Started by stas2k, September 11, 2020, 05:21:41 PM
Quote from: stas2k on March 03, 2022, 10:49:53 PMSorry all, I have been away from the forums for a while. I still have remaining stock and sent out messages to those who wrote to me before.If you did not hear from me, I am out of boards and will not be producing more. This is due to 3x price jump on the SRAM chip prices. @PsychoLavos, your BOM is not correct on the SRAM chip area. You have 3.3v modules, and those will not be happy to work on a 5v system that is X68000. Mind you, it might work, but might also damage your precious system due to excessive current draw on bus pins. You will also have to program the GAL chip with JED files I published on github.I do have around 8 blank PCBs of the v2 version to sell, so feel free to contact me for those.
Quote from: stas2k on March 15, 2022, 07:19:40 AMI have found a source for SRAM and will be producing more boards in near future, so stay tuned.Might have to adjust prices after I source the GALs as well. Seems prices went up for every part under the sun.
Quote from: PsychoLavos on April 07, 2022, 07:16:46 AMWould those parts work with a V1.2 revision board?
Quote from: PsychoLavos on April 01, 2022, 04:58:26 AMIf you are able to get a hold of new SRAM chips, is there anyway I could buy 4 Chips off of you? The Chips from Aliexpress arrived this week at my friend's house & I'm planning on refunding them if I can.
Quote from: stas2k on April 11, 2022, 07:36:00 AMQuote from: PsychoLavos on April 07, 2022, 07:16:46 AMWould those parts work with a V1.2 revision board?All boards use the same SRAM chips. Only difference is in the package of the GALs.Quote from: PsychoLavos on April 01, 2022, 04:58:26 AMIf you are able to get a hold of new SRAM chips, is there anyway I could buy 4 Chips off of you? The Chips from Aliexpress arrived this week at my friend's house & I'm planning on refunding them if I can. Nope, I will only sell built and tested boards not to go down support rabbit hole. I recommend googling around and trying to source your own. I do not recommend you try to build your own board unless you have significant experience in soldering small pitch SMD parts.
Quote from: PsychoLavos on April 11, 2022, 01:46:58 PMI'm just asking if I could get chips from you, or if you could PM me the supplier you've found
Quote from: stas2k on July 27, 2022, 06:29:08 PMHello again! I will have a fresh batch of new boards built up this weekend. Feel free to PM for orders, and sorry about the price increase. SRAMs became super hard to find, and Mouser jacked up GAL prices as well.
Quote from: letchuck on January 02, 2023, 05:28:19 AMSo, stas2k logged 2 times since I wrote him in PM that I'm interested into buying one but I newer got an answer. I assume then that he doesn't botter to sell them anymore. Does anybody have a clue for another memory upgrade that one cane actually buy?
Quote from: HIggy on March 03, 2023, 07:42:20 AMThat looks great work @ymos16 the soldering on the Ram chips looks very fine!I am still rocking 1mb hopefully will have a 1mb upgrade on its way. At the moment it is not worth using SASI as I only have about 400K free after booting an HD image!
Quote from: aotta on March 13, 2023, 06:54:53 AMCEM5 = MS10 * A23 * /A22 * /A21 * /NAS ;0x800000-0x9fffff
Quote from: mikewolak on March 16, 2023, 08:36:44 AMOn second thought, regarding:Quote from: aotta on March 13, 2023, 06:54:53 AMCEM5 = MS10 * A23 * /A22 * /A21 * /NAS ;0x800000-0x9fffffDid you modify the board to have a 5th chip enable along with an extra SRAM? Everything else looks OK besides that line and MS10 * A23 * /A22 * /A21 * /NAS . If you removed those lines you would end up having 7MB of ram, with 1/2 of the 1st SRAM unused which I believe is your only option if you didn't modify the original schematic.
Quote from: mikewolak on March 17, 2023, 01:15:22 AMOk, in that case you should be good. Since you used a dip PAL in your design I say just give it a try and see what happens using mtest.x or some other memory checker after setting switch.x to the proper memory configuration. When I test I'm only going to solder the first 2MB chip to ensure the masking logic is valid.