View Profile: bladamson - Vintage Computer Forum

March 6th, 2021, 05:25 PM

bladamson replied to a thread Video output over parallel port? in Vintage Computer Hardware

My main reason for wanting to use the Pi is the plethora of old computer emulators that will run on it with very little effort. But yeah, I agree. ...

15 replies | 235 view(s)

March 6th, 2021, 05:13 PM

bladamson replied to a thread Video output over parallel port? in Vintage Computer Hardware

Shoot, I was hoping that was exactly what the 8237 could do. IIRC there's a mode of the Z8410 DMA controller where you can program it to repeatedly...

15 replies | 235 view(s)

March 6th, 2021, 08:59 AM

bladamson replied to a thread Tandy16 port MUX (multiplexor) unit in Tandy/Radio Shack

In muxing all that to two serial ports, would it have been limited to 19.2k (2x9600)? I am trying to remember what I was reading about the z80...

21 replies | 1757 view(s)

March 6th, 2021, 08:36 AM

bladamson replied to a thread Video output over parallel port? in Vintage Computer Hardware

I have a very very still-buggy prototype of a contraption that works similarly, but it talks to the Pi through an 8255 PPI chip on an ISA card, which...

15 replies | 235 view(s)

March 6th, 2021, 08:14 AM

bladamson replied to a thread V30 not recognized in PS/2 Model 25 in PCs and Clones

My guess is too that you have a fake. The v30 in my M25-XT is detected as a v30 by checkit, and the benchmarks reflect the slightly increased...

8 replies | 187 view(s)

March 2nd, 2021, 03:50 PM

bladamson replied to a thread Can you identify this card I found in an Apple IIe ? in Early Apple (I, ][, ///, etc.)

I was thinking that too, but it seems like it would be insane to try to power an MFM bubble off the appleII bus power.

11 replies | 314 view(s)

February 27th, 2021, 08:08 AM

bladamson replied to a thread Model M With Overly Sensitive Keys? in PCs and Clones

They both came from the same university auction in the early 2000s, and appeared pretty heavily used even then. Both blue-logo Lexmark models with...

28 replies | 497 view(s)

February 27th, 2021, 08:04 AM

bladamson replied to a thread Model M With Overly Sensitive Keys? in PCs and Clones

Well shoot. Do you think you could drill the heads off the plastic rivets, then carefully drill pilot holes in the stubs and reassemble with...

28 replies | 497 view(s)

February 26th, 2021, 03:39 PM

bladamson replied to a thread Model M With Overly Sensitive Keys? in PCs and Clones

IIRC the buckling spring model Ms have a rubber membrane too, but it's not quite the same as the rubber dome keyboards. There's a pivot plate that...

28 replies | 497 view(s)

February 26th, 2021, 03:22 PM

bladamson replied to a thread Model 3 video output. in Tandy/Radio Shack

Here's the one I was thinking of. He has someone testing it in a Model 3 right now, but it isn't quite ready yet. ...

10 replies | 254 view(s)

February 26th, 2021, 02:56 PM

bladamson replied to a thread Model 3 video output. in Tandy/Radio Shack

I don't think the frequencies are compatible with NTSC. There's a guy on one of the TRS-80 discords who made a contraption that replaces the CRT...

10 replies | 254 view(s)

February 25th, 2021, 06:30 PM

bladamson started a thread "New" oscilloscope. Very exciting. in Vintage Computer Tools

Tektronix 11401 mainframe DSO scope. A beautiful ol' 70lb 4U rackmount boat anchor, mid '80s vintage. Has a '286+'287 inside, I think. The...

7 replies | 195 view(s)

February 23rd, 2021, 06:40 PM

bladamson replied to a thread Early ISA BNC Networking? in Vintage Computer Hardware

Sorry, heh. It's been many years since I dealt with 10base-2. ;P

11 replies | 243 view(s)

February 23rd, 2021, 03:06 PM

bladamson replied to a thread Proper Linux for Compaq Proliant 2500 in Pentium (First generation)

The most important question though is.......... Will it run Dwarf Fortress? :3

9 replies | 334 view(s)

February 23rd, 2021, 03:03 PM

bladamson replied to a thread JB PlasticWeld case repair on 1000HX in Tandy/Radio Shack

I've done that on some smooth plastic parts, but those EX/HX'en have a textured finish that doesn't take kindly to sanding. :(

7 replies | 257 view(s)

February 23rd, 2021, 02:55 PM

bladamson replied to a thread Early ISA BNC Networking? in Vintage Computer Hardware

A machine that late should have 16 bit ISA slots, which makes things a lot easier. Most any cheap/ubiquitous 3c509 or NE2000 card ought to have a...

11 replies | 243 view(s)

February 23rd, 2021, 08:56 AM

bladamson replied to a thread PS/2 Model 25 Wooden case in PCs and Clones

Nice. But I do have an extra lower sheet metal doohickey that you can have if you want it (although it is missing the ratcheting foot and part of...

3 replies | 191 view(s)

February 21st, 2021, 07:40 AM

bladamson replied to a thread Proper Linux for Compaq Proliant 2500 in Pentium (First generation)

I like Slackware on old boxen, but whether or not the most recent releases will run on a 686 machine entirely depends on how much RAM you can stuff...

9 replies | 334 view(s)

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