Stock Availability is only from our Samrand branch. ORDER fulfillment IS ONLY VIA OUR PREFERRED COURIER

Menu
0

Stock Availability is only from our Samrand branch. ORDER fulfillment IS ONLY VIA OUR PREFERRED COURIER

0

Your Cart is Empty

8237A - 5 P - Interface ICs -

8237A-5 P

SKU: 8237A-5 P

BRAND: Communica



R 18.98 (inc VAT)
R 16.50 (ex VAT)

🚚
Delivery time: 2-5 working days for South Africa
✓
In stock - Ready for immediate dispatch
Free shipping for orders over R1,000.00

Collections:

Type: Interface ICs

Category: Direct Memory Access Controller

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

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)