- Pulsar 7500 Computer
- Pulsar 7500 Initial Power Up and Fault Finding
- Pulsar 7500 Floppy Disk Drive
- Pulsar 7500 SASI/SCSI
- Using HD 5.25″ FDDs as 8″ Drive Substitutes
This computer is not what it seems.
Inside the IBM PC style enclosure are 5 little big boards – one of which acts as a master to control drives and printers. The monitor is an IBM terminal, which is much younger than the computer.
The other four little big boards support 4 users via serial terminals. Each of these is connected back to the master via a serial line. These cards all run Turbodos. Each provides 64kB of memory for running CP/M programs.
The master provides access to a floppy disk drive and a SCSI hard disk – emulated with a SCSI2SD.
The construction is a bit rough and ready!
Wow! I also have 5 LBBs and a couple of cages. I also have the recently imaged TurboDOS along with schematics for all of the peripheral cards e.g. SASI. The schematics show jumpering for slave configs, erc, however they are not that clear. Would love to swap notes at some point, any chance of photos of all 5 boards?
It’s great to find another Pulsar user. I’m just punching in a bunch of stuff on the 9000 and then i’ll start on the 7000. I’ll drop you a mail tomorrow. There is a lot of Pulsar stuff in the Microbee Technology repository.