Prams mail/telephone protocol

A blast from the past!

PRAM (Programmed Read-Only Memory) is an old type of computer memory that was used in the early days of computing. It's not commonly used today, but I'll provide some information on the protocol used to access PRAM.

PRAM Mail Protocol

PRAM was used to store data in a non-volatile memory chip. The PRAM mail protocol was a simple protocol used to read and write data to PRAM chips. Here's a brief overview:

  1. Addressing: The PRAM chip had a 16-bit address bus, which allowed it to address up to 64 KB of memory.
  2. Data transfer: Data was transferred between the CPU and PRAM chip using an 8-bit data bus.
  3. Read operation: To read data from PRAM, the CPU would send the address of the desired location on the address bus. The PRAM chip would then send the data back to the CPU on the data bus.
  4. Write operation: To write data to PRAM, the CPU would send the address of the desired location on the address bus and the data to be written on the data bus. The PRAM chip would then store the data at the specified address.

PRAM Telephone Protocol

The PRAM telephone protocol was a protocol used to communicate with PRAM chips over a serial interface, such as a telephone line. This protocol was used to access PRAM chips in devices that didn't have a direct connection to the CPU, such as in telephones or other embedded systems.

The PRAM telephone protocol used a simple asynchronous protocol to transmit data between the CPU and PRAM chip. Here's a brief overview:

  1. Handshaking: The CPU would send a "ready" signal to the PRAM chip to indicate that it was ready to receive data.
  2. Address transmission: The CPU would send the address of the desired location on the PRAM chip to the PRAM chip.
  3. Data transmission: The CPU would send the data to be written or read from the PRAM chip.
  4. Acknowledgment: The PRAM chip would send an acknowledgment signal back to the CPU to indicate that the data had been received and processed.

The PRAM telephone protocol was a simple and reliable protocol that was used in many early computer systems. However, it has largely been replaced by more modern protocols and technologies.