ROM-el should work. -- RETRO Innovations, Contemporary Gear for Classic Systems www.go4retro.com store.go4retro.com On Mar 8, 2025 at 1:15 PM -0600, Mike Katz via cctalk <cctalk@classiccmp.org>, wrote:
> The HP Portable Plus computer ROM Drawer uses 28 pin 1MBit (128K) Mask > ROMs (TC531000) or 512KBit EPROMs (27C512). > > A few years ago a company called Personalized Software made something > called a ROMBO. This was an adapter that allowed the use of a 32 Pin > 27C010 Quad Pack and plugged into the 28 pin socket on the ROM Drawer. > The down side of this was that the ROMBO needed a special EPROM > programmer to program. Here is a link to a picture of the ROMBO. These > are no longer available. > > https://drive.google.com/file/d/1VKaWpfTIgDriStECXqfptBjHoL6wEmN6/view?usp=sharing > > I am thinking of doing something like the schematic linked below to use > a modern flash chip (AT28C010) in place of the 27010 and bring out the > three pins necessary for programming to jumpers that can be connected to > a flash programmer (or I might make an adapter board that the board > plugs into for programming). > > https://drive.google.com/file/d/18RsZPBJldTyxzjozVlO9okfpgOK7P2QT/view?usp=sharing > > Has anyone made anything like this for the portable plus or seen > something similar. > > I also have the following questions: > > 1. Is there enough room in the ROM Drawer for some kind of socket on > the adapter board? > 2. Where can I find the low profile pins used in the ROMBO? > 3. Have I missed anything? > > Thank you... > >
