Search Posts:

IMSAI PCS-80/30 with Persci 277 Drive

SHARE

Return to Threads
  IMSAI PCS-80/30 with Persci 277 Drive by Bill Degnan - 02/05/2020 22:35
IMSAI PCS-80/30
This system came into Kenett Classic for repairs. The customer described how the disk does not boot. Click image for larger view.


IMSAI PCS-80/30
Here is a photo of the Persci 277 dual disk drive with the cover removed. Click image for larger view.


IMSAI PCS-80/30
The system came with a Processor Technologies Sol System Video Monitor, something I had not seen before. Click image for larger view.


Next - Determine if the ROM is configured for Tarbell disk controller, it looks like the ROM was recently replaced. Could be that the ROM's B command is not finding the drive through the controller. The voltages on the disk controller are on the surface ok.

A lot more to come.

Reply
  Testing Perscii 277 by Bill Degnan - 03/18/2020 12:49
I attached the Persci 277 to a known-working Cromemco System 1 with 16FDC drive controller. The drive did not respond, but I did not confirm for sure I had everything correct to cause the system to look to the drive to boot it.

I referred the customer to someone who has an IMSAI turnkey system. Assuming I am correct that the replacement ROM (V 1.1) is not compatible with the Tarbell controller attached to a Persci 277 drive the next step is to find a controller and drive that is compatible with the turnkey system running ROM 1.1.

I could have but did not have the time to attach the Persci 277 drive to my Cromemco System 3, which already has Persci drives (299's) to see if the 277 works, but I gave this system back to the customer.

Reply

Resources:

  • Home
  • Manufacturer photos, software, docs
  • Disk Images
  • Computer History Articles Scans and Files
  • YouTube.com Videos
  • Sale/Trade/Wanted/Miscellaneous
  • Photo Gallery
  • The Ultimate Vinage Computing Links List
  • Switch to DOS Prompt view

    • Buy a Commodore Computer Poster

    Popular Topics and FAQs


  • TM990/101 M
  • Altair 8800bt notes
  • TRS 80 Model 4 Engineering Sample
  • Altos 5-5AD
  • Morrow Wunderbuss Motherboard - Fried!
  • Epson PX-8
  • C64 emulator to run on PC
  • Mac 128K with SAD MAC error 041800
  • IMSAI 8080 With Processor Tech. Cutter
  • Secrecy is the keystone of all tyranny
  • Cromemco System Three
  • Commodore "Coherent"
  • Exatron Stringy Floppy Update
  • TM 990/189 or PP189
  • Lanier Word Processor Model 103
  • Univac 1219 rescue
  • IMSAI 1.4 BASIC vs. MITS 8K BASIC
  • Atari 520ST
  • DEC Information Request Reply Card
  • Amiga 2500 Restoration
  • IBM XT sn 4359455
  • Amiga 2000 with Dual Drives and HD
  • A New 68000 CPU S-100 Board
  • Edmund Scientific Co Ad 1973
  • Micropolis 10xx Drive Inventory
  • Texas Instruments 99/4a with PHP1200
  • MITS Altair 8800b T with Dual Drives
  • Burroughs L5000 Controller Card Photos
  • Digital PDP 11/44
  • TRS 80 Model III Exatron Stringy Floppy
  • Digital PDP-9 The Serious Computer
  • Live long and prosper, Spock
  • PDP 11/40 M7656 Serial Comms
  • 1993 Compaq Deskpro 5/60M
  • 1974/5 TCC-3700 i8080 Computer
  • Processor Tech 3P + S ASR 33 Jumpers
  • Tektronix 4015-1 Graphics Terminal
  • Lear Siegler ADM-3A GraFix Board
  • UNIVAC 1219 USS Midway CV-41
  • Commodore VIC-21
  • Prevent VMS MULTINET SMTP Relay Hijacks
  • NExT Cube Restoration
  • 1976 P.C.C. Features the MAI JOLT 6502
  • 1961 Beckman DEXTIR Computer
  • UNIVAC 1 and UNIVAC File Computer 1
  • Computer Music Using the IBM 7094
  • 1985 PCs Limited Turbo PC
  • Digital Equipment Corporation PDP-8
  • IMSAI 8080 Chase the Lights Variations
  • XYBASIC on the IMSAI 8080
  • Cromemco Dazzler
  • Cramer Intel 8080A Microcomputer
  • Original ACHTUNG Computer Lab Humor
  • Leading Edge Computers

    • Past Issues:

    Before we switched over to a blog format, past page archives here:
  • Vintage Computer Festival East 3.0 June 2006
  • Commodore B Series Prototypes July 2006
  • VOLSCAN - The first desktop computer with a GUI? Oct 2006
  • ROBOTS! - Will Robots Take Over? Nov 2006
  • Magnavox Mystery - a Computer, or? Jan 2007
  • The 1973 Williams Paddle Ball Arcade Computer Game Feb 2007
  • The Sperry UNIVAC 1219 Military Computer May 2007
  • VCF East 2007 - PET 30th Anniversary June/July 2007
  • The Electronic Brain August 2007
  • Community Memory and The People's Computer Company October 2007
  • Charles Babbage's Calculating Machine December 2007
  • Vintage Computing - A 1983 Perspective February 2008
  • Laptops and Portables May 2008
  • From Giant Brains to Hobby Computers - 1957 to 1977 August 2008
  • Historic Computer Magazines November 2008
  • World's Smallest Electronic Brain - Simon (1950) December 2008 - Feb 2009
  • Free Program Listings Spring 2009
  • Computer Music Summer 2009
  • Popular Electronics Jan/Feb 1975 - Altair 8800 Fall 2009
  • Early Microcomputer Mass Storage Summer 2010

    • Lanier Model 103 frontleft

    This image was selected at random from the archive. Click image for more photos and files from this set.