Dynamic Engineering Portable PDS RAM Card

[campbellashe]

This is the next gen board:

GitHub - 2tf2294x4g-maker/MacintoshPortable8MB_RAM: Mac Portable Variable 4 or 8MB RAM expansion card — all-5V, AS6C8008 SRAM, ATF1502ASL CPLD. Expands to 9MB total (system max).

Mac Portable Variable 4 or 8MB RAM expansion card — all-5V, AS6C8008 SRAM, ATF1502ASL CPLD. Expands to 9MB total (system max). - 2tf2294x4g-maker/MacintoshPortable8MB_RAM

github.com

 

[trag]

This is the next gen board:

GitHub - 2tf2294x4g-maker/MacintoshPortable8MB_RAM: Mac Portable Variable 4 or 8MB RAM expansion card — all-5V, AS6C8008 SRAM, ATF1502ASL CPLD. Expands to 9MB total (system max).

Mac Portable Variable 4 or 8MB RAM expansion card — all-5V, AS6C8008 SRAM, ATF1502ASL CPLD. Expands to 9MB total (system max). - 2tf2294x4g-maker/MacintoshPortable8MB_RAM

github.com

I have not been following in detail. Have you looked at addressing/solving the loss of performance when the address strobe signal is used for RAM greater than 5 MB (4 MB?)? Apologies if I'm mistaken about that. I think I saw it in one of @JDW 's videos.

 

[campbellashe]

I don't have an elegant way yet.... I was thinking of jumping on the software side of things with the previously proposed use of an INIT to create a sleep hook to poke $FC0200 on wake. My understanding is just with wake from sleep this occurs? and is related to the logic board side...

My goals was to validate the board and then see if I could work on the INIT once I get it working.

This is the idea: @David Cook

https://tinkerdifferent.com/threads/bluescsi-on-macintosh-portable.2764/post-44205

I'm not sure if others have played with the software side to fix this problem.

 

[trag]

I don't have an elegant way yet.... I was thinking of jumping on the software side of things with the previously proposed use of an INIT to create a sleep hook to poke $FC0200 on wake. My understanding is just with wake from sleep this occurs? and is related to the logic board side...

My goals was to validate the board and then see if I could work on the INIT once I get it working.

This is the idea: @David Cook

https://tinkerdifferent.com/threads/bluescsi-on-macintosh-portable.2764/post-44205

I'm not sure if others have played with the software side to fix this problem.

Thank you. I don't know the cause of the issue. Hearing that it existed was the extent of my knowledge. I appreciate the extra detail you provided.

 

[Froggy814]

You could ask @SuperSVGA but I don't know if he's willing to relinquish that knowledge.

 

[David Cook]

I don't have an elegant way yet.... I was thinking of jumping on the software side of things with the previously proposed use of an INIT to create a sleep hook to poke $FC0200 on wake. My understanding is just with wake from sleep this occurs? and is related to the logic board side...

My goals was to validate the board and then see if I could work on the INIT once I get it working.

This is the idea: @David Cook

https://tinkerdifferent.com/threads/bluescsi-on-macintosh-portable.2764/post-44205

I'm not sure if others have played with the software side to fix this problem.

I added that to an unreleased version of my Quiet Portable init. JDW tested it and said it made no difference. If you build a spare memory board for me (which I will pay for), I'd be happy to experiment further with getting it working.

 

[campbellashe]

Let me get my board working..the version 2. I’m working on trying to write an INIT myself. Will see how my skills are.

 

[David Cook]

Let me get my board working..the version 2. I’m working on trying to write an INIT myself. Will see how my skills are.

Understood. Reach out to me if you need help.