plazma Posted June 24, 2019 Share Posted June 24, 2019 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. Quote Link to comment Share on other sites More sharing options...
norm8332 Posted June 26, 2019 Share Posted June 26, 2019 Nice, but you really don't want to fix the VSP bug since some games and demos use it. Super Mario Bros comes to mind... Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted June 26, 2019 Share Posted June 26, 2019 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 Quote Link to comment Share on other sites More sharing options...
plazma Posted June 26, 2019 Author Share Posted June 26, 2019 (edited) 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 June 26, 2019 by plazma 2 Quote Link to comment Share on other sites More sharing options...
plazma Posted June 26, 2019 Author Share Posted June 26, 2019 You can use the VSP Lab program to check if your machine got the VSP bug. Let it run for few hours. The bug may appear after the chips warm up. https://csdb.dk/release/?id=120810 Quote Link to comment Share on other sites More sharing options...
norm8332 Posted June 26, 2019 Share Posted June 26, 2019 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. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted June 26, 2019 Share Posted June 26, 2019 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. Quote Link to comment Share on other sites More sharing options...
plazma Posted June 28, 2019 Author Share Posted June 28, 2019 Received the correct SRAM chips. Looks little better. 3 Quote Link to comment Share on other sites More sharing options...
shoestring Posted August 18, 2019 Share Posted August 18, 2019 This should also work in some XEs and the later Apple IIes ( Platinum board ) with the two 4464 DRAM configuration. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted August 19, 2019 Share Posted August 19, 2019 That looks really nice. Are you selling these? I might want to grab a couple for the inevitable need. Quote Link to comment Share on other sites More sharing options...
R.Cade Posted August 19, 2019 Share Posted August 19, 2019 14 hours ago, shoestring said: This should also work in some XEs and the later Apple IIes ( Platinum board ) with the two 4464 DRAM configuration. Both my 130xe's have 16 * 4164's in them... Did they make a revision with 4 * 4464's? Quote Link to comment Share on other sites More sharing options...
shoestring Posted August 19, 2019 Share Posted August 19, 2019 (edited) Yes. This is my 65XE below which I practically rebuilt ( if you're wondering about the sockets ). Atari did use the 130XE PCB in later 65XE models, presumably to save costs and just use the same PCB layout for both. As you can see the 2 other rams and EMMU are missing. And a 130XE with 4 x 4464 dram. Edited August 19, 2019 by shoestring Quote Link to comment Share on other sites More sharing options...
plazma Posted August 19, 2019 Author Share Posted August 19, 2019 5 hours ago, OLD CS1 said: That looks really nice. Are you selling these? I might want to grab a couple for the inevitable need. Yes. I sell them. I have tested it with C64 250466 & 250469 motherboards only. Kit 12€. Assembled 17€. Shipping EU 2,30€. Non-EU 3,50€. Quote Link to comment Share on other sites More sharing options...
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