This page was last modified 10:29, 15 January 2022 by Gdx.

MSXs have generally a Z80A when it is not integrated in a chipset. A is the CPU class for a frequency up to 4Mhz.

The MSX specification specifies a Z80A running at 3.58MHz. (More exactly 315/88 million Hz). The Z80 was originally designed by Zilog but most MSX have a Z80 from another manufacturer.

A few variations exist:

  • Panasonic MSX2+ computers which can be switched programmatically to a higher CPU speed (5.36MHz)
  • Panasonic Turbo R computers which also have a R800 CPU in addition to the Z80A
  • Victor HC-90 and HC-95 computers which have a Z180 CPU in addition to the Z80A

Also, some systems feature a "speed controller" slider which allows the CPU to be slowed down (for use in games). This doesn't affect the CPU clock though. It's implemented as an autofire that actuates on the PAUSE button, synced with BLANK.

See this page for info about programming.

List of compatible Z80 found in the MSXs

List of other compatible Z80

Pages in category "Z80"

The following 8 pages are in this category, out of 8 total.