Recent content by Zare

@MiaM the chip used is Faraday FE2000 thus the board has some discrete components like the timer, interrupt ctrl, DMAC, bus drivers, etc. Fully integrated is larger FE2010. These both chips are capped to 33% duty cycle from 14.3 MHz oscillator, 4.7 MHz system only. However there are pin...

IMO Prodest riser not a bad thing to have for M19. P.S. btw I've been using Ghislain's internal riser for some time now in my M19 for XTCF and EMS card. Fits great :)

Ah ok I see, you presume these fakes are V20HL 10 MHz variant too.

But D70108D-10 should not be able to run at 12 MHz let alone 16. D70108H-16 did not exist in 1984 tho, so the label has to be fake. Doh on my side. But still the price is worth it... Maybe it is possible to discern V20HL from regular V20 by looking at power usage on 100% CPU load on same...

Hm. Not good. I'm still going to try. Maybe it will behave correctly when bumped up to 14.3 MHz for a few clock cycles at a time.

@sqpat thanks for posting that. I wasn't aware. Ordered one off ebay months ago. The pins are shiny and the label does look too new. Do you think this is fake?

Yeah. I think there is easy way and complicated way. 16 MHz execution speed means the state machine transitions do not align cross-domain and that's a problem for Tw. But they would, if I used *2 speed. I think I can track S0-2, READY and RQ/GT lines to know when the CPU spends the following...

Can you report what is the best frequency you can play 4 voice mod file in ACC1 mode in Mod Master XT?

What exact "digitized sound" does not work? If RAM is mirrored on board, DMA is not going to work, so if program sends samples over DMA to SB, that's a problem.

The problem is there are two turbos, one on XT, and one afterwards. They may do the same thing, but not in the same context. When first turbo XT mainboards appeared the PC XT was still the yardstick in computing and not an obsolete thing. Hence the name 'turbo' is appropriate. You want to run...

Quantum computing is kind of a hype, they've started really really 'communicating the science' lately, in last two years. And I read that as 'we have no real application and are throwing it out there'. Just like LLMs. Well imagine telling customers, you should upload your data to our network...

A lot can be done if FPGA is tied to both CPU socket and PC bus. For my XT, I have such a plan for the onboard graphics card. It is a CGA that has video generator section integrated in a Paradise chip, in socket. The downside is refresh rate in Olivetti 640x400 mode (main mono video output)...

If I put my tinfoil hat on I can see the thread between big data, cloud and AI, three hypes in 15 years. Add in IoT there too. I'm not saying companies were coerced to collect all the data including transitives with personal, sensitive information that has no place being persisted anywhere...

I'm aiming here to make a generic upgrade, not something particular to a mainboard type. Yes, there are definitely turbo XT mainboards that employ this kind of a circuit internally - anything that can run CPU above 10 MHz has to manage a lower bus speed, and there are 16 MHz CPU capable boards...

Thinking about a project for in-CPU-socket adapter card using V20 16 MHz regardless of the host bus speed. Initial idea was to use FPGA to align cross clocking of the bus but then I realized why just not run CPU at bus speed when bus access is going on, and at full speed otherwise. This would...