Ruud Broers Phantom Clock for 24 Pin BIOS chips

This was originally designed for a TRS-80 Model II but can be used in any vintage company with a 24 pin(2716/2732) ROM/EPROM as part of its BIOS.

The board creates the possibility to combine a DS1215 or DS1315 with the existing boot ROMs for many computers.

The DS1215 is the chip that is used in the DS1216 SmartWatch DIP sockets. The DS1315 is the successor with the same functionality. Either chip can be used. For the DS1315 use the 5 Volt version DS1315-5+ or DS1315N-5+. The reference of DS1315 includes DS1215. 

Known systems it should be usable in at the current time -

TRS-80 Model II - Originally designed for

TRS-80 Model I - (Z34, unverified as to fit)

TRS-80 Model III - (Z106, but will require modifying the tower the MB connects to)

TRS-80 Model 4 Non Gate Array- (U4, unverified as to fit)

Machines NOT compatible with 

TRS-80 Model 4 - Lack OE* signal

TRS-80 Model 4P - Used 4K 2532 incompatible with 2732

Versions we sell -

1) Bare board - Just the bare board. We include a BOM and instructions

2) Kit without EPROM - All the items to build your own, except a ROM/EPROM that the clock is replacing

3) Kit with programmed EPROM - Same as number 2, but also includes a 2716 that you can send us your image and we'll burn for you

4) Fully Assembled without ROM/EPROM - Just add your ROM/EPROM and battery and you're ready to go

5) Fully Assembled with EPROM - Send us your image and we'll burn and assemble your unit. Add a battery and you're ready to go!