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Corrected 6800 to 68000 in last paragraph.
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edit approved Sep 11, 2020 at 17:19
Russell Borogove
edit approved Sep 11, 2020 at 17:19
Russell Borogove
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I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this - What: what would I need to do to make SDRAM work with a MC6800MC68000? I know that it needs a refresh clock, so would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)? What else do I need to look out for if I want to use SDRAM?

I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this - What would I need to do to make SDRAM work with a MC6800? I know that it needs a refresh clock, so would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)? What else do I need to look out for if I want to use SDRAM?

I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this: what would I need to do to make SDRAM work with a MC68000? I know that it needs a refresh clock, so would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)? What else do I need to look out for if I want to use SDRAM?

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Tristan
Tristan
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I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this - since SDRAM and SRAM are actually quite similar, besides the difference ofWhat would I need to do to make SDRAM needingwork with a MC6800? I know that it needs a refresh clock, so would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)? What else do I need to look out for if I want to use SDRAM?

I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this - since SDRAM and SRAM are actually quite similar, besides the difference of SDRAM needing a clock, would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)?

I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this - What would I need to do to make SDRAM work with a MC6800? I know that it needs a refresh clock, so would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)? What else do I need to look out for if I want to use SDRAM?

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Tristan
Tristan
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Using SDRAM with a MC68000

I'm currently working on developing myself a computer based on the Motorola 68000 CPU and am currently working on the RAM interface. Since I want a basic multitasking OS, I want to use 1 MB of RAM. SRAM of that size is hideously expensive (around $25) but SDRAM of the same size and speeds exceeding what I need are much cheaper.

The question is this - since SDRAM and SRAM are actually quite similar, besides the difference of SDRAM needing a clock, would that clock need to be my system clock (20 MHz) or my bus clock (System Clock/4 = 5 MHz)?