Welcome, Guest. Please login or register.

Author Topic: TMS 9900  (Read 3987 times)

Description:

0 Members and 1 Guest are viewing this topic.

Offline trekiejTopic starter

TMS 9900
« on: June 04, 2021, 12:17:22 AM »
I was wondering if someone here has any experience with this processor.
This is the cpu in the TI 99 4/a.

It has  a W register to point to where the registers are located in memory.
How does that work and does it provide the switching it says it does?
Amiga 2000 Forever :)
Welcome to the Planar System.
 

Offline A6000

  • Sr. Member
  • ****
  • Join Date: Nov 2007
  • Posts: 443
    • Show only replies by A6000
Re: TMS 9900
« Reply #1 on: June 25, 2021, 10:27:47 PM »
You should get more response to your questions here https://atariage.com/forums/forum/164-ti-994a-computers/
 

Offline psxphill

Re: TMS 9900
« Reply #2 on: June 26, 2021, 04:03:29 PM »
How does that work and does it provide the switching it says it does?

The PC,ST & WS registers are internal to the CPU.

Everything else is really just a load/store into main memory indexed using the workspace (WS) register.