Sharp PC-1500 Cartridge for debugging

For debugging purposes (and also for playing around with memory chips on a bread board) I’ve created little breakout boards for the cartridge slot on the bottom of Sharp PC-1500s/1600s.

Sharp Debug Cartridge PCBSharp Debug Cartridge insertedI’ve added a layer of foam (not visible on the photo) on the bottom side of the cartridge to prevent the pin ends from scratching on the case.

Typing on the PC while having cables connected to the cartridge is a bit annoying as I tend to pull off the cables when turning the PC around. I’m currently figuring out a better solution by using ribbon cables instead of the pins. I will update the post as soon I’ve managed to make photos of the modified version.


Sharp PC-1500 Interface Card / Breakout Board

Just a little update for all readers interested in Sharp 1500/1600 PCs: for hacking around with the Sharp Pocket Computers I’m using a self-made breakout board that allows easy access to all 60 pins of the interface connector.

Sharp PC-1500 Breakout Board (1)The 60-pin connector is a simple 1.27*2.54 60-pin male header (I’ve bought mine here).

Two LEDs indicate battery or power connection, and on/off state. (In most cases power lights up as soon as the board is attached to a Sharp PC.)

Sharp PC-1500 Breakout Board (2) Sharp PC-1500 Breakout Board PCBs

Suitable paper rolls for the Sharp CE-150 printer

It’s not that easy as it may sound to find paper rolls for a 30 years old printer, the Sharp CE-150. The printer is used in combination with a Sharp PC-1500/1500A pocket computer.

I’ve looked at my small amount of paper rolls, the leftovers I’ve found in a box on the attic. Interestingly they were differing in size (can’t remember why):

Sharp CE-150 Paper Rolls

(Left to Right) Core Diameter Tube Diameter Outer Diameter Width
Roll 1 7.7 mm 14.7 mm 28.5 mm 57.4 mm
Roll 2 8.3 mm 13.0 mm 29.3 mm 57.6 mm
Roll 3 11.1 mm 17.0 mm 33.0 mm 58.7 mm
Roll 4 9.7 mm - 19.7 mm 58.3

Their width and outer diameters did not differ significantly, but the core diameters did. Paper rolls with core diameters of 7-9 mm are hard to get, the rolls sold today mostly have a diameter of 12 mm. I’ve successfully tested thermal (yes: thermal) paper rolls with this diameter in the CE-150, and these are really cheap to get (e.g. on eBay Germany). The ink doesn’t run, but there might be paper rolls with different coatings. I did not check that.

Maybe as a warning: Thermal papers mostly contain Bisphenol A (BPA), a substance that exhibits hormone-like properties!

The approximate dimensions you should look for are:
Width: 57 mm; Inner / outer diameter: 12 / 30 mm; Length: 10 m

Sharp CE-150 Still available paper roll (dimension)