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plazma

SRAM for C64 (and maybe 600XL)

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I made a compact PCB which replaces DRAM with SRAM and fixes the VSP bug. It fits 466 & 469 motherboards. I'll place some for sale after I receive the correct SRAM chips. I ordered wide SOIJ case by accident. It did fit the PCB anyway and I could test the protype. This should also work with 600XL. My 600XL is dead at the moment so can't test. 

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On 6/24/2019 at 5:36 PM, plazma said:

I made a compact PCB which replaces DRAM with SRAM and fixes the VSP bug. It fits 466 & 469 motherboards. I'll place some for sale after I receive the correct SRAM chips. I ordered wide SOIJ case by accident. It did fit the PCB anyway and I could test the protype. This should also work with 600XL. My 600XL is dead at the moment so can't test.

 

I thought VSP has become less of a bug and more of a feature.

 

@norm8332 beat me to it :)

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VSP trick is used for horizontal scrolling. The VSP bug crashes machines when using sw with the VSP trick.

One of the games using the VSP trick is Mayhem in Monsterland. 

 

Machines with the VSP bug may hang or have glitches when using SW with the VSP trick. With this SRAM board that bug is gone and VSP trick  SW works. 

http://www.linusakesson.net/scene/safevsp/

Edited by plazma
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1 hour ago, plazma said:

VSP trick is used for horizontal scrolling. The VSP bug crashes machines when using sw with the VSP trick.

One of the games using the VSP trick is Mayhem in Monsterland. 

 

Machines with the VSP bug may hang or have glitches when using SW with the VSP trick. With this SRAM board that bug is gone and VSP trick  SW works. 

http://www.linusakesson.net/scene/safevsp/

 

If that's how it works, great. Thanks for clearing it up.

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You reference the use in a 600XL - Lotharek in Poland has recently introduced an SRAM module that he is (or very soon will be) selling in versions for a number of retro 8-bit systems, including the A8 (XL and XE models), some Sinclair models and a few others I believe. 

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