Inside the first personal computer: Kenbak-1
Kenbak Coding Sheet
This sheet (the Kenbak Coding Sheet) tells just about all there is to know about the Kenbak-1.
There were three programming registers, A (location 000), B (001), and X (002) which were assigned locations in the memory. The X register was for memory indexing but could be used in any way you liked. The program counter was P and it was memory location 003. The lights displayed the contents of location 200. Input was made to 377. Operations that could be performed on A, B, and X were Addition, Subtraction, Load, Store, Logical Or, Logical And, Load Negative. The addressing modes were Immediate, Memory, Indirect, Indexed, and Indirect/Indexed. One could do things like subtract the contents of A from A which yielded Clear A.
Reprinted with permission from Vintage-Computer.com
There were three programming registers, A (location 000), B (001), and X (002) which were assigned locations in the memory. The X register was for memory indexing but could be used in any way you liked. The program counter was P and it was memory location 003. The lights displayed the contents of location 200. Input was made to 377. Operations that could be performed on A, B, and X were Addition, Subtraction, Load, Store, Logical Or, Logical And, Load Negative. The addressing modes were Immediate, Memory, Indirect, Indexed, and Indirect/Indexed. One could do things like subtract the contents of A from A which yielded Clear A.
Reprinted with permission from Vintage-Computer.com
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Earlier computer
erkantor@... | 07/29/06
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IBM 1620
Nils5906@... | 07/29/06
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My First Too!
d_baron@... | 08/22/07
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The Kimbak is older than the OSI
filker0 | 07/30/06
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The Altair is the first in kit form
Falcon318 | 08/18/06
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The Trs-80 is the first
Dr Dij | 08/22/07
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Schelbi 8008
clarelove@... | 08/22/07
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RE: Kenbak-1 (Inside the first personal computer: Kenbak-1)
ewhite@... | 08/22/07
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Hehe
Spiritusindomit@... | 08/22/07
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RE: Kenbak-1 (Inside the first personal computer: Kenbak-1)
bbell@... | 08/22/07
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thinking of classic we have...
david_worden84@... | 08/22/07
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RE: Kenbak-1 (Inside the first personal computer: Kenbak-1)
elecctron@... | 08/22/07
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Cuando el producto final no hace lo que tiene que hacer, aplica un H0TF1X--
elecctron@... | 08/22/07
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