Edstrom VME bus project - JoakimLarsson/mame GitHub Wiki

Table of Contents Specifications VME interface Force boards Force CPU-1 Todo

• Motorola Versabus specification, July 1981
• Motorola VMEbus specification, Oct 1981
• VITA VMEbus specification Rev C.1, Oct 1985

The approach is to start high and go into details depending on board driver ROM requirements. The first board to get a VME interface is the Mizar 8105 board. It accesses a SIO on another VME board and it works without interrupts. According to the specifications this simple functionality requires implementation of the following modules as **first step**:

• MASTER
• SLAVE

Second step would be to add interrupts:

• INTERRUPTER
• INTERRUPT HANDLER

Third step would be to prepare for multi master

• CONTROLLER
  • Data Transfer Bus ARBITER
  • Emergency Data Transfer Bus REQUESTER
  • Power up/power down MASTER
  • System clock driver
  • System reset driver
  • System test controller
  • Power monitor (for AC clock and AC fail driver)

• Add LED:s
• Add jumpers
• Add VME bus interface
• Boot 68K software from storage over VME bus