[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Bob Rosenbloom via cctalk
I can't add attachments here. I emailed them to your direct email address. Bob On 11/17/2023 3:11 AM, Rod Smallwood via cctalk wrote: Hi Bob     The attachment seems to be missing. Rod Also I hae some more boards available M7856     X 2 M863     X 2 M837    X 2 M8650 M8320 M880 + H241 (MR8

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Chris Zach via cctalk
Try printing them in PETG: I've printed several of them for my 8/L and they equal the strength of factory switches. Even the little pins are more than strong enough. PETG does require a higher printing temperature (220c-230c) but is well worth it and a massive improvement over PLA. Chris

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Mike Katz via cctalk
I have tired to print the paddle handles both SLA and FDM and none match the quality and strength of injected molded paddles. Unless you print an entire set (light and dark colors) it is nearly impossible to match the colors also.  Even if you were to find the perfect filament or resin color,

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Rod Smallwood via cctalk
Hi Bob     The attachment seems to be missing. Rod Also I hae some more boards available M7856     X 2 M863     X 2 M837    X 2 M8650 M8320 M880 + H241 (MR8 EC) M849 M3310 On 16/11/2023 20:53, Bob Rosenbloom via cctalk wrote: Do you have any more of the DEC PDP-8 e/m/f front panels? I'm

[cctalk] Re: Address wrapping in PDP-11 MMU

2023-11-17 Thread Martin Bishop via cctalk
OK, a faux descriptor would work round the documented checks which are on block number rather than EA - there is a hardware overide I'm delighted to hear that RSTS won't play along and set up for EA overflow Martin -Original Message- From: Paul Koning [mailto:paulkon...@comcast.net]

[cctalk] Re: Address wrapping in PDP-11 MMU

2023-11-17 Thread Paul Koning via cctalk
Ok, but I think that's not what I meant. Suppose I have APR6 = 17 and length > 1. That means VA 140076 maps to physical address 1776, and VA 140100 maps to physical addres 2000 which when masked with 22 bits would end up at 0. The offset within the page is <= the page length.

[cctalk] Re: Address wrapping in PDP-11 MMU

2023-11-17 Thread Martin Bishop via cctalk
EK-DCJ11-UG-Pre DCJ11 Microprocessor User's Guide says it will abort [the first processor guide on the shelf] $4.5.2.2 (p4-7) Page Length Field ... "The block number of the virtual address is compared against the page length field to detect length errors" ... $4.7.1 MMR0 <14> Abort Page Length

[cctalk] Address wrapping in PDP-11 MMU

2023-11-17 Thread Paul Koning via cctalk
I'm working on some code where it would be handy to map the top of the I/O page along with the bottom of physical memory. An obvious hack is to point the APR to the I/O page address needed, then set the length so that the address modulo 2^22 also covers the low memory range. It seems from the

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Bob Rosenbloom via cctalk
On 11/16/2023 12:53 PM, Bob Rosenbloom via cctalk wrote: Do you have any more of the DEC PDP-8 e/m/f front panels? I'm looking for one that matches the layout attached. I don't care what model (e/m/f etc.) it's for, but the rotary switch layout needs to be right and I prefer the matte finish.

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Tom Hunter via cctalk
I had some toggles printed for me professionally, but they are inferior to the originals and the colours don't match. If anyone has spare DEC LAB-8/e switches please let me know. Thanks Tom On Fri, Nov 17, 2023, 10:14 PM Bill Gunshannon via cctalk < cctalk@classiccmp.org> wrote: > > > On

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Bill Gunshannon via cctalk
On 11/17/2023 8:52 AM, Tom Hunter via cctalk wrote: Hi Bob, I can't help with your search for 8/e front panels, but you mentioned "green switch boards". I have a nicely restored DEC LAB-8/e with green switch toggles. Do you have spare green switch toggles? I would love to have one dark green

[cctalk] Re: PDP-8/E front panels

2023-11-17 Thread Tom Hunter via cctalk
Hi Bob, I can't help with your search for 8/e front panels, but you mentioned "green switch boards". I have a nicely restored DEC LAB-8/e with green switch toggles. Do you have spare green switch toggles? I would love to have one dark green and one light green toggle. I don't need the actual

[cctalk] Re: Free to good home HP 7510a Photo Plotter - UK

2023-11-17 Thread Andrew Back via cctalk
Hi Dave, Did this go? If not, I'd be interested. I'm located in Hebden Bridge, so could drive over to collect. Best, Andrew On 16/11/2023 10:24, Dave Wade G4UGM via cctalk wrote: > Folks, > > > > Trying to reduce the weight in my loft and I would like to donate my HP > Photoplotter to a good