noticed that its keyboard features "Shift Lock" and "Restore" keys.
further (apart, of course, from the memory management stuff)?
> noticed that its keyboard features "Shift Lock" and "Restore" keys.
> further (apart, of course, from the memory management stuff)?
Thanks, I downloaded the images from here.
If you have a monitor that can accept NTSC composite video you're all set!
> If you have a monitor that can accept NTSC composite video you're all set!
Wow. That is awesome. I will try that over the weekend!
ugly, PAL from the C64 is much better.
Restore clears the screen and shows the READY. prompt just like on the C64.
(third) Shift key. No locking. This of course was expected.
the character data sits in the KERNAL and space was tight there.
That's great! Glad it worked for you.
I have a working prototype on a breadboard circuit that uses a 6-way resetable latch to control the upper 5 address lines of a 1mb eprom, which is 31 ultimax images plus the menu system. The setting of the latch is gated using one of the i/o lines on the 64 cartridge port which, on the max is the /exram line. I completed the menu system which seems to work to I just need to fabricate some pcb's which, as I've never done it before, is kind of where I ground to a halt in the spring.
Now winter is setting in, i'd like to pick it up again. Anyone interested in co-operating to get it finished?
I have one, I'll put it somewhere as soon as I get back to the home office.
> never done it before, is kind of where I ground to a halt in the spring.
require at least one additional chip to managed.
> interested in co-operating to get it finished?
> require at least one additional chip to managed.
/exram free for it's intended purpose?
>> interested in co-operating to get it finished?
Will Max support something bigger than 6116? I ordered a few cheap 32k sram chips in sdip that don't take much room... Even if we cant use the whole capacity.
>> require at least one additional chip to managed.
> Yeah, I had kind of excluded the MAX basic from the list for exactly that reason. As you know, the cartridge port on the Max is subtely different and you don't have the same select lines exposed so it seemed easiest to use the /exram line to gate the latch. Maybe you have an idea for how we can use alternative lines that exposed that will leave the /exram free for it's intended purpose?
> The only 3 other Max compatible cartridges I was aware of that are not on the list are Max Basic, Pinball & Slalom where the last 2 have ROM's in the /ROML bank.
>>> interested in co-operating to get it finished?
expect the memory to be divided into blocks of 4096 addresses.
to see how many cycles are possible.
same address three times in a row (1 read and 2 writes).
> Will Max support something bigger than 6116? I ordered a few cheap 32k sram chips in sdip that don't take much room... Even if we cant use the whole capacity.
Short answer: No. The /EXRAM line is active only at $0800-$0FFF.
of space in the cartridge unless you go for SMD.
to handle more, as I explained to Steve.
> Are the I/O1 or I/O2 signals available on the Max cartridge port?
by SP pin form the CIA.
> /exram free for it's intended purpose?
does; if not, as a last resort you can cascade two 4-bit counters.
I think the above concept should be sufficient for all your needs.
> does; if not, as a last resort you can cascade two 4-bit counters.
>> Will Max support something bigger than 6116? I ordered a few cheap 32k sram chips in sdip that don't take much room... Even if we cant use the whole capacity.
> Short answer: No. The /EXRAM line is active only at $0800-$0FFF.
/EXRAM may be active up to $3FFF.