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Author Topic: Internal memory expansion (Read 51647 times)

Offline Saint

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Re: Internal memory expansion
« Reply #150 on: 2014.February.19. 10:02:31 »
Quote from: Zozosoft
First one installed to Szalai56 machine :ds_icon_cheesygrin:
Awesome! Great to see my little boards getting fitted... :ds_icon_cheesygrin:

Offline Zozosoft

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Re: Internal memory expansion
« Reply #151 on: 2014.February.25. 00:22:59 »
Next:1M added to my machine :-D
Not too easy, because this machine has a lot of hacks :oops: : 6Mhz SMD Turbo Card, 7.12 Mhz turbo, switchable color/mono composite video, internal speaker mute switch, external keyboard connector for rewired PC keyboard (20 years ago there was no new membrane :-( currently installed brand new from RWAP :-) ) Miles of wires :lol:
And now adding 10Mhz turbo :-D
« Last Edit: 2014.February.25. 13:01:37 by szipucsu »

Offline Saint

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Re: Internal memory expansion
« Reply #152 on: 2014.February.25. 10:19:12 »
10Mhz 1.0625MB Enterprise. Very nice. :ds_icon_cheesygrin:

You must tell us how to modify the Enterprise for 10Mhz, as I feel I might have to do this for my Arabic Enterprise once I'm happy it's all working properly (replacing all the caps at the moment!).

Offline Z80System

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Re: Internal memory expansion
« Reply #153 on: 2014.February.25. 10:29:09 »
If a game would load all of the one megabyte,

for what time would it load ?
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Offline Saint

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Re: Internal memory expansion
« Reply #154 on: 2014.February.25. 10:38:01 »
Quote from: Z80System
If a game would load all of the one megabyte,

for what time would it load ?
It wont affect floppy load time (so it's still a long time!), but with an SD / CF interface, it should only take perhaps 2-3 seconds.

Offline Zozosoft

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Re: Internal memory expansion
« Reply #155 on: 2014.February.25. 10:59:58 »
Quote from: Saint
You must tell us how to modify the Enterprise for 10Mhz, as I feel I might have to do this for my Arabic Enterprise once I'm happy it's all working properly (replacing all the caps at the moment!).
Ok I will start overclocking topic :-)

Offline szipucsu

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Re: Internal memory expansion
« Reply #156 on: 2014.February.25. 13:05:54 »
Quote from: Z80System
If a game would load all of the one megabyte,

for what time would it load ?
Using tape it would take ages. :D
About one or two hours I think. You would be very sad if you accidentally pressed reset after an hour or the loading stopped with a cassette CRC error right before the end of loading. :D
SOUND SOURCE 3,STYLE 16,LEFT 16,RIGHT 64,SYNC 2
SOUND SOURCE 2,STYLE 128,PITCH 25.2,SYNC 2
SOUND PITCH 25,SYNC 2
Videos

Offline geco

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Re: Internal memory expansion
« Reply #157 on: 2014.February.25. 13:20:27 »
3840 seconds at 2400 baud, calculated with approx 1.5 second breaks between two 4Kb blocks :D
It would take only 64 minutes, only some coffee breaks :D
« Last Edit: 2014.February.25. 17:49:00 by szipucsu »

Offline Z80System

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Re: Internal memory expansion
« Reply #158 on: 2014.February.25. 13:33:02 »
I thought of a floppy or HDD scenario. A normal game can take 5-15 seconds from floppy/HDD, then a 1MB game probably can take a minute, cannot it ?

The new SD solution is not a reality just now, and the current solution is limited to Z80 speed. (Ooooops, Does the 10MHz Z80 load 2.5 times faster than the original ? :))
« Last Edit: 2014.February.25. 17:50:41 by szipucsu »
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Offline Zozosoft

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Re: Internal memory expansion
« Reply #159 on: 2014.February.27. 00:07:27 »
Now I'm running the Small Demo for least two hours at my 10MHz machine, with the 1MB expansion. And it is looks stable :ds_icon_cheesygrin: previously only tested with little BASIC programs.

The digi sound samples are very funny when played at 10MHz :-) Dave generated musics still music because the player program synchronized with the 50Hz video IRQ, just playing in higher octave :lol:

Offline Z80System

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Re: Internal memory expansion
« Reply #160 on: 2014.February.27. 09:22:27 »
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just playing in higher octave 

How can the 10MHz Z80 clock influent the dave frequencies ? Is there a hardware incompatibility betwen the DAVE and 10MHz solution ?
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Offline Zozosoft

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Re: Internal memory expansion
« Reply #161 on: 2014.February.27. 09:36:20 »
Quote from: Z80System
How can the 10MHz Z80 clock influent the dave frequencies ? Is there a hardware incompatibility betwen the DAVE and 10MHz solution ?
Dave always running on System Clock (2xZ80 speed), if you raise the system speed then Dave also running faster, sound frequencies will be higher.
For the 6MHz machine (12MHz System Clock) can be adjusted the Dave on the port 191 (BFh), then it is can generate same sound frequencies as the original 4MHz (8MHz System Clock) machines.

But in the future programs this is can be handled by software, just need recalculate which sound frequencies sent to Dave.

Offline Z80System

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Re: Internal memory expansion
« Reply #162 on: 2014.February.27. 09:44:43 »
Quote
But in the future programs this is can be handled by software, just need recalculate which sound frequencies sent to Dave.
I think the future programs are not the problem. The existing programs are the problem ...

At 10MHz probably many program will be better playable simply because of the speed ... 3D programs and such ... any program that was slow on 4 MHz ... but the sound will be almost broken ...
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Offline Zozosoft

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Re: Internal memory expansion
« Reply #163 on: 2014.February.27. 09:56:17 »
Quote from: Z80System
but the sound will be almost broken ...
Not broken just different. Sometimes very funny :-) You can easy try it in a emulator.

Offline jltursan

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Re: Internal memory expansion
« Reply #164 on: 2014.February.28. 19:36:07 »
Maybe 10Mhz could help the machine to emulate other architectures like MSX. CPC & Spectrum soft are in some way very close to EP; but being pattern based instead bitmapped makes MSX video is a bit different.