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Re: HardMPU, anyone?

Posted on 2017-01-29, 13:24

Yes, Gateway is complaining of not finding a MPU on IRQ2. Now about those clock fuses again. There's a bit of ambiguity in the software of my programmer (TL866, aka MiniPro) regarding how the fuses are to be programmed. For external clock you want the 4 fuse bits to be "0000" However the fuse …

Re: HardMPU, anyone?

Posted on 2017-01-29, 04:59

Some quick (bad) news. I got the LS240 (they're actually HCT240, compatible), installed it, fired a test PC with some games on it. The test PC is a 386-40 (the CPU is a TI486DLC) with 16MB RAM and a microdrive for HDD. I only tested with Secret of the Monkey Island (EGA version plus MT32 patch). I …

Re: CVX-2 : covox adapter

Posted on 2017-01-28, 16:24

I just did a few recordings with the new setup, but... they're not good. Technically I mean. Nothing worth posting. The sensitivity of the line input in the new setup is too low, even with the volume cranked up to the max it's still barely audible. I even tried it with the CVX-1 which was giving me …

Re: CVX-2 : covox adapter

Posted on 2017-01-28, 13:08

I will try to make another set of recordings today using a different machine, which has an actual line input. It's a new laptop that I never used for recording before, so we'll see how that goes.

Re: HardMPU, anyone?

Posted on 2017-01-28, 03:52

I received the 20MHz crystals today. Unfortunately the LS240 chips didn't get here, and according to tracking they may not be here until Monday or Tuesday, which delays testing.

Re: CVX-2 : covox adapter

Posted on 2017-01-27, 01:17

So I built a CVX-3 with 100k/200k ladder (using 1% 100k resistors) and 2 output variants: 25kohm load resistor and no capacitor, and no resistor but with 4.7nF capacitor. I recorded Crystal Dreams 1 demo with both setups and uploaded them here. Testing method was exactly the same as in my previous …

Re: HardMPU, anyone?

Posted on 2017-01-26, 03:10

So I think that makes those two cards cousins! Yup, hillbilly cousins. The top one with the "underground" connector and improvised fuse holder. the bottom one with the potentiometer precariously hanging by a few re-purposed cut resistor terminals and missing the last part - the output jack. (I hit …

Re: HardMPU, anyone?

Posted on 2017-01-26, 00:50

I think these are cute together. Just finished the bottom one. Or almost finished, I'm missing the output jack. Off to Radio Shack tomorrow, I think I saw there something that may fit.

Re: HardMPU, anyone?

Posted on 2017-01-25, 02:12

Well I'll wait for the 20MHz crystal to get here, should be about the same time the 240 arrives. Also I removed the optocoupler socket and soldered it directly. It's because the 6N136 chips I have are the short-leaded type with only stubs of the thin part of the leads, and curved horizontally so it …

Re: HardMPU, anyone?

Posted on 2017-01-25, 01:57

Card almost complete. I managed to scrounge most of the ICs except for a LS240. I don't have one, period. Waiting for the ones that should be in the mail already. Well, that and a 20MHz crystal. I only have 16MHz and 24MHz ones - but there's a small lot of the 20MHz in the mail heading for me too. …

Re: HardMPU, anyone?

Posted on 2017-01-24, 13:52

Quick teaser. Here's what I got in the mail last evening. :) https://s29.postimg.org/c5vhp9213/20170124_084317.jpg (edit) Small delay encountered, turns out I don't have several of the ICs in PDIP package (I have them as SOIC only) so it will be a few days until I can finish assembling it. I will …

Re: CVX USB Parallel Port experiments

Posted on 2017-01-22, 13:56

Yes I had to use a similar method to get the Willem working with the USB/LPT adapter in Win7. But it proved to be troublesome so eventually I delegated one of my vintage laptops with Win98 and a real LPT port to eprom-burning duty. That's why I haven't been really using the USB/LPT adapter for a …

Re: CVX USB Parallel Port experiments

Posted on 2017-01-21, 14:16

I have one of those usb-to-true-LPT adapters. Works quite well, but needs Windows drivers. Which one, which chipset does it have ? TBH I don't know. I got it about 2 years ago off ebay- it's a Chinese clone, but works well with Willem's programmer (also a Chinese clone) using the USB2LPT driver. I …

Re: CVX USB Parallel Port experiments

Posted on 2017-01-20, 04:10

I have one of those usb-to-true-LPT adapters. Works quite well, but needs Windows drivers. I doubt it would work in DOS. I haven't thought of using it for Covox, but may take a stab at it perhaps next week. Sorry, I'll be at work all week-end and a few days at the beginning of the week before …

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