STE 32MHz PLUG IN BOOSTER (again) 2021 variation
Posted: 11 Jan 2021 19:53
OK, So I couldn't leave this alone.. So after the bit of a epic load of drama over on the previous design https://www.exxosforum.co.uk/forum/viewt ... 1018#p7645 I designed this variation...
This is still a plug-in board. It plugs "inside" the 68K CPU socket as not to damage the socket. I have some dummy squares but may need tweaking to fit.
This one has SMT bus pullups (no need to solder them anymore! yay!) , so no need to change them on the motherboard either. They have always been on the V1 series, but in SIP format. Now I can get stuff assembled (at least in part) I went with SMT resistors packs.
The whole thing pretty much got re-designed. Mostly it worked fine anyway, but internal and external blitter machines were causing huge headaches and needed different fixes depending on what machine they were fitted in. Which ultimately lead to the project being abandoned. This time it has a schmitt buffer and a lot of small tweaks on the PCB and firmware. So I *hope* this will actually fix those issues..
I will be looking for a couple of testers in the near future. You must be good at soldering to take this kit on! You will get a small kit for the sum of £35 + postage for BETA testers. You will have to solder the socket and header pins & GAL etc..You will need a STE DUALTOS board (more recent variation the better). You need a machine with a internal and external blitter to test this on. Let me know in this thread if interested!
This is still a plug-in board. It plugs "inside" the 68K CPU socket as not to damage the socket. I have some dummy squares but may need tweaking to fit.
This one has SMT bus pullups (no need to solder them anymore! yay!) , so no need to change them on the motherboard either. They have always been on the V1 series, but in SIP format. Now I can get stuff assembled (at least in part) I went with SMT resistors packs.
The whole thing pretty much got re-designed. Mostly it worked fine anyway, but internal and external blitter machines were causing huge headaches and needed different fixes depending on what machine they were fitted in. Which ultimately lead to the project being abandoned. This time it has a schmitt buffer and a lot of small tweaks on the PCB and firmware. So I *hope* this will actually fix those issues..
I will be looking for a couple of testers in the near future. You must be good at soldering to take this kit on! You will get a small kit for the sum of £35 + postage for BETA testers. You will have to solder the socket and header pins & GAL etc..You will need a STE DUALTOS board (more recent variation the better). You need a machine with a internal and external blitter to test this on. Let me know in this thread if interested!