You can play Quake 1 using the DOSBox emulator (it's compatible). That's probably the closest you will come to the original experience, compared to the source ports.

DOSBox emulation usually works really well, particularly for the more popular titles, which get a lot of testing. And any even remotely modern PC should have the performance to emulate it easily. You'll probably even be able to do multiplayer (DOSBox has IPX/SPX emulation).

Full Tutorial (with possibly all equipment/weapons): http://www.hattongames.com/2012/06/how-to-create-custom-buy-binds-for-csgo/

Quick Tutorial: I haven't checked to see if it works, but as Decency said in his post simply make a buy script. What this does is allow you to bind keys to buying weapons.

Find default.cfg in Steam\steamapps\common\Counter-Strike Global Offensive\csgo\cfg and open it in your text editor.

Next add in the script with the things you'd want to buy to the bottom of the existing script. Taking the script pointed out above, you could say:

//Print to console
echo "Press F1 for AK-47 / M4A1"

//Set items you want to buy, seperated by semicolon
//alias sets the following word to a variable to be later used
alias "buy_ak-m4" "buy ak47; buy m4a1"

//Then you bind it to a key using the alias!
bind "F1" "buy_ak-m4"

What I also noticed is that there is an autobuy.txt script already in csgo, under folder Steam\steamapps\common\Counter-Strike Global Offensive\csgo. You can type autobuy into the console, or press F3, and it will work. You could try modifying that script to fit your needs.

autobuy.txt also contains a list of most weapon aliases you can use in the buy-binding script.