H4G - Mongrel SMT Edition

[Icky]

- Video and Audio Section

Next on the list is the Composite GEN, Mono GEN and Audio GEN areas. All the components have been changed to SMT and will tidy them up a little later. As there is more room now to move the Mono GEN components away from the PSU bracket slot.

Before:

Screenshot 2020-05-20 at 19.42.03.png (397.32 KiB) Viewed 8952 times

After SMT treatment:

Screenshot 2020-05-20 at 19.42.34.png (263.15 KiB) Viewed 8952 times

[Icky]

- RAM SIMM Section

Conversion of the resistors around the RAM (MAD) lines have been converted over to SMT. In addition we have added a MAD10 line out of the SIMM for future use.

Before:

Screenshot 2020-05-21 at 08.35.09.png (306.44 KiB) Viewed 8938 times

SMT Treatment:

Screenshot 2020-05-21 at 08.30.29.png (358.62 KiB) Viewed 8938 times

[chue]

Next on the list is the Composite GEN, Mono GEN and Audio GEN areas. All the components have been changed to SMT and will tidy them up a little later.

For people like me who can’t solder, can you add a little spacing between the components?

As it currently is, I think I’d have a hard time with the smt parts so close to each other. I’d get one part on only to lift it off the pad with the iron, while trying to solder on another part.

Maybe not even a problem if the pcbs come with the parts already soldered on.

I understand you will tidy up later - I’m just trying to get feedback to you prior.

[Icky]

For people like me who can’t solder, can you add a little spacing between the components?

As it currently is, I think I’d have a hard time with the smt parts so close to each other. I’d get one part on only to lift it off the pad with the iron, while trying to solder on another part.

Maybe not even a problem if the pcbs come with the parts already soldered on.

I understand you will tidy up later - I’m just trying to get feedback to you prior.

Hi. Feedback is always welcome

Yes they are a bit close together and need a tidy up but these are the components we are looking to have the pcb fab place on the boards.

[PaulJ]

@Icky to have the floppy HD selection work with a gotek it needs a jumper from floppy pin 32 to the drive 0 main board jumper. Is there any chance to get this put in as a lan since this floppy connector pin has no existing connection?

[weav]

Sign me up for one. Need a new project! Thanks for all you guys do!!

[Icky]

Sign me up for one. Need a new project! Thanks for all you guys do!!

@weav - if you want to sign up for one the interest thread is here - https://www.exxosforum.co.uk/forum/viewt ... =89&t=2805 the list is growing.

[Icky]

- Bus Isolators Section

We have swapped the LS373s and LS244s on the Bus Isolator section for SMT. Again they are routed but need cleaning up. My approach at the moment is to just get these components swapped and some semblance of routing done and then the mammoth task starts on the clean up.

Before:

Screenshot 2020-05-22 at 10.08.19.png (362.44 KiB) Viewed 8870 times

SMT changes:

Screenshot 2020-05-22 at 10.07.49.png (273.83 KiB) Viewed 8870 times

[Icky]

- Two 74LSxx Chips to SMT

First is the 74LS07 around the reset area

Before:

Screenshot 2020-05-24 at 09.39.26.png (128.35 KiB) Viewed 8848 times

SMT changes:

Screenshot 2020-05-24 at 09.38.57.png (71.59 KiB) Viewed 8848 times

Second the 74LS02 around the YM2149 and MAX238

Before:

Screenshot 2020-05-24 at 09.40.08.png (270.05 KiB) Viewed 8848 times

SMT changes:

Screenshot 2020-05-24 at 09.40.51.png (232.08 KiB) Viewed 8848 times

[Icky]

- Video Buffers Rework

@exxos reworked the video buffers to work with mono properly. There was a suggestion of using the unused lower bits to improve contrast which has also been taken into account.

Before:

Screenshot 2020-05-24 at 23.29.32.png (111.6 KiB) Viewed 8821 times

After:

Screenshot 2020-05-24 at 23.28.55.png (124.56 KiB) Viewed 8821 times