On 11/1/2020 8:18 PM, Stephen Adolph wrote:
You have to multiply by 2. The input frequency to the processor is 2x
the cpu speed
Stock is 4.9152 MHz.
So yes , but x2.. implication is a pretty fast cpld. I think the xcr
family at 7ns may just do it.
To cut down on required CPU speed,
You have to multiply by 2. The input frequency to the processor is 2x the
cpu speed
Stock is 4.9152 MHz.
So yes , but x2.. implication is a pretty fast cpld. I think the xcr
family at 7ns may just do it.
On Sunday, November 1, 2020, RETRO Innovations
wrote:
> On 11/1/2020 6:19 PM,
On 11/1/2020 6:19 PM, Stephen Adolph wrote:
It would be convenient to stick to multiples of 2.4576MHz so that it
is an easy divisor to create the system clock of 2.4576 MHz.
14.7456 gives gives divisors of
6,4,3,2 for frequencies of:
2.4576 3.6864 4.9152 7.3728
73.728MHz gives divisors
It would be convenient to stick to multiples of 2.4576MHz so that it is an
easy divisor to create the system clock of 2.4576 MHz.
On Sun, Nov 1, 2020 at 6:33 PM Stephen Adolph wrote:
> Yep possible for sure. Worth more investigation.
>
>
>
>
> On Sun, Nov 1, 2020 at 4:25 PM RETRO
Yep possible for sure. Worth more investigation.
On Sun, Nov 1, 2020 at 4:25 PM RETRO Innovations
wrote:
> On 11/1/2020 12:52 PM, Philip Avery wrote:
> > Could Turbo mode be software selectable? Just curious as if you were
> > to enter MVT100 (or VT-100 output with CP/M), you wouldn't be
>
On 11/1/2020 12:52 PM, Philip Avery wrote:
Could Turbo mode be software selectable? Just curious as if you were
to enter MVT100 (or VT-100 output with CP/M), you wouldn't be
constrained by internal M100 LCD.
I was thinking the same thing. A small 44 pin CPLD under the socket,
attached to the
Could Turbo mode be software selectable? Just curious as if you were to
enter MVT100 (or VT-100 output with CP/M), you wouldn't be constrained
by internal M100 LCD.
Philip
On 2/11/2020 12:44 am, Stephen Adolph wrote:
Final story on 8MHz (well final for now!).
Actually, the
Depending on the programmer, you could use an adapter cable from the programmer
to a clip to go directly on the chip. Mike would probably have a more
definative answer. The type of EPROM/EEPROM soldered in could matter as well.
Nov 1, 2020 9:52:58 AM Brian White :
> Some kind of borked re-send
Some kind of borked re-send of a draft. Didn't I already send a proper
version of that?
Anyway disregard the last bit. I was starting to wonder if Mike's board
might work as it's own programming adapter because it includes both the old
and new pinouts. But that was silly and won't work because
Teeprom is for the option rom.
FlexROM_100 or FlexROM_102 is the main rom.
Well really just the 100.
No one really needs the 102 version because for 102 you can just use a
plain 27C256 which is a lot simpler. Just for 102 you want to get some
chipquick or fastchip desoldering alloy to get the
I see 2 reasonable options. Wondering what interest there would be /
reactions to these 2 options.
Option 1. 80C85/4MHz. 1.66x speed increase
- supports classic M100 use and CP/M
- compatible with stock CPU, stock RAM, stock Main ROM, and existing
option ROMs
- CPU adapter board
Final story on 8MHz (well final for now!).
Actually, the processor/ram/keyboard all work at 8MHz. Only one thing I
can see, and it is pretty important, doesn't. The LCD.
The driver chips have to communicate with the CPU, and they are just too
slow to get their data on the bus in time.
So, I
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