8257 DMA Study Card + FRC Manufacturer,Supplier and Exporter in India
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Product Code : SCL-EELE-13199
Indian Lab Suppliers supplies the 8257 DMA Study Card + FRC (Product ID: 13199) as part of its electronics engineering lab equipment range. It is a study card for the 8257 programmable DMA controller, with on-board RAM and LEDs on the bus and DMA handshake signals.
Quick Answer
Direct memory access lets data move between an I/O device and memory without passing through the processor, which hands the bus to the DMA controller. On this card an 8257 transfers data to or from 2 KB of on-board RAM (6116), with eight inputs on terminals, each with a 3 mm LED. LEDs also show AD0-AD7, chip select, read, write, A0-A3, memory read and write, I/O read and write, and the AEN, MARK, TC, HRQ and DACK0-DACK2 signals, so each step of a transfer can be followed. A micro switch provides hardware single-stepping, and the card connects to 8085 or 8086 trainer kits through a 50-pin FRC cable, with a user manual and sample programs.
Key Specifications
| Parameter | Detail |
|---|---|
| Device | 8257 DMA controller |
| On-board RAM | 2 KB (6116) |
| Inputs | 8, on terminals with LEDs |
| LED indication | AD0-AD7; CS, RD, WR, A0-A3; MEMR, MEMW, IOR, IOW; AEN, MARK, TC, HRQ, DACK0-DACK2 |
| Execution | Hardware single step (micro switch) or full clock |
| Connection | 50-pin FRC to 8085/8086 trainer bus |
| Documentation | User manual with sample programs |
Where This Is Used
It is used in advanced microprocessor courses to show the hold/acknowledge sequence and terminal count of a DMA transfer. Please confirm the bus connector matches your trainer at quotation. Related study cards are 8255 PPI Study Card + FRC (Product ID: 13195) and 8251 USART Study Card + FRC + Serial Cable (Product ID: 13198). Related items: 8279 Keyboard & Display Controller Card + FRC (Product ID: 13201). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
What is DMA?
A transfer between a device and memory handled by a controller instead of the processor.
Is memory provided for the transfers?
Yes, 2 KB of RAM on the card.
Which DMA signals are shown?
AEN, MARK, TC, HRQ and DACK0-DACK2, among others.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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