MINIMIG HARDWARE COMPATIBILITY & NEW TURBO MODE!

[yaqube]

Monitors:

1. EIZO FlexScan L568: syncs to 50Hz in PAL mode, sampling clock can be set to 910 pixels per line in PAL and NTSC mode

2. EIZO FlexScan S1931: syncs to 50Hz in PAL mode, sampling clock can't be set to 910 pixels per line either in PAL or NTSC mode.

MMC/SD cards which work:

Kingston SD 1GB
Kingston SD 50X 2GB
SanDisk Ultra II 1GB
SanDisk MMC 1GB (this card is noticeably slower than the above ones)

MMC/SD cards which don't work:

Kingston MMC 128MB (this card is not detected by Minimig although it works in a card reader and in my camera).

[yaqube]

@ulysses31

Have you tried the built which defaults to NTSC? You shouldn't have any troubles with it as you say the previous release works with your monitor without a problem.

[yaqube]

@Darrin

The NTSC mode has the same sync frequencies as standard 60Hz 640x480 VGA mode which is mandatory for every PC monitor (I know almost nothing about Apple's monitors). It should work.

[yaqube]

@Sascha

I haven't changed anything to disk dma slot allocation. Dennis used 4 slots for disk dma transfer, Amiga uses 3. The disk data transfer speed is quite hard to estimate since many different things affect it. Disabling PIC's debug info speeds the tranfer a little. I have also experimented with 6 transfer slots and speed gain was noticeable but some games had problems with running.

I have also modified the FPGA interface to the CPU and got it running synchronously with 28 MHz clock. SysInfo reports 3.00 speed of A600. I have also run the CPU with asynchronous interface (more cycles required for synchronization) to estimate maximum operational frequency. Mine (20 MHz part) seems to work correctly with ~39 MHz (5.5x7.09MHz) but reported speed by SysInfo is 3.06 times A600. I think I will stick to 28 MHz synchronous design. Memory access speed is a drawback.

[yaqube]

@Sascha

Please let me know the players and conditions when you experienced playback speed-up.

The PIC's EEPROM is specified for 1,000,000 write cycles. I only store the data when exiting particular submenu and  required value is different than already stored. Don't worry about wear factor.

I'm planing to change CPU speed by the OSD menu. The settings won't be affected by reset.

[yaqube]

To achieve undistorted picture your monitor must be able to set sampling clock to 910 pixels per line. Not every monitor is capable of doing this. I have got one which can accomodate to Amiga display mode and there is no distortion and the scrolling is smooth.