View Profile: Dwight Elvey - Vintage Computer Forum

Yesterday, 02:02 PM

Dwight Elvey replied to a thread Frustrating Problem in CP/M and MP/M

Oops, I forgot about that. Dwight

132 replies | 5540 view(s)

Yesterday, 09:06 AM

Dwight Elvey replied to a thread Frustrating Problem in CP/M and MP/M

If you find a connector pin that is bad, depending on the type, these can be replaced. If you have a donor connector, most will push out from the...

132 replies | 5540 view(s)

Yesterday, 08:58 AM

Dwight Elvey replied to a thread PS/2 Floppy Repair in Vintage Computer Services Offered/Needed

So, it is still the juicy ones or the tantalums. Not just all of the capacitors. I generally don't look at the others. The newer surface mount...

17 replies | 546 view(s)

January 16th, 2020, 03:25 PM

Dwight Elvey replied to a thread PS/2 Floppy Repair in Vintage Computer Services Offered/Needed

When you say this, do you mean drives that load down the power supply or drives that only don't work. Most capacitor failures that I've seen are on...

17 replies | 546 view(s)

January 16th, 2020, 01:19 PM

Dwight Elvey replied to a thread Frustrating Problem in CP/M and MP/M

Check your regulators under full load. I had a N* that with no load, the 12V line looked fine. Once I had both drive starting, the 12V line would...

132 replies | 5540 view(s)

January 16th, 2020, 06:49 AM

Dwight Elvey replied to a thread PS/2 Floppy Repair in Vintage Computer Services Offered/Needed

I use a piece of tape, cut in a small strip, to tack the chip down while soldering the ends. After soldered, I remove the strip. Use separate rosin...

17 replies | 546 view(s)

January 16th, 2020, 06:23 AM

Dwight Elvey replied to a thread Intel SDK-86 in Other

There was one chip on the board, related to bus management, but I forget what is was, that is not available any more. I recall that when the board...

3 replies | 97 view(s)

January 15th, 2020, 08:22 PM

Dwight Elvey replied to a thread Video card help in Vintage Computer Hardware

If the board doesn't work, it is not likely the power line filter. I know this likely falls on deaf ears but replacing the capacitors is mot likely...

15 replies | 185 view(s)

January 15th, 2020, 04:15 PM

Dwight Elvey replied to a thread Video card help in Vintage Computer Hardware

Its a power rail capacitor. Check to see which rail it is on. 10 or 20 uf tantalum with sufficient voltage would be fine. Dwight

15 replies | 185 view(s)

January 15th, 2020, 07:50 AM

Dwight Elvey replied to a thread IMSAI 8080 noob, how to use? in S-100

To bad you don't have a Polymorphic video card. It also has a parallel input port that is designed to work with a parallel keyboard. There are...

7 replies | 315 view(s)

January 14th, 2020, 01:01 PM

Dwight Elvey replied to a thread best way to multiboot diferent dos versions. in Later PCs

Another option is to use a boot floppy. Dwight

24 replies | 679 view(s)

January 14th, 2020, 06:28 AM

Dwight Elvey replied to a thread What type soldering iron do you guys use? in General Off Topic

I'm with you. I like small flat tips. Pointed ones are hard to keep the tinning clean at the point. Dwight

33 replies | 586 view(s)

January 13th, 2020, 01:38 PM

Dwight Elvey replied to a thread KIM-1 interest? in Commodore

You can get most of the feeling with the various arduino emulators. These are small enough to hold in your hand. Dwight

15 replies | 422 view(s)

January 13th, 2020, 11:16 AM

Dwight Elvey replied to a thread Help identify old i8085 board (supposedly Xerox) in Vintage Computer Hardware

They all seem to start with 733W I suspect the 733 may be a model number. Dwight

16 replies | 248 view(s)

January 12th, 2020, 08:57 PM

Dwight Elvey replied to a thread overclocking in General Off Topic

Intel sells all range of designs for almost every ix number. I don't consider that to be a current design just because it says i5 They have been...

17 replies | 304 view(s)

January 12th, 2020, 03:37 PM

Dwight Elvey replied to a thread overclocking in General Off Topic

I'm not talking about the AMD 1600 chip. Dwight

17 replies | 304 view(s)

January 12th, 2020, 09:07 AM

Dwight Elvey replied to a thread Apple //e Clone (Orange ? ) in Early Apple (I, ][, ///, etc.)

