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AuthorTopic: TMS 9900  (Read 1788 times)

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Offline trekiej

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?
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Offline 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.