jltursan

Btw, any updates about this development?

Very good points, thanks!...in fact, I've missed that indeed INT6 is active low!... It's a bare A1200 motherboard, with PCMCIA, ClockPort or expansion connector in good shape. I've checked the resistance between pin 23 and 5V and indeed, it shows 1K while powered off. Same value against ground and also both values are mostly identical as the ones measured in U7. EDIT: So, cutting a track, I've isolated Paula from the INT line and now, the machine boots erratically, some times it sees the floppy others just hangs; but the couple of times it has boot the ATK, the CIA timers tests are mostly correct. Now I have CIAB TOD IRQ test passing OK and CIABTA/CIABTB failing with wacky values, far from the 21/22 expected. Also during the music test can be heard some very faint noises, something is trying to going on. Oh, well, that's something. Paula smells...I'm going to try socketing and replacing it.

I'm trying to diagnose and fix a rare fault in an Amiga 1200 rev.1D1 and it's driving me nuts. Testing the machine with Amiga Test Kit v1.20, all starts with the music module not being played at all (it happens also to a bunch of games, others play music fine) and the CIAB timer tests faults pointed out by ATK, it shows CIABTA, CIABTB and CIAB TOD IRQ as faulty. The test displays exactly this screen: Loss of int6 at even cia So, a naive approach suggests that INT6 signal is missing and the CIA is bad as appeared in the net in pages like this (being CIA-A/INT2 this time): A1200 CIA Timer Failure As I've already socketed U8 (Even CIA), I've replaced it with at least 6 new CIAs, some of them sourced from working motherboards (I mean, at least the CIA subsystem...) and none fixed the errors. The socket seems fine, I've checked the following: Socket is in good shape, no cracks. Every CIA-B pin seems correctly soldered and shows continuity with the rest of the components as shown by the A1200 schematics and Amiga PCB Explorer. No bridges between neighbouring pins. AFAIK, INT6 signal is generated by CIA-B itself and then injected to Paula (U3) and Gayle (U5). There's only a passive component (R954A) in the signal path and seems fine, measuring 1K. If I run the ATK music test and check pin 23 (INT) with an oscilloscope, I can't read anything at all, no signal, 0V. So, I'm wondering the following: Could it be that all my CIAs, even the ones working as CIA-A are faulty and can't generate INT signal?. I know that CIA-A INT signal must be a working IC as ATK tests passed OK 100%. Are any other signals involved in generation of INT6 by the CIA-B and some are missing or out of spec? Could a faulty Gayle or Paula pull down the signal and making it disappear?. I can try isolating the CIA pin; but I hate cutting tracks... Any help will be appreciated...

This thread is a really good reading, thanks to all involved! 👏 Now, does anyone have plans to build the compact version and make it available to purchase?, Hans?

FujiApple of course! (note that you need SmartPort support tho)

Can't check it right now; but Yoshida Takeda's emulators usually allow this feature: Common Source Code Project Look for EmuZ-700...

My vote goes to an FPGA core. Dual CPU systems (main+video) are hard to program: two separate RAM banks, tiny shared memory, semaphores...or maybe you've a cleaner approach? I've always considered the V6z80P of Retroleum the perfect example of a superb FPGA video graphics card implementation. Paired with a real Z80 is a really nice machine.

Sure, any info will be welcome! What are the key differences between both projects?, what do you mean by "full Zilog chipset", CPU+CTC?

Yep, I've faced the same "No files found" time ago until I found a compatible pendrive (beware, SD adapters seems more unreliable than true pendrives). Obviously, the weird problems seems not related the the USB drive being used. What EPROM or flash are you using?, do you trust 100% the RAM IC?

And some others seems to have arrived to Europe, one of my PC-6001 is a B model that AFAIK it must identify it as a British model.

Probably because the PC-6001 is the entry model for the NEC PC-6000 series. Seems that they messed up the names...

Not sure; but maybe you can find some info in this Lemon64 thread

Cool!; so there's a palette mechanism 😀 Any plans to implement some kind of raster interrupts (hsync, I'm assuming that vsync has already been tied to one 😉)?. Using timers you can program some raster effects; but usually having real hsync interrupts make things easier. And about your "blitter"....hardware sprites support?, logical operations between blocks transferred?

Great project!. IMHO I think that with no palette and a max of 8 colors (digital palette, I presume), the graphics are severely crippled. No mention to the max color resolution of 160x120. Maybe 19K for video are too little?; but I would go for something beefier like 160x120x8 palettized or 320x200x16 with no palette. Anyway, go for it!

Now you mention it, I don't know of any FPGA implementation of the Sorcerer. Seems a simple architecture; but who knows... The only "massive" storage solutions I know for the Sorcerer are the ClausB's Teensy-based tape reader and the uIDE; but this last one is only a possibility as it need to be paired with a complete set of drivers to be operative, and there're none right now.