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404. I guess you forgot to make the repository public?

If it worked before sitting idle for 9 years and now blows fuses, I'm going to guess that you have one or more dead electrolytic caps. As for why you don't have a start-up chirp, start with the basics: check the main board's power rails first, and if those look OK, make sure the 6502 has a good...

...and they're put into a washing machine after soldering, too. Anyway, another way to help drive out water after a wash-down is to liberally spritz the board with ~90% IPA. The alcohol will readily mix with the water, and the result is much more volatile than just the water alone. Then, if...

I don't have any experience with those, alas, so cannot offer any advice about them.

The failure mode is particularly brutal (the regulator, which has been helpfully potted in epoxy to ensure maximum heat retention, croaks and dumps unregulated DC onto the 5V rail). MOS's chips are fragile enough as it is, they don't need any "help" from an over-voltage condition :)

Basics first. Get the schematic for the rev of board that you have, and start by verifying that you have the correct voltages on the various voltage rails. Do you have an oscilloscope? [EDIT: Hit "send" a little too quickly...]

Well, the 74LS161 worked, and it's a 14ns part, so if you used a 25ns GAL, I'm going to guess that's why it doesn't work. I guess the 15ns 16V8s you have are dead. You could always try new production Atmel ATF22V10 15ns parts, but the older TL866 won't program them; you'll need a TL866-II.

Which speed grade of 16V8 did you use?

Both mini and large boards no longer available at the developer's Shopify (and my understanding is that he does not intend to sell any more via that site), and VGP (the UK distributor) is out of stock of both, at least for now. I'm checking every week or so to see if VGP gets more stock...

The Kawari replaces both the PAL and NTSC version of the VIC-II. The big problem right now simply supply of the board. I am in the same boat (my 326298 Rev A board has a dead 6567R56A). I have heard that there may be additional supply available from the UK distributor sometime in December.

Howdy folks! I have a C64 (326298 Rev A - lucky me!) with a Eurostile font keyboard. When I received the machine, the left shift key was broken. The key is salvageable (just need to get the broken post out of it -- my son is convinced he can do it), but I obviously need a new plunger to...

Very nice!

Thanks, Steve! This was really helpful!

Howdy folks ... There was an exhibitor at VCF West 2023 listed as this on the exhibits page: I was sure I grabbed one of his cards, but if I did, I've misplaced it, as it is not among the other business cards, etc. that I took from other exhibitors. Does anyone happen to recall who this was...

You basically need some circuitry that latches the RAS and CAS at the right times to generate the appropriate linear address (and chip select if you e.g. use 2 32KB SRAM chips). This isn't particularly difficult. The biggest challenge will be laying out the PCB so that you can hit all 8...

Jameco is a Silicon Valley institution. I buy from them a lot (and a big bonus for being only about 20 miles from my house, so even the cheap shipping option is super fast ;)).

jameco.com has "IC 2114N-2 CMOS SRAM 4096-Bit (1024x4) 200ns" in stock for USD $5.95. They tack on an extra fee if your order is less than USD $20, and I don't know what the shipping to Oz will be, but they at least have the parts. Just pick up a few other random parts while you're at it to...

Ok, I double-checked just to make sure I wasn't making some dumb mistake: dhcp-194:thorpej$ cat oink.s .text .globl _start _start: ldrh r8, [r12, #0] .word 0xE1DC80B0 dhcp-194:thorpej$ armv4--netbsdelf-eabi-as oink.s dhcp-194:thorpej$ armv4--netbsdelf-eabi-ld...

Yes, ARM7TDMI and ARM7500 are both ARMv4. That looks to me like it's just "ldrh r8, [r12, #0]" ? P=1,W=0 (offset addressing), I=1 (8-bit immediate in addr_mode field of opcode), U=1 (add offset to base). Note that the result is defined as UNPREDICTABLE if the effective address is not 16-bit...

You can't change the response to START_UP. You have to respond with what the NABU boot ROM expects, otherwise it's just going to give up and report ADAPTOR FAILURE. In any case, it looks like you've resolved your problem using a different network serial adapter. That's great, I'm glad it's...