Re: [vcf-midatlantic] PDP-8/V project
That would take months to boot OS-8. Bill Dudley This email is free of malware because I run Linux. On Wed, Jun 7, 2023 at 5:38 PM Mike Rieker via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hi All, Some of you might have an interest in my PDP-8/V project. https://www.outerworldapps.com/pdp8v Not exactly vintage but definitely retro! Mike Rieker Beverly, MA
On Wed, Jun 07, 2023 at 05:54:00PM -0400, William Dudley via vcf-midatlantic wrote:
That would take months to boot OS-8.
Shouldn't be that slow. Pre 8/E minimum instruction time is 1.5 microseconds or 666 KHz. He is projecting around 10k CPS. Couldn't tell if cycle is instruction or internal clock. Booting OS/8 is more limited by speed of media than processor. For RK05 call it 2 seconds to boot. Simple scaling of 666/10 = 66.6 says 2 minutes to boot. Could be slower if multiple clocks per instruction or faster if mostly waiting for IO to complete. Speed will depend on how peripherals are simulated. PDP-8 could use databreak (DMA) or programmed IO based on device. Slower than a PDP-8/S at maximum of 37.6k instructions per second. People did use the 8/S though haven't found anybody fondly talking about that model.
On Wed, Jun 7, 2023 at 5:38 PM Mike Rieker via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hi All, Some of you might have an interest in my PDP-8/V project. https://www.outerworldapps.com/pdp8v Not exactly vintage but definitely retro! Mike Rieker Beverly, MA
On Wed, Jun 07, 2023 at 05:54:00PM -0400, William Dudley via vcf-midatlantic wrote:
That would take months to boot OS-8.
I have an FPGA implementation and if I run it at 5kcps it boots in a second or two. Takes minutes to do a DIR command though. It will run Focal decently. Instructions average 3 or 4 clocks per instruction, I'm limited by the RasPIs GPIO pin count so have a single 12-bit bi directional bus plus some control signals. Mike
Shouldn't be that slow. Pre 8/E minimum instruction time is 1.5 microseconds or 666 KHz. He is projecting around 10k CPS. Couldn't tell if cycle is instruction or internal clock.
Booting OS/8 is more limited by speed of media than processor. For RK05 call it 2 seconds to boot. Simple scaling of 666/10 = 66.6 says 2 minutes to boot. Could be slower if multiple clocks per instruction or faster if mostly waiting for IO to complete. Speed will depend on how peripherals are simulated. PDP-8 could use databreak (DMA) or programmed IO based on device.
Slower than a PDP-8/S at maximum of 37.6k instructions per second. People did use the 8/S though haven't found anybody fondly talking about that model.
On Wed, Jun 7, 2023 at 5:38â¯PM Mike Rieker via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hi All, Some of you might have an interest in my PDP-8/V project. https://www.outerworldapps.com/pdp8v Not exactly vintage but definitely retro! Mike Rieker Beverly, MA
Hi All, Y'all might be interested, I actually got the PDP-8/V finished! It runs OS/8 (at a little over 13 kcps). Only 1.72kW so doesn't need a twist-lock ;( https://www.outerworldapps.com/pdp8v/#upd1112 I have a friend with an ASR33 so will hook that up next, and I have to figure out how to make some kind of box for it. Mike
Hi All, Some of you might have an interest in my PDP-8/V project. https://www.outerworldapps.com/pdp8v Not exactly vintage but definitely retro! Mike Rieker Beverly, MA
Wow! That is masochism at its finest! Well done! 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos -----Original Message----- From: wmrieker@nii.net <wmrieker@nii.net> Sent: Tuesday, November 14, 2023 4:55 PM To: vcf-midatlantic@lists.vcfed.org Subject: PDP-8/V project Hi All, Y'all might be interested, I actually got the PDP-8/V finished! It runs OS/8 (at a little over 13 kcps). Only 1.72kW so doesn't need a twist-lock ;( https://www.outerworldapps.com/pdp8v/#upd1112 I have a friend with an ASR33 so will hook that up next, and I have to figure out how to make some kind of box for it. Mike
Hi All, Some of you might have an interest in my PDP-8/V project. https://www.outerworldapps.com/pdp8v Not exactly vintage but definitely retro! Mike Rieker Beverly, MA
participants (4)
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David Gesswein -
W2HX -
William Dudley -
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