to page 0, page 16 from 4000H to 8000H page 1 page 1. Similarly, from 8000H to BFFFH, page 2, C000H to FFFFH to page 3, and so on. For each page with 16 kilobytes as one block, you can select every slot. For example, when BASIC's disk I / O-related instructions are being processed, page 0 is switched to the main ROM of the BASIC interpreter, page 1 to the disk interface ROM, and pages 2 and 3 to main RAM (see Figure 2.3)

Allocate slot 0 for page 1

I do not think it's relevant to talk about virtual memory. This is to manage a mix of different types of storage. There is only talk of RAM and ROM interconnected by a switching system.

In a computer supporting virtual memory, the term physical address is used mostly to differentiate from a virtual address. In particular, in computers utilizing a memory management unit (MMU) to translate memory addresses, the virtual and physical addresses refer to an address before and after translation performed by the MMU, respectively.

An iconic example of virtual-to-physical address translation is virtual memory, where different pages of virtual address space map either to page file or to main memory physical address space. It is possible that several numerically different virtual addresses all refer to one physical address and hence to the same physical byte of RAM. It is also possible that a single virtual address maps to zero, one, or more than one physical address.

The guy who chose this term should have done another job.

About "bank", the term "page" can only bring confusion. "Bank" does not seem to fit some people. We can replace it with "area" if you prefer although I find this term a bit too general.