GVP Impact Series II HD8+ much slower with TerribleFire 536

[StompinSteve]

Could the large Phase5 version of the 68040.library be based on Commodore's version, expanded with (a lot of) their own code?

[Thomas Richter]

Originally Posted by StompinSteve

Can I deduct from that, that the Phase5 library is a self-contained package with much of the functionality inside it, that is normally divided between 68040.library and mmu.library and/or other files?
I'm just curious why the Phase5 version is so large.

Who knows, nobody has the source, and Ralph refuses to provide information on its interface or working.


What is certain is that it contains both the motorola FPSP and ISP code, (as in every 68040.library), but it also contains the code to drive the MMU (which is a separate library in my setup that is shared between CPU models). It also contains a lot of vendor specific stuff "who knows what". In my operation model, this P5 vendor part is part of the "p5emu.library" which is created by the "P5Init" tool. This tool is not very large in my case, but I do not exactly know how complete my emulation is.



But there is certainly more in it, to drive the interface towards PPC if there is one. Nobody knows how that works, it is undocumented. I don't support the PPCs.

[thebajaguy]

This was something I observed with the RSCP benchmark - in some cases.

There's a fairly hires screen brought up for the benchmark (interlace) and I have watched this interlace screen jiggle up and down one line every so often on some setups during the data reads targeting ChipRAM. I don't see it with <~1.5MB/sec stuff. It was higher-end SCSI performance devices usually.

I know I see on occasion with DMA controllers, and that amounts to the the A2091/A590, GVP Series II interfaces, and the Microbotics HardFrame. I have several of the two former cards. There are others (older) like the Supra and the A2090 in existence, but I shudder if anyone uses them anymore.

Anyway - as noted, I assume it's heavy DMA to ChipRAM that is triggering things, but that's all I know.

Originally Posted by StompinSteve

Sorry, that message was meant for TheBajaGuy.
But I can repeat our "jittery" conversation from page 4" no problem:

The videomode the "funky display / jitter" occurs with is SuperPlus 800x600