If you buy an EPROM on eBay and it needs erasing, remove the label (you'll find letting the label soak in some lysol is the best way to do this) and then putting the EPROM with the window facing the sun for approx 30 mins should erase it. On a dull day it doesn't take longer, as UV goes right through clouds.
To combine the top OS ROM image I suggest you: (pseudo-code alert!) base = ALCHP(32768) copy the upper OS ROM image to base copy the TK2 ROM image to base+16384 save base TO base+32767 to a file that will be your new ROM image. Burn the image to the EPROM. If you have really amazing eyesight you can look in the window while it's burning and what all the bits turning off! [1] Cut yourself a 10x15mm bit of label, and write something descriptive on it, THEN stick it onto the EPROM window. ProTip: leave a bit of backing extra so you can separate it easily. Store programmed EPROMS in a bit of conductive foam or wrapped in aluminium foil when not in a PCB - they're quite hardy, but it only takes 25v on a pin to change a bit, and you walking around generates a lot more than that. Good luck! Dave [1] if you try this, you will go blind. Also, a blank EPROM is all 1's and burning it turns off the 0's you need to be zeros. Neat huh? On Sun, Feb 13, 2011 at 6:13 AM, Lee Privett <lee.priv...@gmail.com> wrote: > Looking on EBay the prices for the EPROM's are just a few pounds if > M27C512-15 is the same thing, the 28 pin DIL socket less than a pound, the > ROM codes Minerva & Toolkit II are freely available so other than getting > the code burnt on to the EPROM I have everything or am I missing something? > > Lee Privett > > ¦--------------------------------------------------------¦ ha > Sent from my Laptop running XP > but emulating the QL using QPC2 > ¦--------------------------------------------------------¦ > ----- Original Message ----- > From: Peter Graf > To: ql-us...@q-v-d.com > Sent: Sunday, February 13, 2011 12:16 AM > Subject: Re: [Ql-Users] Hardware question > > > Hi Lee, > > > So I need to look out for a Gc, SGC or Minerva conversion kit, > > haven't seen those on eBay or sell my retro > > For Minerva ROM you could try > > 1. Get an M27C512 and a 28 pin DIL socket (wide, long pins) > 2. Program lower 48 KB with Minerva, and upper 16 KB with extension ROM > binary of your choice > 3. Lift up pin 1, 20, 22. > 4. Press M27C512 into an IC socket > 5. Wire socket pin 20 to M27C512 pin 1 > 6. Wire socket pin 22 to M27C512 pin 20 > 7. Wire M27C512 pin 28 to M27C512 pin 22 > 8. Remove both QL ROMs from socket > 9. Press in the M27C512 with it's socket into one of the QL sockets > > All the best > Peter > > _______________________________________________ > QL-Users Mailing List > http://www.q-v-d.demon.co.uk/smsqe.htm > _______________________________________________ > QL-Users Mailing List > http://www.q-v-d.demon.co.uk/smsqe.htm > _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
