View Profile: Hugo Holden - Vintage Computer Forum

Yesterday, 07:25 PM

Hugo Holden started a thread Bytesaver, block move program & BASIC-5 in S-100

The 2708 UV EPROMS finally arrived in the post from Germany. I got the Bytesaver up and running with Processor Technology's BASIC/5 in PROMS. The...

0 replies | 67 view(s)

Yesterday, 01:04 PM

Hugo Holden replied to a thread runaway shipping cost on fleaBay in General Off Topic

I found an interesting anomaly on Ebay with the GSP. I was wanting to buy a five IC's from a fellow in the USA. He had specified in his auction...

27 replies | 1342 view(s)

Yesterday, 12:52 PM

Hugo Holden replied to a thread Repairing Oliveti M24 monitor in PCs and Clones

I have attached a block diagram which might help make sense of my post on the topic. In the early days of TV's and video monitors, the phase...

20 replies | 664 view(s)

Yesterday, 05:12 AM

Hugo Holden replied to a thread Making your own floppy cleaning disks in Vintage Computer Hardware

I think you would have to be careful with the material, especially not run it for too long if it was paper based. For example, polishing metal,...

5 replies | 81 view(s)

Yesterday, 04:35 AM

Hugo Holden replied to a thread Repairing Oliveti M24 monitor in PCs and Clones

I agree with Dwight. What is happening when you adjust the H hold is that the picture can be made to appear normally, but it is drifting left or...

20 replies | 664 view(s)

January 24th, 2021, 08:22 PM

Hugo Holden replied to a thread Sanyo VM 4509 DC adapter in Vintage Computer Hardware

It says 17W power consumption on 12V, so the adapter would have to be capable of a minimum of 17/12 Amps. So a 1.5A rated adapter would just do it,...

5 replies | 79 view(s)

January 24th, 2021, 03:24 AM

Hugo Holden replied to a thread Apple ][+ rolling video started today in Early Apple (I, ][, ///, etc.)

Yes, if its is rolling vertically on both monitors, and won't come into vertical lock, it suggests something has happened to the vertical sync pulse...

7 replies | 140 view(s)

January 24th, 2021, 03:19 AM

Hugo Holden replied to a thread Dummy Load in PCs and Clones

It might or it might not stay on. With the current drain from the dummy load, this tends to store some energy in the the filter inductors and...

11 replies | 220 view(s)

January 23rd, 2021, 07:02 PM

Hugo Holden replied to a thread Apple ][+ rolling video started today in Early Apple (I, ][, ///, etc.)

Apple II vdu's as far as I recall have a very conventional H & V scan system (much like a standard video VDU). Which means they have separate...

7 replies | 140 view(s)

January 23rd, 2021, 06:16 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

I have made some progress. I have replicated the top and bottom track layout of the adapter board. I have attached an image of the overlaid tracks &...

32 replies | 572 view(s)

January 23rd, 2021, 01:19 PM

Hugo Holden replied to a thread Vertical line on a Lear Siegler ADM-3A Terminal in S-100

Most of the time with a CRT monitor, it is usually fairly fairly easy to deduce where the problem is looking at the screen (though there are a few...

2 replies | 103 view(s)

January 22nd, 2021, 09:52 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Dwight, Yest that is the one. I think it is a very impressive card. I have been reading about its functions & options. Rockwell made it so...

32 replies | 572 view(s)

January 22nd, 2021, 02:52 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Dwight, I decided to use the Euro connector version on both the adapter and the the video board. The reason being that the adapter board...

32 replies | 572 view(s)

January 21st, 2021, 04:58 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

I like to replicate vintage pcb's as closely as possible, it seems to increase the probability of it working out. I have been looking into the...

32 replies | 572 view(s)

January 21st, 2021, 01:36 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Thanks for that link to the book ! The schematic matches another photo of the card (attached that has two LS240 and a LS640). So from this I can...

32 replies | 572 view(s)

January 21st, 2021, 05:30 AM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Thanks Dave, that is very helpful to see the exact document. I can make the interface from that. One of the problems I have quickly discovered for...

32 replies | 572 view(s)

January 21st, 2021, 01:55 AM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Mike, When I read this I had no idea what AH5050 meant. So I searched and found the attached information. If I was going to be able to set this...

32 replies | 572 view(s)

January 20th, 2021, 08:32 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Yes that sounds like a good option, but I want to run just the video card and composite video monitor with my AIM-65 so as to keep using the AIM's...

32 replies | 572 view(s)

January 20th, 2021, 04:57 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

There was a remark on Han's website about this book: Datasheets of all available RM 65 modules are described in Chapter 9 of the 1984 Synertek...

32 replies | 572 view(s)

January 19th, 2021, 05:38 AM

Hugo Holden replied to a thread AT PSU schematics. in Vintage Computer Hardware

Most of the time with these sorts of supplies, you can repair them without the schematics. The first move is to re-cap them replacing every...

2 replies | 74 view(s)

January 19th, 2021, 03:32 AM

Hugo Holden replied to a thread Fun with New AIM-65 in Vintage Computer Hardware

I found this attractive sketch on the back cover of a vintage 1981 Rockwell IC manual. Rockwell probably made a lot of electronics gear for the...

6 replies | 153 view(s)

January 18th, 2021, 08:10 PM

Hugo Holden replied to a thread MC1488 voltages in Vintage Computer Hardware

It is interesting the liberties some designers took with the power supply to the MC1488. In the Votrax TNT for example, they powered it from +12V and...

2 replies | 80 view(s)

January 18th, 2021, 04:30 AM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Thank you so much.

32 replies | 572 view(s)

January 17th, 2021, 07:43 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Hi Dave, Thank you. I sent a PM with my email on it. From what I can see so far it looks like it has a custom Character generator. Matrox did...

32 replies | 572 view(s)

January 17th, 2021, 05:04 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Also, I think the same adapter would be required to use something like the add on 8k RAM board (which I want to make a clone of too) so it will be...

32 replies | 572 view(s)

January 17th, 2021, 04:14 PM

Hugo Holden replied to a thread Fun with New AIM-65 in Vintage Computer Hardware

Yes that it true, especially since the computer won't boot if the RAM in page 0 or page 1 is defective. I think what happened was one or two of...

6 replies | 153 view(s)

January 17th, 2021, 01:36 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

Yes, thanks, a look at the photo again, it looks like an adapter sits between the AIM's expansion connector and the actual video card.

32 replies | 572 view(s)

January 17th, 2021, 01:24 PM

Hugo Holden replied to a thread Aim-65 video card mystery in Vintage Computer Hardware

The Hansotten site is where I found the photo of it plugged directly onto the expansion connector, the two versions of it explains that photo. ...

32 replies | 572 view(s)

January 17th, 2021, 03:38 AM

Hugo Holden started a thread Aim-65 video card mystery in Vintage Computer Hardware

I found this image in some vintage AIM 65 documentation. It is a video card that plugs directly onto the expansion connector. Does anybody know...

32 replies | 572 view(s)

January 16th, 2021, 07:03 PM

Hugo Holden started a thread Fun with New AIM-65 in Vintage Computer Hardware

My AIM-65 finally arrived. I was lucky to get one complete with the original Rockwell enclosure & power supply. (Photo attached of the unit with...

6 replies | 153 view(s)

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