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xl1201

A 21-post collection

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Symbolics XL LAN Challenges

I recently set up a LAN of my three XL Symbolics machines at home. The XL1201 which was having stability issues has been largely stabilized (thanks »

Douglas Fields Douglas Fields on xl1201, screenshot, genera, symbolics, crash 05 May 2021

Ivory CPU Heatsink and Instability

One of the theories about the instability of my Symbolics XL1200 is that the CPU has no heatsink and so it is suffering from thermal problems »

Douglas Fields Douglas Fields on symbolics, xl1201, repair, heatsink 06 August 2016

XL1201 Moment of Truth

UPDATE: No joy. Still self-reboots. So, I put the Merlin II card back into the XL1201, connected the power and console, and powered it up. Nothing. »

Douglas Fields Douglas Fields on xl1201, symbolics, repair 24 July 2016

XL1201 Merlin II Chip Reseating

UPDATE: I clipped and removed the broken capacitor. Replacing it will be the task of another day. I spent two days removing, cleaning and reseating each »

Douglas Fields Douglas Fields on symbolics, xl1201, pcb, repair 24 July 2016

Detailed Inspection of XL1201 Merlin II Solder Side

To see if I can isolate the cause of the XL1201 instability, I am going to physically inspect the two main cards with a loupe and »

Douglas Fields Douglas Fields on symbolics, xl1201, pcb 23 July 2016

XL1201 Stability Update

In an effort to rule out the power supply causing the XL1201's instability, I sent it out for overhaul by Power Clinic. After reinstalling it, I »

Douglas Fields Douglas Fields on symbolics, xl1201, power 16 July 2016

Todd MAX-354-1252 Power Supply for XL1201

So, I learned something about the Todd MAX-354-1252 power supply in the Symbolics XL1201 today that I thought I'd share. Not that I understand it, mind »

Douglas Fields Douglas Fields on symbolics, xl1201, power 13 July 2016

More XL1201 Crashes

Well, tonight I had more crashes using the XL1201. Each time the computer crashed after about 20 minutes. This indicates to me that there's something odd »

Douglas Fields Douglas Fields on symbolics, xl1201, crash 07 July 2016

XL1201 Instability Next Steps

Well, the instability on the XL1201 has been disheartening. However, I have a few suggestions and plans to see if I can figure it out. Kalman »

Douglas Fields Douglas Fields on symbolics, xl1201, status 06 July 2016

Power Supply, Memory, Crashes

I don't have the time to post all the details before going to sleep, but I did a few things tonight including measure the power supply »

Douglas Fields Douglas Fields on symbolics, xl1201, power, memory, problems 05 July 2016

Clean Genera 8.3 FEPfs

I was asked to provide a full list of all the files on the XL1201 Genera 8.3 hard drive I received from David K. Schmidt. »

Douglas Fields Douglas Fields on xl1201, genera, screenshot, fepfs 27 June 2016

Setting Up Genera 8.3, Part 1

I'm setting up Genera 8.3 on the XL1201 using a clean hard drive. Literally all this hard drive has on it is Genera 8.3 »

Douglas Fields Douglas Fields on symbolics, genera, xl1201, nfs, screenshot 27 June 2016

XL1201 Power Consumption

I was asked how much power is used by the XL1201. Here are a few data points... XL1201 with only SCSI2SD: 222-233W Console: 106W With the »

Douglas Fields Douglas Fields on xl1201, symbolics, power, cost, console 26 June 2016

XL1201 and SCSI2SD v5 128GB

I'm attempting to use the SCSI2SD v5 with a 128G microSD card. You can find out the size of an SD card attached to a modern »

Douglas Fields Douglas Fields on xl1201, scsi, genera, scsi2sd, cdrom 26 June 2016

SCSI 50 to 68-pin Adapters

Well, it seems that not all SCSI 50-pin female to 68 pin female adapters are created equally. I bought several of these from Amazon, made by »

Douglas Fields Douglas Fields on scsi, xl1201 26 June 2016

XL1201 Mini-benchmark

UPDATED July 28, 2016: More mini-benchmark results added. I was asked to do a simple benchmark of the XL1201 by Jerome Ibanes and share the results. »

Douglas Fields Douglas Fields on xl1201, genera, benchmark, lisp 25 June 2016

XL1201 Known Working Disks

Note: After formatting a disk to 1280-byte blocks on Genera, make sure to hard power cycle reboot the computer before trying to use it for a »

Douglas Fields Douglas Fields on xl1201, scsi 24 June 2016

Large SCSI Disks and XL1201

TL;DR: SCSI disks with 20M 1280-byte blocks work SCSI disks with 25M 1280-byte blocks work SCSI disks with 28M 1280-byte blocks work SCSI disks with »

Douglas Fields Douglas Fields on scsi, xl1201, fep, fepfs 24 June 2016

Clean Boot of Genera 8.3

The XL1201 now boots nicely from a new ST318451LW Cheetah drive that David K. Schmidt sent (sold) me. It loads FEP version 333 and a clean »

Douglas Fields Douglas Fields on genera, xl1201, screenshot 24 June 2016

Broken SCSI Pin on XL1201

Well, I was installing a new hard drive into the XL1201 today and just before I connected the SCSI cable, I noticed a pin seemed to »

Douglas Fields Douglas Fields on xl1201, scsi, repair, pcb 24 June 2016
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