Clyde wrote:The last ROM version I'm aware of is v1.57, a few years ago Yamaha still would provide them for purchase with a 6-8 week delivery time in the US (as apparently they were writing to a ROM per each order and it was done at YamahaJP and then shipped to YamahaUS, then shipped to the purchaser. The SY77 chip set I bought several years ago averaged around $85.00 US per ROM, I don't think they are still doing this service, but I'm not positive.
To avoid disappointment, I’m assuming the ROMs are no longer obtainable from Yamaha, but I’ll maybe make some enquiries with them.
There are some v1.57 data files floating around and if you have access to an EPROM writer you could make one with v 1.57 on it.
Thanks; I know about those, but if I’m not mistaken, the problem is that the upgrade to v1.57 also requires new ROM in the CPU and therefore a new chip that has been burned accordingly? And I have never seen anything that suggests that anyone managed to do that.
I really think getting v 1.57 ROM done is the easy part of this process, the real issue is someone finally putting together a working 5mb ROM expansion at reasonable cost and that would work in conjunction with the half mb of factory ram and up to five SYEMB05 boards so you could end up with 8mb total (just like the Musitronics version did).
Are the SYEMBs required to reach the maximum (well, maximum without even larger changes to the internal circuitry and code) capacity of 8 MB; in other words, could 8 MB be made addressable by a single board? I also wonder whether the 5 MB expansion could be used on its own without SYEMBs? If I had suitable ROMs, I would definitely buy such an expansion if I could. In the meantime, I hope to be able to order at least a few SYEMBs from Sector101 soon. Three megabytes should keep me going fairly well, so I’m not too disappointed by the fact that I have an older SY99.
Musitronics told me they no longer had any and would not be making any more of them. So there have been several threads and interest shown, but due to various issues and/or personal situations, it has never come to a completed project. I'm still hoping that it gets done one of these days
Yes, it’s definitely a shame that they no longer sell the RAM or sample expansions. If they did, I’d buy both as soon as I were able to.
Oh well! Hopefully the clever people here will figure something out eventually. I’d certainly be interested in any updates from any of the members who previously discussed the necessary technology, however small.