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Re: Is the Roland LAPC-I MIDI-interface MCB-1 different from the japanese version MCB-2?

Posted on 2020-07-23, 21:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After looking at your pictures and looking at the schematic of the MCB-1, maybe I'm just not looking at it properly, but, are the pictures of how your circuit is now connected? Because it looks like you have pins 8 and 15 of the D connector tied together. And I as of yet (still looking it over) …

Re: Is the Roland LAPC-I MIDI-interface MCB-1 different from the japanese version MCB-2?

Posted on 2020-05-03, 09:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Apparently the chip pinout should be interpreted from above after all and not the bottom, which means I made no mistake. The small "-" sign in one corner of the chip indeed means pin 1 and not VCC-. I follow this schematic of the 74LS05 chip: https://www.circuitspecialists.com/74ls05.html I soldered …

Re: Is the Roland LAPC-I MIDI-interface MCB-1 different from the japanese version MCB-2?

Posted on 2020-05-02, 23:17

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

here is the MCB-1 schematic from my service manual, are you sure you did not make a mistake? https://i.imgur.com/J9AOPFUl.jpg No mistakes from that schematic, but I accidentally reversed the pinout on the inverter chip. I'll fix it soon and report back the results with some pictures. After I have …

Re: Is the Roland LAPC-I MIDI-interface MCB-1 different from the japanese version MCB-2?

Posted on 2020-05-02, 21:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, I'm back after 8 years of abscense. I spent the day finally soldering together a "MCB-1", which had been a dormant project during all this time. My unit includes only the two MIDI-out ports and none of the other outputs. The only components used apart from the sockets were a 74LS05 HEX …

Re: IDE to Compact Flash as MS-DOS boot drive.

Posted on 2012-07-05, 22:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would only have used the flash drive for MS-DOS and not for Windows, to avoid damage from . I've removed it from the motherboard now. It took a lot of force and a pair of pliers, so I'd rather not put it back. I got the error message at boot, right after the memory test, so I don't think it had …

Re: IDE to Compact Flash as MS-DOS boot drive.

Posted on 2012-07-05, 14:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I didn't use FDISK, since the computer had no other disk from which I could run programs. I just booted with the MS-DOS installation disk and it said that no hard drives were recognized. I did not use a CF card with adapter. I used the dedicated IDE Flash Disk in my link from DealExtreme. My …

Re: IDE to Compact Flash as MS-DOS boot drive.

Posted on 2012-07-04, 18:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I couldn't use it with another disk since it has a female connector and my motherboard only has one male IDE-socket. I don't have an IDE cable with a male connector, so the Flash Disk had to be connected directly into the socket on the motherboard with no option of adding a slave device. I tried …

Re: IDE to Compact Flash as MS-DOS boot drive.

Posted on 2012-07-03, 22:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I bought this 256 MB IDE Flash module from Dealextreme in Hong Kong: http://www.dealextreme.com/p/40-pin-ide-disk-on-module-flash-memory-256mb-51804?item=6 Too bad it didn't work with my 486. It's recognized by the BIOS, but the computer gives an error message at boot and refuses to initialize the …

Re: Best Mac OS for late 80:es games?

Posted on 2012-07-03, 22:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just found four pizzabox shaped Macs in a closet at work and I was allowed to bring them home. They were all different models from the age span 1989-1996. Two had Motorola 68K processors and two were PowerPC. The trouble is that they all require an external monitor with the proprietary Apple …

Re: Best Mac OS for late 80:es games?

Posted on 2012-06-19, 13:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm only interested in playing games from the eighties, so wouldn't it be more reasonable to downgrade, or do later operating systems have increased backwards compatibility?

Best Mac OS for late 80:es games?

Posted on 2012-06-19, 09:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a Powerbook 540 (the black & white version) that came with System 7.5 pre-installed. Is this a good combination of OS and computer if I want to play classic Mac-games, like Shadowgate, Dark Castle, Ancient Art of War, etc? Would it be better if I downgraded to an earlier version of System 7 …

Re: IDE to Compact Flash as MS-DOS boot drive.

Posted on 2012-05-23, 16:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Will the Ontrack Dynamic Drive Overlay software use precious kilobytes of conventional memory? I already have an IDE controller in the computer that could let me access larger hard drives, but I disabled its internal BIOS since it needed some RAM to work. I think I'll try with a 256 MB Compact Flash …

Re: need help about installing mac os x phanter over tiger (for classic and old mac os x game)

Posted on 2012-05-22, 22:02

in Macintosh Emulation

in Macintosh Emulation

You could dual boot with OS 9.2 and OS X. It works much better that way, since using the Classic environment makes some games run very slow. In that case it's important that you install OS 9.2 first and then OS X, or OS 9.2 won't be able to detect your hard drive partitions. By the way, are you …

IDE to Compact Flash as MS-DOS boot drive.

Posted on 2012-05-22, 21:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm thinking of fitting my DOS-computer with an "SSD" consisting of an IDE to Compact Flash adapter with a CF memory card in it. The problem is that the computer refuses to boot from hard drives larger than slightly above 500 MB, no matter the size of the boot partition. I haven't been able to …

Imac G3 with an SSD won't boot OS X 10.4 Tiger.

Posted on 2012-05-08, 22:12

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found an Imac G3 that no one else wanted and took it home to see how far I could upgrade it. It is the strawberry colored kind with a slot-loaded DVD and a 400 MHz processor. http://img62.imageshack.us/img62/4623/dsc03306b.th.jpg I installed 512 MB of RAM and replaced the original 10 GB hard drive …

Re: High- and Low-density RAM

Posted on 2012-05-05, 18:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Perhaps I was to quick in judging the V-data RAM. The motherboard of my Pentium 3 has a i440BX chipset and according to point number 3 in the quote below there are some types of quality RAM that it won't recognize properly. I suppose it's because the chips are of the same kind found on Low Density …

Re: High- and Low-density RAM

Posted on 2012-05-05, 17:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is another post that explains the difference between high- and low density RAM. http://reviews.ebay.com/High-or-Low-density-Does-it-matter?ugid=10000000002086216 I found I had a pair of 256MB modules of SDRAM that were only detected as 128MB by my Pentium III, although they were detected as …

Re: High- and Low-density RAM

Posted on 2012-05-02, 10:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm referring to what's written here, among other places: http://reviews.ebay.com/Myth-Low-Density-vs-High-Density-memory-modules?ugid=10000000001236178 It mentions that High Density SDRAM is much slower than Low Density RAM. I assume they mean that it's the halved bus width (4 bits) of the …

High- and Low-density RAM

Posted on 2012-05-02, 00:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There seem to be sticks of RAM around where the memory bus is halved to 4 bits instead of the regular 8 bits. The ones with less bits are called High Density RAM and are slower and inferior to the ones with more bits called Low Density RAM. I went through my collection of SDRAM and fortunately …

Re: Two new retro PC's coming my way

Posted on 2012-04-25, 18:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Perhaps you can make the IBM computer recognize the RAM by soldering together the last four detection pins in the same order as on the proprietary SIMMs. There should be four solder pads at the edge of the SIMM that represent the four pins. At least I could make my own proprietary RAM for my HP …

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