pragsmatic
Right off the assembly line
You have a 8085 processor, and have to interface these memory chips to the 8085 to make a working system:
2764 (8K x 8 EPROM) x2
6264 (8K x 8 SRAM) x2
2114 (1K x 4 SRAM) x8
Q1) What memory map would you choose for your system, and why.
Q2) It is now found that the 2114s are very slow. (It is because of this that these are almost free). Can you accomodate this lack of speed in your design, and if so how?
Q3) It is now decided to introduce an extra simple Output port using a 74LS374. Other considerations also mean that it has to be in the memory adress space. Show how you would go about achieving this.
Q4) There is an internal discussion on increasing throughput by introducing DMA in your existing design. Explain to your marketing and finance people how DMA helps. Work out how it can be introduced in your system so that you can give the finance people an estimate of the cost increase.
2764 (8K x 8 EPROM) x2
6264 (8K x 8 SRAM) x2
2114 (1K x 4 SRAM) x8
Q1) What memory map would you choose for your system, and why.
Q2) It is now found that the 2114s are very slow. (It is because of this that these are almost free). Can you accomodate this lack of speed in your design, and if so how?
Q3) It is now decided to introduce an extra simple Output port using a 74LS374. Other considerations also mean that it has to be in the memory adress space. Show how you would go about achieving this.
Q4) There is an internal discussion on increasing throughput by introducing DMA in your existing design. Explain to your marketing and finance people how DMA helps. Work out how it can be introduced in your system so that you can give the finance people an estimate of the cost increase.