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Hi guys,
here is some interesting information i'd like to share:
as You may know, i've assumed that not all cpu's i've used are working stable @35Mhz as some WHDLoad games crashed,
had time to make a deeper investigation - it turned out that all cards are whorking just fine @35Mhz, the issue why some WHDLoad is crashing is SlowRAM!!! seems some games doesn't expect to see expanded Fast + Slow RAM at same time..
So please close MEM1 Jumper - to disable SlowRAM, and You'll be good!
to Update Your card to 35Mhz:
1. remove R4 resistor and place it on R12
2. flash a new firmware (see first post in this thread, or on Gitlab)
3. Close MEM1 Jumper - to disable SlowRAM - now You should be able to start any WHDLoad game without any issues
regards,
- 8 Bit Deams
Thx, good to know. It does seem a little odd to me that WHDLoad would have a problem with that. Isn't the memory at $C00000 the same speed as the other fast mem, i.e. not really 'slow mem'? It is maybe not the speed but perhaps rather the amount of contiguous memory that WHDLoad can get if for some reason it uses this before the 8MB region. Are both regions configured with the same priority?
I would check myself, but I am unable to get to my board since it has been unreachable for >2 months now due to the corona situation. The building where I had it was sealed off when the country was shut down, but I hope that it won't be long until I can get to it again. :)
Edit: Btw, if I reprogram my CPLD, should I use the 1WS or the 2WS version? I assume the 1WS version would be faster, but is it more likely to be unstable?
@demolition - yes, indeed, this SlowRAM has same access speed as FastRAM.. Hmm, will free 2MB by closing MEM2 Jumper and see how it will behave, maybe You are right, and WHDLoad is crashing because more than 8MB are allocated...
About firmwares:
2WS fw has fixed ide waitstates,
1WS fw has variable waitstates, You can install IDETweak software, and add/change Waitstates thru CLI, You can also save/use ide waitstates in startup sequence. Both FWs have MapROM function, this will give additional boost..
(will post detailed instructions here how to install it)