New tool to read openMSX savestates into MSX2 or FPGA

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By Manuel

Ascended (16864)

Manuel's picture

15-09-2020, 22:24

Well, it would cost 4 I/O ports... Now it's one memory location.

By mcolom

Expert (86)

mcolom's picture

15-09-2020, 22:42

Manuel wrote:

Well, it would cost 4 I/O ports... Now it's one memory location.

In the main system, moreover. Putting it as a memory location moves the complexity of the circuitry to the connected device. Perhaps that's the reason...

By pgimeno

Master (230)

pgimeno's picture

15-09-2020, 23:45

My (uninformed) guess is that as MMIO, it's automatically mapped to the currently selected primary slot in page 3, so that may mean less extra circuitry to let the user select the primary slot that the desired secondary slot mapping applies to.

By gdx

Prophet (3684)

gdx's picture

16-09-2020, 02:16

mcolom wrote:

Sure, and not taking that into account is a flaw of the sofware. That's why I said programmers without access to documentation.

I don't know where it came from but in Europe many people thought that MSX1 machines can't have expanded slots. I saw this several times at the time and many programs were developed like this. For cartridges this is understandable as MSXs normally have at least one primary slot but for other software I think there is false information that circulated.

By Grauw

Ascended (9285)

Grauw's picture

16-09-2020, 02:36

People drew conclusions based on a limited set of machines they had access to and circulated this as fact.

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