prime
Experienced Member
Whilst we're on the subject of the Sanyo, does anyone happen to have the schematics for the machine ? or documentation of the hacks required to upgrade beyond 256K ?
Cheers.
Phill.
Cheers.
Phill.
Whilst we're on the subject of the Sanyo, does anyone happen to have the schematics for the machine ? or documentation of the hacks required to upgrade beyond 256K ?
Cheers.
Phill.
I'd be happy to buy the magazines. Is paypal ok?
Also, I have the schematics from the sams photofact in pdf if anyone wants them.
E-mail me at bigbadbrad at gmail for setting up either of these!
What are the headlines of the magazines?
Yep in most systems that use 4164s, you can use 41256s as drop in replacements, as long as the extra address line (pin1 IIRC) is pulled either high or low so that it is stable. I believe most 41256 chips do this internally. The only case where this may not work is where the target system expects 4164s with a 128 cycle refresh, as all 41256s are 256 cycle refresh.I used
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_41398_-1
Which work fine. They are actually higher capacity than you require but I installed them in my machine to bring it to 256 and they work fine.
I'm going to pdf the page from the manual if you need them. I am also going to pdf the soft sector magazine than instructs a larger 512k upgrade and palce it on my site
Ok 4164 is the standard upgrade chip.
If you are interested in going beyond 256k there is a techniqure in the softsector magazine on my website you can checkout. Apparently you can even go beyond 512K as several add on boards were available at one time to do so.
Anyways check out:
www.eriscreations.com/sanyo/
here are the 2 pages from the manual about the standard upgrade to 256k from 128k
View attachment 11088
&
View attachment 11089
I believe 768k was the largest RAM upgrade but most had a switch to bring the available ram to 360k or somewhere in there for programs that had problems with the excess memory and while it's been a long time since I had a 555-2 I believe a memory manager had to be run with the Sanyo version MS-DOS to make use of the 768k. I got rid of my Sanyo in about 1993 before I left central IL when the base there closed. I had another given to me since, around 2000, and I ebay'd that to someone else since it had no DOS disks. My original had a lot of upgrades I did starting with the power supply upgrade from Soft Sector then I added a CGA video board then upgraded the memory with a kit with a switch, then went to 2 800k floppy drives and the aftermarket DOS that supported them, then I built an external enclosure and added two more floppy drives and I also added a serial board and modified a PC joystick to work with the weird Apple style DIP plugin. Eventually I ran my first BBS on it using Fido BBS and since programs were small then I had a couple of file areas, all on floppy. I would swap the floppies each week giving the users a different set of files to download. For the time period I had it the machine was OK but I quickly lost interest when I got a clone AT machine. It ran the BBS only for about 18 months then I was given another clone 286 and changed the BBS over to the clone and sold the Sanyo with all the manuals, software and hardware. I think the biggest annoyance on the machine was the lack of the ALT key and the reset being so easy to hit on the side of the keyboard.
That is cool. I have the CGA upgrade card in mine now. Wanted it back in the 80's but it's cool to see the sanyo running some IBM Graphics, even 16 colours on the low res Sierra Kings Quest.