Using that trouble shooting chart with a clone is likely to not help much. A 74LS109 and a 74LS10 are about as different as a motorcycle and a Mack...

8 replies | 287 view(s)

January 12th, 2020, 07:46 AM

Dwight Elvey replied to a thread overclocking in General Off Topic

It used to be that the processors always had what was called significant head room. This means they'd always have a relatively large safety band of...

17 replies | 304 view(s)

January 11th, 2020, 09:19 AM

Dwight Elvey replied to a thread What type soldering iron do you guys use? in General Off Topic

After all, they are called soldering pencils. One should hold it like a pencil, shouldn't one? Dwight

33 replies | 586 view(s)

January 11th, 2020, 09:14 AM

Dwight Elvey replied to a thread Frustrating Problem in CP/M and MP/M

Make sure to wash it off when done. The pins are only sliver plated. The metal below the silver will act like a battery and dissolve one of the two....

132 replies | 5540 view(s)

January 11th, 2020, 08:59 AM

Dwight Elvey replied to a thread KIM-1 interest? in Commodore

On 6502 stuff: On the KIM, I hope to get Peter Jennings' chess program onto the ROM of the diagnostic board ROM and also add some more of Jim...

15 replies | 422 view(s)

January 11th, 2020, 08:10 AM

Dwight Elvey replied to a thread Pet 2001 chiclet display problem in Commodore

We new the F000-F7FF and the D000-D7FF were bad but the C000-CFFF was showing data on the NOP test. It must have some bit errors. You'd need a...

275 replies | 7612 view(s)

January 10th, 2020, 11:14 PM

Dwight Elvey replied to a thread Drive parameters for Gotek USB disk in CP/M and MP/M

I think you're right. 250Kbs sounds right. Dwight

30 replies | 545 view(s)

January 10th, 2020, 09:57 PM

Dwight Elvey replied to a thread Drive parameters for Gotek USB disk in CP/M and MP/M

I could be wrong but I think 360K used 9 secdtors per track. You might want to look that one up. As was noted, the 720K 3.5" drive is 500kbits. Are...

30 replies | 545 view(s)

January 10th, 2020, 08:38 PM

Dwight Elvey replied to a thread What type soldering iron do you guys use? in General Off Topic

I'm like Chuck, I have an old Welller with the same handle but a different base ( same 24vac transformer ). I have tips for 6,7 and 8. I've even used...

33 replies | 586 view(s)

January 10th, 2020, 08:19 PM

Dwight Elvey replied to a thread KIM-1 interest? in Commodore

Using the VCF search is crappy. There is actually quite a bit of KIM-1 stuff here but you need to use a real search engine like google. The search...

15 replies | 422 view(s)

January 10th, 2020, 11:42 AM

Dwight Elvey replied to a thread Drive parameters for Gotek USB disk in CP/M and MP/M

Hi I'm still trying to make sense of what you are doing. On the first post you say that you got the Gotek that can do 720K 1.2m and 1.44M. It...

30 replies | 545 view(s)

January 10th, 2020, 06:16 AM

Dwight Elvey replied to a thread Drive parameters for Gotek USB disk in CP/M and MP/M

You are already beyond me. I am not familiar with ICES. I do know that HxC works with the Gotek and has built up a library of older disk formats. It...

30 replies | 545 view(s)

January 9th, 2020, 06:22 AM

Dwight Elvey replied to a thread When is the FAT saved? in Vintage Computer Programming

You can buffer it in RAM and periodically write out updates. Of course, you have to worry about power shut downs but that is life. Writing out every...

7 replies | 212 view(s)

January 8th, 2020, 09:34 PM

Dwight Elvey replied to a thread How to creating Flex-usable physical floppy disks, and writing to them? in Other

You have some time to make changes. I forget how long. It is not a good idea to make changes once someone replies to something you said. If you think...

9 replies | 206 view(s)

Dwight Elvey
Senior Member

Mini Statistics

Recent Visitors

Basic Information

About Dwight Elvey

Statistics

Total Posts

General Information

Dwight Elvey Senior Member

Mini Statistics

Recent Visitors

Basic Information

About Dwight Elvey

Statistics

Total Posts

General Information

Dwight Elvey
Senior Member