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    Help with Top3000 Programmer Drivers

    Can anyone please upload the version from 12 may 2022? https://pan.baidu.com/s/1hqJdtpq#list/path=%2F
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    NEO-BUF, Eagle and half-vias

    Thank you! I think i understand it now a little better: 1. no castellated holes: when the board is completed, the vias are cut in half. 2. castellated holes: after the cut, the holes are plated. (JLC calls it a special process) What i don't understand about castellated holes on JLC: The...
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    NEO-BUF, Eagle and half-vias

    Yes, a flex pcb will be a lot better, but more expensive and it will not be worth it. The design is just at the limit of the jlc specs for 2 layer pcb. If they will accept to do it without the castellated holes option the price will be 10$ for 100 pcs or 11$ for 200 pcs, plus 6-7$ for shipping...
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    NEO-BUF, Eagle and half-vias

    I understand. It seems to be a lottery, especially for 0.3mm holes.
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    NEO-BUF, Eagle and half-vias

    How do you do it? You keep the dimension outline in the center of the hole?
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    NEO-BUF, Eagle and half-vias

    I'm trying to make my own NEO-BUF using TSSOP20 because my eyes can't handle QFN anymore. The story so far... NEO-BUF has a 0.8mm pitch. I used square pads with a diameter of 0.6mm and a drill of 0.3mm. The outline in the dimension layer is 0mil and it is positioned in the center of the hole...
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    MV-1A repair questions

    Update 2: I tested on 1FZ the z80 that was on 1A and it's good. I tested the z80 from the game gear and it's dead. UPDATE3: now i don't get any more errors in neodiag. I guess the problem was one of the neo-buf because i've swapped them around. But i still don't get sound. Is my approach of the...
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    MV-1A repair questions

    I don't have audio connected, but i will connect it. When/if i will find another board i will swap the NEO-D0. There's still a low chance that the neo-buf is not 100% functional. Or maybe the replaced z80 is dead too, but i doubt it. I connected audio, but i've noticed that the pot on the pcb...
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    MV-1A repair questions

    :)) No. With no cart i get a solid color screen. With the neodiag cart i get: z80 dead / errored / com issue expected: c3 actual: 00 There's a neo-buf and 2 x 74hc273 related to z80. i've used the neo-buf fromnear the cart connector. I don't have 74hc, so I used 74LS. I also replaced the 2k...
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    MV-1A repair questions

    I will try tomorrow to find a 2k sram. On the Croms I'm lost. In my case it looks more like in the lorom picture. I made a neodiag cart. Cart or no cart inserted, I get this: z80 slot switch ignored (SM1) SM1 otherwise looks unresponsive. SM1 OE an CE go to NEo-IO and NEO-D0. I hope it's not...
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    MV-1A repair questions

    Thank you so much! Those links are really useful. I don't have a supergun. I just used wires on a jumma connector for video and power. And a few resistors to combine RGB so i could get a black and white image on my composite tv. Since i didn't have bram and no controller, neodiag was stuck at...
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    MV-1A repair questions

    Hi. I managed to get the board to boot the neodiag bios. Now i'm having the 3 following problems (among others): 1. backup sram is missing. In an online picture i can see that the sram is LH52B256N-70LL. Can i replace it with HSRM20256LM. I xould't find a datasheet, but on console5 it says it's...
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