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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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 Posted: Sat Mar 11, 2006 6:54 pm Post subject: Old toshiba CPU |
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4-Bit, custom instruction set 800Khz MCU Made in the id-70's
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debs3759
Joined: 18 Jan 2006
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Location: In the computer room
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| Posted: Sat Mar 11, 2006 7:01 pm Post subject: |
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Nice 
One question that brings to mind - how do you find out what a custom chip of that age is? I mean, that's a pretty specific description for a 30 year old custom chip...
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gshv
Joined: 01 Feb 2003
Posts: 7038
Location: Fairfax, VA USA
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| Posted: Sat Mar 11, 2006 7:26 pm Post subject: |
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| debs3759 wrote: | | One question that brings to mind - how do you find out what a custom chip of that age is? I mean, that's a pretty specific description for a 30 year old custom chip... |
It's not a custom chip, it only has custom instruction set.
Gennadiy |
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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| Posted: Sat Mar 11, 2006 7:33 pm Post subject: |
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and I have a book which has a brief datasheet on it.
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debs3759
Joined: 18 Jan 2006
Posts: 5132
Location: In the computer room
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| Posted: Sat Mar 11, 2006 7:49 pm Post subject: |
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| gshv wrote: | | debs3759 wrote: | | One question that brings to mind - how do you find out what a custom chip of that age is? I mean, that's a pretty specific description for a 30 year old custom chip... |
It's not a custom chip, it only has custom instruction set.
Gennadiy |
That's something new to me then Does that mean that it's a standard chip which used something like microcode to set up the instruction set?
| CPUShack wrote: | | and I have a book which has a brief datasheet on it. |
That explains it then Just goes to show what a dedicated collector can accumulate
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Elar
Joined: 16 Jul 2003
Posts: 641
Location: Tallinn, Estonia
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| Posted: Sun Mar 12, 2006 4:11 am Post subject: |
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Is this a general purpose CPU? There is other variants of this chip T3444A, T3444BS, T3444D:
http://www.st.rim.or.jp/~nkomatsu/diskif/T3444A.html
T3444A is floppy disk controller, T3444B seems to be magnetic tape controller if I understand babelfish translation correctly. |
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gshv
Joined: 01 Feb 2003
Posts: 7038
Location: Fairfax, VA USA
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| Posted: Sun Mar 12, 2006 10:59 am Post subject: |
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I have the same book as John has, and it doesn't give much details about the chip. It does mention two pre-programmed versions of the microcontroller: T3444A floppy-disk controller and T3444B digital cassette controller (babelfish was correct). The chip has 256 x 24bits ROM, I guess this memory is used to store both the instruction set and program.
BTW, the book is "Microprocessor data manual" by Dave Bursky.
Gennadiy |
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