shaunboots wrote:more more info: there was a topic about stuff for trade in sweden and one item sounds just like my ste right down to the motherboard number... 2. Atari 520 STE - Floppy is not really workin (special soldering on the YM chip)
Tos 2.06 - Gem 0.20 - Aes 3.20 - SWE Tos - 2Mb Ram
special: PCB Error Correction, Serial Port Speed Multiplyer (for ex. 3 midi output box)
MB: C300779-001 Rev 5.1 (Atari Corporation 1989)!!!
could it be the same mod and drive problem? the wires on the chips on mine go from pin 19 (lifted from pcb) on the mc8901p to pin 13 on a chip marked goldstar gd74ls164 8947 ROK then from pin 2 to pin 9 on that same chip and then from pin 8 on that chip to pin 22 on the yamaha ym2149f. the goldstar chip seems to be piggybacked onto another chip.. does any of that mean anything to anyone?
still think it may be to do with the dma.. it is c025913-38 ph23-030 9l4 11 that is a faulty one right? and also what does that guy mean by Floppy is not really working( special soldering on the ym chip) ? sorry for all the questions.. i really am trying to do my own research and figure this out but im not getting to far on my own. please help!
shaunboots wrote:thanks zogging hell. my soldering skills are somewhat limited. but i can have a go if i need to. need some practice anyhow. i do have a couple of pc drives but i cant find any way on them to set device number. if i have confirmed the drive works in another Atari it should be safe to assume its not the problem though right?
shaunboots wrote:thanks zogging hell those are some good ideas. gives me something to work with. hadn't really considered the power supply , slightly off voltage can produce strange effects on arcade pcbs so i should have considered it. all the wiring and cables look to be in pretty nice condition. the whole system is pretty nice and clean all over. except for a bit of dust up the back so next step power supply then i dig out the multimeter and give myself a headache. still trying to get my head around the schematic. haha.
quick question about tos, what would happen if you power up with no tos roms in.. could tos be loaded from disk like the early st did? and could i damage anything if i tried?
shaunboots wrote:sorry i forgot to mention that i tried to format a disk. not an empty one though.. it gave a disk read error. i cant remember now if it was disk may be copy protected, or disk may be unusable.. same thing happens when i try to read any of the strange looking files. luckily the data remains intact and on the disk as the disks still work fine in my working st.. dlfrsilver im so sorry to hear about your disk problem . i made a short film as a kid with a program called prism paint, had it saved on a disk that went bad somehow and its gone forever! i was so proud of that thing... i know its unlikely but i do have some old educational games here from when i was young and i think they all still work ok... what was the name of your game? please dont say play spell because i just destroyed it two days ago.. although i may have a backup of that to..
think i need to practice some soldering and maybe even try and get hold of some good dma action also. i figure if i get this guy working a hard drive would be awesome.
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