Can all registered uses please login, even just for a few minutes..
It helps build a picture where our "good traffic" is coming from..
Thanks :)

DFB1X any use for a expansion port ?

Discussion and support for the DSTB1 & DFB1 boosters by BadWolf..
User avatar
Badwolf
Site sponsor
Site sponsor
Posts: 3108
Joined: Tue Nov 19, 2019 12:09 pm

Re: DFB1X any use for a expansion port ?

Post by Badwolf »

exxos wrote: Fri Sep 25, 2026 11:58 am So basically this design has a clone of the Falcon RAM expansion port built on. As said before it had to go "above" the existing connectors. And then the third small connector on the bottom left holes the rest of the address and data bus bits. I also routed the CPUCLK to pin 24 of the "extra" IO connector.
Cool. Any spare pins on the bottom one in the end? I'm thinking about STERM in particular.

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
User avatar
exxos
Site Admin
Site Admin
Posts: 29163
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: DFB1X any use for a expansion port ?

Post by exxos »

Badwolf wrote: Fri Sep 25, 2026 1:44 pm Cool. Any spare pins on the bottom one in the end? I'm thinking about STERM in particular.
Ah yes very good point that.

There are some "random" free pins. mostly routed to GND.

Capture.PNG
Capture.PNG (734.1 KiB) Viewed 17 times

The middle connector is the original Falcon connector.. The one above it is the through expansion port. And the bottom one holds the extra address and data lines.. The likely STERM needs to get added to that.. *somehow* :)
User avatar
Badwolf
Site sponsor
Site sponsor
Posts: 3108
Joined: Tue Nov 19, 2019 12:09 pm

Re: DFB1X any use for a expansion port ?

Post by Badwolf »

exxos wrote: Fri Sep 25, 2026 1:51 pm The middle connector is the original Falcon connector.. The one above it is the through expansion port. And the bottom one holds the extra address and data lines.. The likely STERM needs to get added to that.. *somehow* :)
TBH, thinking about it, direct DTACK[0|1] access is probably the better choices than STERM as, whilst slower, does allow different bus sizing.

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
User avatar
exxos
Site Admin
Site Admin
Posts: 29163
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: DFB1X any use for a expansion port ?

Post by exxos »

Badwolf wrote: Fri Sep 25, 2026 1:55 pm TBH, thinking about it, direct DTACK[0|1] access is probably the better choices than STERM as, whilst slower, does allow different bus sizing.
All 3 it is then :P

Don't think up any more because we are fast running out of pins :lol:
Post Reply

Return to “DSTB1 & DFB1 booster by BadWolf”