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Description
8237A-5 P4 Channel Programmable Direct Memory Specifications 4 Independent Channels: Each channel can be individually programmed and has a 64K address and word count capability. Transfer Modes: Single Transfer: Releases the bus after every byte. Block Transfer: Moves the entire data block in one go. Demand Transfer: Continues transferring as long as the external device requests it. Cascade: Allows multiple 8237A chips to be "daisy chained" to increase the
4-Channel Programmable Direct Memory
Specifications
- 4 Independent Channels: Each channel can be individually programmed and has a 64K address and word count capability.
-
Transfer Modes:
- Single Transfer: Releases the bus after every byte.
- Block Transfer: Moves the entire data block in one go.
- Demand Transfer: Continues transferring as long as the external device requests it.
- Cascade: Allows multiple 8237A chips to be "daisy-chained" to increase the number of channels (e.g., how the IBM PC used two 8237s to get 7 channels).
- Memory-to-Memory Transfer: It can move data from one memory location to another, a feature not found in many other DMA controllers of its era.
- Auto-Initialization: Allows a channel to automatically re-load its original starting address and word count after a transfer finishes (useful for repetitive tasks like CRT refreshing).
Additional Information
| Device | Programmable Memory |
Shipping Notes
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Exchange/Return Notes
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4.4 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Great product
Husband loves this warm but lightweight pullover.
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Reviewed in the United States on April 1, 2026
★★★★★ 4
sleeves long
I'm 5'6" and stocky but the sleeves are too long and slip over to rest half way down my hand. If your 5'9 or taller you will be fine.
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Reviewed in the United States on December 15, 2025
★★★★★ 5
Quarter zip
Great quarter zip, high quality, very nice material and comfortable. Buying 5 more colors
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Reviewed in the United States on February 16, 2026
★★★★★ 5
Great fit
Color: Cream, Size: X-Large
Great fit and feel- my son loved it
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Reviewed in the United States on March 6, 2026
★★★★★ 5
Highly recommend
Big fan, have purchased multiple
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Reviewed in the United States on April 1, 2026